The transition from high school to university life is a critical time for change, often accompanied by the adoption of negative lifestyle habits including unhealthy nutrition. The purpose of this longitudinal study was to identify sex-specific changes in dietary intake and diet quality, and associated changes in body weight and composition during first-year university.
Three-hundred and one students (n = 229 females) completed food frequency questionnaires, and had their body weight, body composition, waist and hip circumference measured at the beginning and end of first-year university. Repeated-measures ANOVAs with covariate adjustments were used with variables for sex (between group) and time (within group) to assess these changes.
Students gained body weight and fat during the year (p<0.001). Body mass Index (BMI) also significantly increased (p = 0.032). Males gained more weight (Male:3.8 kg; Female:1.8 kg), fat mass (Male:2.7 kg; Female:1.5 kg), lean mass (Male:1.1 kg; Female:0.3 kg) and BMI (Male:1.2 kg/m2; Female:0.7 kg/m2; p≤0.001 for interactions), and had greater increases in waist circumference (Male:2.7 cm; Female:1.1 cm) and waist:hip ratio (Male:0.02; Female:0.004; p<0.05 for interactions) than females. Energy intake remained the same over the year in both sexes, accompanied by an increase in alcohol (ethanol) in both sexes but more so in males than females (p = 0.011 interaction). Diet quality decreased, characterized by a reduced intake of healthy foods/beverages (p<0.05) in both sexes such as yogurt, cheese, oatmeal, breads, rice, pasta, vegetables, green salad, fruits, steak, fish, nuts and milk, and an increased consumption of unhealthy foods and beverages (p<0.05) such as donuts/cakes, fried chicken, beer and liquor. Significant interactions between sexes indicated that males displayed a more adverse and lower quality eating pattern which included greater intakes of donuts/cakes, fried chicken, beer and liquor, as well as decreased intakes of eggs and vegetables compared to females. Lastly, some dietary intake changes significantly correlated with fat mass and waist circumference change indicating that poor dietary choices were associated with increased adiposity.
Our study demonstrated that during first-year university, both male and female students undergo unfavorable changes in nutrition and body weight/composition that significantly differ between sexes, with males showing more adverse changes. Our results can be used to inform effective sex-specific strategies and interventions to improve dietary habits during the transition to university life.
Citation: Beaudry KM, Ludwa IA, Thomas AM, Ward WE, Falk B, Josse AR (2019) First-year university is associated with greater body weight, body composition and adverse dietary changes in males than females. PLoS ONE 14(7): e0218554. https://doi.org/10.1371/journal.pone.0218554
Editor: David Meyre, McMaster University, CANADA
Received: February 1, 2019; Accepted: June 4, 2019; Published: July 3, 2019
Copyright: © 2019 Beaudry et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Data Availability: The data underlying the results presented in the study are available via the DOI: https://doi.org/10.5683/SP2/6QNBRU, with restricted access. Data access requests may be made to York University's Research Data Management Librarian, Ms. Minglu Wang; Tel: (416)736-2100 ex. 40075. Email: email@example.com.
Funding: Funding was provided by an unrestricted research grant to ARJ from Brock University.
Competing interests: The authors have declared that no competing interests exist.
The worldwide rates of overweight and obesity are increasing . According to a 2015 report, approximately 604 million adults or 12% of the population were considered obese worldwide, with North America having the highest prevalence of obesity . When looking at patterns of body weight change over the lifespan, a critical time for weight gain appears to be in later adolescence and early adulthood [3–5]. During adolescence, patterns of sex-specific weight gain also emerge such that males tend to gain more lean mass while females gain more fat mass . This time coincides with the transition from secondary school to university or college. During this time, individuals are beginning to settle into their life routines and are adopting lifestyle habits that are likely to be sustained into later adulthood [7, 8]. These lifestyle habits may lead to weight and fat gain which could have negative long-term health implications [7–12]. In most [3, 5, 13–15] but not all  studies, males have been shown to gain more body weight than females. Little is known about the composition of the weight gained , and studies directly comparing this in males versus females are scarce. Nevertheless, adolescent and young adult weight gain is highly linked to overweight and obesity in later adulthood . Thus, during critical time periods, like the transition from high school to university life, it is important to identify, characterize and assess the impact of certain determinants that may contribute to obesity and negatively impact long-term overall health and wellbeing in males and females [18, 19]. This may help combat the rising rates of adult obesity and associated co-morbidities [7, 20, 21].
The etiology of obesity is multifactorial , and there are several features which influence the habits of students in first-year university that can lead to weight gain and negative body composition change [23, 24]. One of these is dietary intake. Excessive consumption of calorie-dense foods, poor meal consumption patterns, increased dieting, and disordered eating have all been associated with undergraduate weight gain [25–27]. However, nutrition-related findings, particularly in North America, are conflicting [28–31]. For example, two Canadian studies found no significant change in energy and nutrient intake over the course of first-year university in males  and females , while two studies in female first-year students reported significant decreases in nutritional intake, despite increases in body weight [29, 31].
Beyond energy and nutrient intake, it is also important to investigate changes in dietary patterns and diet quality. Dietary patterns of healthy or unhealthy eating, rather than intakes of individual foods or nutrients, are more closely linked to chronic disease risk [32–34]. Diet quality is used to describe how well an individual’s diet conforms to dietary recommendations, thereby providing appropriate amounts of all essential nutrients . Diet quality in both males and females has been shown to decrease over the course of first-year university, and is characterized by a general decrease in the consumption of fruits, vegetables and whole grains, and an increase in the consumption of foods containing high levels of sodium, sugar and saturated fat [4, 24, 36, 37]. There have also been instances of increased alcohol intake over the course of first-year university in both male and female students which is also indicative of a decrease in overall diet quality [24, 29, 37, 38]. These negative dietary changes are associated with adverse health consequences . However, none of these studies assessed changes in nutrient intake and diet quality along with changes in body composition, and none explored these changes between the sexes. Therefore, the objective of our study was to examine sex-specific changes in body weight, body composition, waist/hip circumference, dietary intake and diet quality during first-year university. Our a priori hypotheses were: a) students will experience negative physical changes including increases in body weight and fat mass. Sex-specific differences in patterns of weight gain and body composition change will emerge; b) dietary intake will change and diet quality will decrease throughout the academic year characterized by a reduced consumption of healthy foods and beverages and an increased consumption of unhealthy foods and beverages; c) the change in healthy and unhealthy food consumption will differ between males and females; and d) adverse changes in nutrition will be associated with negative sex-specific physical changes.
Materials and methods
Study design and participants
A sample of incoming first-year male and female students were recruited though posters, flyers, information booths at university welcome week events, the media and word of mouth. Eligibility criteria included: age 17–20 years; attendance at Brock University (St. Catharines, Ontario, Canada), and no previous college or university experience. Written informed consent was obtained directly from the participants. The study was cleared by Brock University’s Bioscience Research Ethics Board (REB #13–297).
Two cohorts of participants (2014–2015 and 2015–2016) were followed longitudinally with data collected at 2 study visits: the beginning of their first-year (August/September) and the end of their first-year (March/April). Data collected included anthropometrics (height, weight, waist and hip circumference), body composition and dietary intake.
Anthropometrics and body composition.
Body weight, body fat percent, lean body mass and fat mass were assessed using bioelectric impedance analysis (BIA; InBody520 bioelectrical impedance analysis system; Biospace Co. Inc. Los Angeles, CA, USA) with no shoes and light clothing. Participants were asked to arrive at the laboratory during the morning hours (0800–1100) after an overnight fast, and to refrain from exercise or alcohol consumption for 24 hours and 12 hours, respectively, prior to body composition analysis. Care was taken to minimize the effects of hydration status on our measures by having participants consume 500 ml of water upon arrival to the laboratory. After 30 min, they were asked to void and then BIA measurements were taken. Height was measured with a stadiometer to the nearest 0.1 cm with no shoes and light clothing, and body mass index (BMI) was calculated. Waist and hip circumference (cm) were measured using a standard, retractable, non-metallic tape measure placed at the waist at the level of the umbilicus, and across the largest part of the buttocks and below the iliac crest, respectively. Anthropometric measurements were done in duplicate and then averaged. Waist to hip ratio was calculated. The same researcher carried out the same measurements on the same subjects at the beginning and end of the study.
Dietary intake and diet quality.
Dietary intake and diet quality were assessed using a food frequency questionnaire (FFQ; Block 2014, NutritionQuest, Berkeley, CA, USA). The FFQ included 127 commonly consumed food and beverage items, and assessed intakes retrospectively over 6 months . FFQs were administered immediately upon starting university in August/September (results of which would reflect, as best as possible, intakes prior to entering university), and again, just before finishing first year in March/April (which would reflect intakes during first year). All data from the FFQs were analyzed by NutritionQuest using a Canadian nutrient database. For the diet quality assessment, dichotomous (i.e. healthy vs. unhealthy) categories of foods/beverages were created based on Canada’s Food Guide , the United States and Canada Healthy Eating Index [41, 42] and meta-analyses that assessed specific dietary factors/foods and chronic disease risk [43, 44].
All data were stratified by sex before analysis. For the body composition/anthropometry analyses, at each timepoint, outlying data points were identified and individually checked to determine if they were true outliers (i.e. participants who were tall, large etc., compared to the general distribution of our data) or outliers due to a data entry or measurement error. Data errors were subsequently corrected, and all other outliers were left in the dataset. For the nutrient and diet analyses, at each timepoint, female data were removed if total energy intake was calculated to be <500 kcals or >3500 kcals, (as was done in ). Similarly, male data were removed if energy intake was <1000 kcals and >4000 kcals. Differences in anthropometrics, body composition and dietary intake from the beginning and end of first-year university were determined using a two-way repeated measures analysis of variance (RMANOVA) with sex being the between-subject variable and time being the within-subject variable. Partial eta-squared values were calculated from the RMANOVA as a measure of effect size, where ~0.02 is considered a small effect, ~0.13 is a medium effect and ~ 0.26 is a large effect . Several covariates that may have affected our outcomes were assessed separately in each RMANOVA model. These included: 3 levels of physical activity (light, moderate and vigorous; data reported elsewhere ) cohort (to account for potential clustering bias), faculty of study (Health Sciences, Arts, Business or Math/Science), and living arrangement (in residence, living with friends off campus or living at home). Covariates were retained in the models if their interaction with a main effect was significant, otherwise reduced models were presented. Plausible associations between dietary and body composition variables and between select dietary variables were determined by assessing 2-tailed Pearson correlations in males and females separately as well as in subgroups of those that gained body weight within each sex. Diet quality was assessed qualitatively by noting significant differences in intakes of foods (expressed as g/d) grouped into categories of healthy or unhealthy, over time and between sexes. Decreases in healthy foods and increases in unhealthy foods indicate an overall pattern of decreased diet quality. In addition, differences in intakes of these foods/beverages between sexes reflect differential changes in diet quality and eating patterns throughout the year. Statistical analyses were performed using SPSS (version 25, Chicago, Illinois, USA). P≤0.05 were considered statistically significant and those at 0.05<p <0.10 were reported as trends. We did not correct for multiple testing as done in .
A total of 1231 incoming first year students (380 males and 851 females) expressed interest in the study. Of those, 364 students completed the first study visit in September. 301 first-year students returned to complete the second study visit in March (83% retention rate). Reasons for dropping out were unknown but may relate to the fact that follow-up assessments were conducted around final exams (in March/April).
Of the 301 participants, 24% were male (n = 72) and 76% were female (n = 229). Seventy two percent of students lived in residence (n = 218), 22% of students lived at home (n = 65) and 6% lived in a student house off campus (n = 17). Forty five percent of students were in the faculty of Applied Health Sciences (n = 136), 10% were in the faculty of Business (n = 29), 12% were in the faculty of Mathematics and Science (n = 36), 14% were in Education (n = 41), 17% were in Social Sciences (n = 50) and 3% were in Humanities (n = 9). Seventy four percent of the sample were Caucasian (n = 224), 15% were Asian (n = 44), 6% were African American (n = 17), 3% were Hispanic (n = 8) and the remaining 2% were of other ethnicities not stated above (n = 8).
Anthropometrics and body composition
Table 1 displays the anthropometric and body composition results from the beginning and end of first-year university, separated and compared by sex. Both sexes gained body weight and fat mass and increased their waist:hip ratio. Males gained significantly more weight than females (interaction: p<0.001), increased their BMI, waist circumference and waist:hip ratio more than females (interactions: p = 0.001; 0.014; 0.046, respectively), gained more fat mass than females (interaction: p = 0.001), as well as more lean mass than females (interaction: p<0.001). In addition, the quality of weight gain was also sex-specific in that the weight gained by males was composed of 29% lean mass (71% fat), while the weight gained by females was 17% lean mass (83% fat). Height was unchanged. According to their mean BMI at the end of first-year (>25 kg/m2), males were now classified as ‘overweight’.
Table 2 displays select nutrient intakes of both males and females from the beginning to end of first-year university. After covariate adjustment, total energy intake was not significantly different over the year or between sexes. Iron intake was significantly different between sexes (interaction: p = 0.009) and alcohol intake increased over the year in both sexes, but more so in males (interaction: p = 0.011). For all nutrients, males had greater intakes which was likely reflective of their greater total energy intakes.
We analyzed the FFQ data by assessing the amount of a food consumed per day, expressed as g/d. This measurement considers the frequency of consumption of a food (e.g. eating eggs 1 time per day or 1 to 3 times per week, etc.), as well as the amount consumed on each occasion (e.g. 2 eggs at one time). Tables 3 and 4 show these values for various foods that were designated as either part of a healthy diet (Table 3) or an unhealthy diet (Table 4). In Table 3, there were significant decreases in both sexes in the consumption of healthy foods including yogurt, cheese, oatmeal, breads, rice, pasta, vegetables, green salad, fruit, steak, fish, nuts and milk. Significant interactions were seen for eggs, vegetables (total) and starchy vegetables indicating that males decreased their intakes of these healthy foods more than females. The intakes of several healthy foods did not significantly change over time including eggs, chicken (not fried) and tea.
Intakes (g/day) are from beginning to end of first-year university in male (n = 50) and female (n = 210) students.
Intakes (g/day) are from beginning to end of first-year university in male (n = 50) and female (n = 210) students.
Table 4 depicts foods that are generally seen as unhealthy along with their accompanying intakes in g/day for males and females. Significant time effects indicating reductions in intake for both sexes were observed for pastries, fried fish, meat dishes and ice cream. Time effects indicating increased intakes for both sexes were observed for fried chicken, beer and liquor. Significant interactions indicated that donuts/pastries, fried chicken, beer and liquor increased more in males, and energy drinks increased more in females. French fries and wine tended to increase more in females than males. Intakes of pizza, macaroni and cheese, candy, sauces, added salt, fruit juice, energy drinks, soft drinks, and wine did not significantly change from beginning to end of the study.
There were several significant (all p<0.05) and plausible correlations between changes in dietary variables and changes in body composition variables, and/or changes within 2 dietary variables. These were all exploratory in nature. For example, change in waist circumference was positively correlated with changes in saturated fat (R = 0.37) and sodium intake (R = 0.36) as well as pizza (R = 0.39) and fried chicken (R = 0.36), and negatively correlated with changes in yogurt intake (R = -0.43), but only in males that gained body weight (n = 46, mean weight gain = 4.3 ± 3.1 kg). Likewise, change in fat mass negatively correlated with change in yogurt (R = -0.37) and positively correlated with changes in fried chicken (R = 0.53) in males that gained body weight. For females that gained body weight (n = 155; mean weight gain = 2.8 ± 2.5 kg), change in waist circumference was negatively correlated with carrot intake (R = -0.28) and positively correlated with alcohol intake as mg of ethanol (R = 0.16) and a composite term for all alcoholic beverages (beer, wine and liquor combined; R = 0.18). Apple (R = -0.15), carrot (R = -0.27) and liquor intake (R = 0.16) were significantly correlated with waist circumference in all females (n = 210) but not males. In terms of fat mass or %body fat, oranges (R = -0.17), broccoli (R = -0.14), tomatoes (R = -0.14), corn (R = -0.15) and energy drinks (R = 0.14) were significantly correlated in all females but not males; whereas temperate fruit (R = -0.28), yogurt (R = -0.38), cheese (R = -0.31) and fried chicken (R = 0.45) were significantly correlated in all males (n = 50) but not females. In terms of correlated foods/beverages, juice intake was significantly positively correlated with total calories (all males: R = 0.33; all females: R = 0.20) and total sugars (all males: R = 0.57; all females: R = 0.52), as was soft drinks with total sugars (all males: R = 0.29; all females: R = 0.26). Beer intake was significantly positively correlated with liquor intake (R = 0.34) in all males and wine intake (R = 0.23) in all females.
This study provides important insight regarding the sex-specific changes in body weight and adiposity, and sheds light on some sex-specific changes in dietary intake and quality in first year university students. There were 4 main findings from this study. 1) Males and females display different patterns of body weight and body composition changes during first-year university (Table 1). Both males and females gain a significant amount of body weight (and BMI) with males gaining more than females. Males also had greater absolute increases in waist circumference, waist to hip ratio, fat mass and lean mass than females, but when fat mass was expressed as a percent of total weight gained, females gained more fat than males. 2) Total energy intake remained the same throughout the year, with no difference between sexes. This was accompanied by no change in most nutrients except for an increase in alcohol (mg ethanol) in both sexes but more so in males (Table 2). 3) Diet quality decreased over time. Specifically, overall patterns of intake show that the consumption of most healthy foods/beverages decreased, a few remained the same and none increased (except for coffee; Table 3), whereas the consumption of unhealthy foods/beverages either increased, decreased or remained the same (Table 4). These adverse changes were more pronounced in males versus females. For example, males displayed greater reductions in vegetable intake and greater increases in donuts/cakes, fried chicken, beer and liquor compared to females. This indicates a decrease in overall diet quality and an adoption of unhealthy eating habits. 4) Some dietary intake changes correlated with fat mass and waist circumference change indicating that poor dietary choices were associated with increased adiposity. Thus, our research demonstrates that sex differences do exist in several of the measured variables indicating that males and females respond differently in terms of diet and body composition/anthropometry change during this critical time. Indeed, males demonstrated greater overall adverse changes.
In the media and on campuses, weight gain is commonly referred to as the “Freshman 15” [5, 23], which is the notion that students in their first year of university gain, on average, 15 lbs. While this is a popular general concept, it is not supported by most research [5, 23]. A meta-analysis from 2009 of 24 studies with a total of 3,401 participants (85% female) calculated that the average weight gain was only 1.8 kg (4.0 lbs) during first-year university . A more recent and updated meta-analysis (2015) of 22 longitudinal studies (5,549 students) calculated an average weight gain of only 1.4 kg (3.1 lbs) during first-year university . Within these meta-analyses, there were wide ranges of weight change; 0.7 kg to 4 kg (1.5 lbs to 8.8 lbs)  and -0.7 kg to 3.1 kg (-1.5 lbs to 6.8 lbs) . Despite average weight changes generally being of smaller magnitude, they still represent a weight gain in these students that is 5 times greater than the general population over a year . In addition, some studies in which both males and females are studied, show that males typically gain more weight than females [3, 5, 13, 14]. Taken together, these meta-analyses demonstrate (in ~9000 students) that an average modest weight gain does occur, however, they provide no information on the composition of the weight gained and little discussion on the factors that may lead to this weight gain. Our results are consistent with these general patterns and are on the higher end of the reported ranges demonstrating body weight gains of 3.8 kg (8.4 lbs) in males and 1.8 kg (4.0 lbs) in females, and body fat gains of 2.7 kg (6.0 lbs) and 1.5 kg (3.3 lbs), respectively. While these gains are less than the alleged 15 lbs, research has documented that even a 1 kg gain in body weight (or a 1 cm gain in waist circumference) is associated with increased disease risk [50, 51].
Trends in weight gain during this period are well documented, however, the assessment of body composition is less so. The latter is important because it provides insight into healthy (i.e. increases in lean mass) or unhealthy (i.e. increases in fat mass) weight change [50, 52]. We demonstrated that while males and females both gained weight, males gained more absolute weight in all compartments compared to females, which was likely reflective of their greater total weight gain. However, females gained relatively more fat mass and relatively less lean mass than males. This difference is not necessarily able to be explained by divergent dietary intakes and may relate to other lifestyle factors like physical activity. Indeed, and published elsewhere , all intensities of physical activity (light, moderate, vigorous) significantly decreased in both sexes over the year. However, despite an overall reduction in physical activity minutes, our research also demonstrated an increase in “other [physical] activities” over the year, and males cited their other activity of choice as weight lifting/resistance training (whereas females cited fitness classes). Although overall physical activity decreased, this may have impacted our lean mass results. Nevertheless, fat mass and waist to hip ratio increased in both groups, and more so in males.
Energy intake decreased by 250–400 kcal/d over the year (Table 2). This decrease, while significant, is accounted for by participants’ living arrangements (covariate). A reduction in total energy intake accompanied by an increase in body weight was previously observed by Butler et al., in 54 female first-year students  and by Jung et al., in 66 female first year students . Butler et al.  used a FFQ, and Jung et al.  used 3-day diet records. Reasons for decreased energy and food/nutrient intake that are not congruent with body weight/composition results may relate to various factors including underreporting [45, 53], a greater awareness of food consumption, the new need for students to shop for, cook and prepare their own food, and the general higher cost of food, particularly healthy food [24, 27, 54]. Given that most students in our study were living in residence and on a meal plan (and therefore did not need to cook/buy their own food per se), it is possible that other factors are contributing to a decreased energy intake including a lack of a variety of foods. Future research should continue to explore these barriers to healthy eating in this population possibly also under different living situations.
Many studies that report modest dietary intake changes (positive or negative) over the academic year have found no significant associations between diet and weight or body composition change [28, 55]. This indicates that long-term changes in recorded (and usually self-reported) dietary intake may not be the main driver (or may only be part of the puzzle) of overall weight change in this population. However, using an exploratory approach, our study did find significant correlations between fat mass and waist circumference with nutrient/food intake changes indicating a relationship between the changes in dietary intake and body composition/adiposity. For example, saturated fat and sodium intake as well as pizza and fried chicken were negatively correlated with body composition changes in males who gained weight. Additionally, fruit, yogurt and cheese intakes were negatively correlated with fat mass in males.
Our study demonstrated negative changes in diet quality for both sexes, supporting previous research in young adults, particularly those in university, citing decreases in diet quality such as frequent fast food consumption, decreased dairy, fruit and vegetable intakes, decreased consumption of whole grain carbohydrates and increases in energy drinks, alcohol and pop/soda [4, 36, 56–66]. A decrease in diet quality may also be explained by the fact that students are living away from home, they are solely responsible for feeding themselves, there are more social pressures to eat or not eat certain foods/beverages  accompanied by less parental influence  and lack of self-control [27, 69], a greater availability and lower cost of poor quality foods , and a general lack of nutrition knowledge [71, 72]. Again, given the fact that most of our participants lived in residence, another factor could be the types of foods that are available on campus [73, 74]. Although there is provision of a variety of foods on our campus, food options which are convenient, fast and readily available for lower prices tend to not be as healthy. This trend is wide-spread across post-secondary institutions [74, 75]. A novel finding from our study is the divergent eating patterns of males versus females. While both sexes demonstrated shifts towards poorer diet quality, males made larger negative dietary changes than females.
An interesting finding from this study pertained to alcohol and other beverage intakes. Alcohol (mg of ethanol/day) and consumption of alcoholic drinks (beer and liquor) significantly increased. In addition, soft drinks (pop/soda), energy drinks and fruit juice intake did not significantly change over time, however females had a greater increase in energy drink consumption than males. Thus, by the end of the study, alcohol and potentially other sugary/caffeinated drinks represented a higher percentage of total energy intake. This may help to partially explain the increase in body weight, waist circumference and fat mass observed in both sexes. Several studies in first-year cohorts have shown similar results [28, 29, 76]. In particular, Butler et al., showed significant increases in alcohol intake in female students both as a % of total energy intake and as the number of beverages per day, while also demonstrating a significant weight gain . Our study extends these findings to a larger sample size and particularly, to males. Also, in accordance with the literature, males tended to have a higher consumption of alcohol compared to females [66, 77]. The greater increase in alcohol may relate to the greater waist circumference, waist to hip ratio and fat mass observed in males versus females, as excess calories from alcohol are more likely to be deposited as abdominal fat rather than fat elsewhere in the body . This is concerning since increased abdominal fat is preferentially associated with an increased risk of chronic disease (diabetes and heart disease) [52, 77, 79].
Strengths of our study included the longitudinal design, measured rather than self-reported body weight, a larger sample size, as well as the measurement of a comprehensive set of variables including anthropometry, body composition and nutrient/food intake. Furthermore, the inclusion of both males and females in our sample allowed for direct comparisons of all variables between the sexes, enabling us to uncover interesting findings relating to differential changes during this critical time. Only a few studies have directly compared between sexes and only for some of these variables [13, 80, 81]. Most research in first-year students has focused on females and did not measure body composition [5, 23].
Limitations of our study may relate to the use of the FFQ since the possibility of inaccurate estimation of dietary intake may have affected our results. Underreporting or misreporting seems to be a general issue when assessing habitual diets over the long term . This may be due to a lack of precision of the instrument (i.e. the FFQ), the inability of the individual to accurately estimate and report their long-term intake, and/or the reluctance of the individual to truthfully report intake. This phenomenon of nutritional misreporting has been widely cited in the literature [53, 82–84], and can be an issue with all methods of self-reported dietary assessment. While we are aware of this issue, misreporting should affect the results at both time points, and therefore cannot entirely explain the observed differences over the academic year or between sexes. Moreover, validated self-reporting tools are still the most widely used methods for nutrition data collection . Another limitation may relate to our classification of healthy vs. unhealthy foods. Although our categorization is based on resources like Canada’s Food Guide  and related published meta-analyses [43, 44], some foods may be misclassified for some people based on how they were consumed. For example, eating too much read meat is not advised, neither is too much pasta or pasta with a high-fat sauce. Nonetheless, to account for some of these factors, we separated healthy vs. unhealthy versions of foods when this information was available from the FFQ. For example, pasta was labeled as healthy, but macaroni and cheese was labeled as unhealthy. Steak and poultry were labeled as healthy, whereas meat dishes (hot dogs, hamburgers, lunch meat, etc.) and fried chicken were labeled as unhealthy. Another limitation may be that we focused our study on diet-related changes and did not discuss changes in habitual physical activity. Physical activity data from this sample has been published elsewhere . Decreases in the amount (i.e. energy expenditure) and changes in the type (i.e. aerobic vs. resistance exercise) of physical activity could further explain the increase in body weight, fat and lean mass, as well as the different ratios of fat:lean mass between the sexes. To help account for these potential effects, 3 levels of physical activity (light, moderate and vigorous) were assessed as covariates and if significant, were included in the individual RMANOVA models for the anthropometric, body composition and nutritional intake data. Lastly, our study may have incurred an element of sampling bias in that potentially healthier students who are curious about their eating habits and body changes over the year were more inclined to participate. If this was indeed the case, our changes would have potentially been greater than what we observed if less ‘health-minded’ students participated.
Results from our study demonstrate that young male and female students undergo unfavorable and differential changes to their dietary intakes during the transition to university life. These changes reflect a poorer quality diet for both sexes, but more so for males, and were accompanied by increases in body weight, BMI, waist to hip ratio and body fat, which could lead to possible longer-term health implications and increased disease risk [50, 51]. Sex-specific changes were evident for nutrition indicating that males’ diets were lower in quality, and body composition changes indicated that males experienced more adverse changes by gaining more body weight, waist circumference and fat mass than females. Future research should focus on mitigating these adverse changes particularly during times of stress through the development of effective sex-specific interventions targeted at improving dietary habits and nutritional knowledge, as well as mitigating adverse body composition changes as students transition into university life.
The authors would like to thank A. McKinnon for her help with the data collection, D. Brown for his help with the statistical analysis, and all the participants involved in this study for their time.
- 1. Abarca-Gómez L, Abdeen ZA, Hamid ZA, Abu-Rmeileh NM, Acosta-Cazares B, Acuin C, et al. Worldwide trends in body-mass index, underweight, overweight, and obesity from 1975 to 2016: a pooled analysis of 2416 population-based measurement studies in 128.9 million children, adolescents, and adults. Lancet. 2017;390(10113):2627–42. pmid:29029897; PubMed Central PMCID: PMCPMC5735219.
- 2. Afshin A, Forouzanfar MH, Reitsma MB, Sur P, Estep K, Lee A, et al. Health Effects of Overweight and Obesity in 195 Countries over 25 Years. N Engl J Med. 2017;377(1):13–27. pmid:28604169; PubMed Central PMCID: PMCPMC5477817.
- 3. Papadaki A, Hondros G, J AS, Kapsokefalou M. Eating habits of university students living at, or away from home in Greece. Appetite. 2007;49(1):169–76. pmid:17368642.
- 4. Takomana G, Kalimbira AA. Weight gain, physical activity and dietary changes druing the first year at college. S Afr J Clin Nutr. 2012;25(3):132–9.
- 5. Vella-Zarb RA, Elgar FJ. The 'freshman 5': a meta-analysis of weight gain in the freshman year of college. J Am Coll Health. 2009;58(2):161–6. pmid:19892653.
- 6. RM M. Growth and maturation: Normal variation and the effects of training. Perspectives in Exercise Science and Sports Medicine, Vol. 2, Youth, Exercise, and Sport. Gisolfi C, Lamb D, editors. Indianapolis, IN.: Benchmark Press; 1989.
- 7. Gunes FE, Bekiroglu N, Imeryuz N, Agirbasli M. Relation between Eating Habits and a High Body Mass Index among Freshman Students: A Cross-Sectional Study. Journal of the American College of Nutrition. 2012;31(3):167–74. WOS:000313470500005. pmid:23204153
- 8. Morseth B, Jorgensen L, Emaus N, Jacobsen BK, Wilsgaard T. Tracking of leisure time physical activity during 28 yr in adults: the Tromso study. Med Sci Sports Exerc. 2011;43(7):1229–34. pmid:21131860.
- 9. Mycek S. The dire cost of obesity. Mater Manag Health Care. 2004;13(4):18–21. pmid:15131936.
- 10. Abdullah A, Wolfe R, Stoelwinder JU, de Courten M, Stevenson C, Walls HL, et al. The number of years lived with obesity and the risk of all-cause and cause-specific mortality. Int J Epidemiol. 2011;40(4):985–96. pmid:21357186.
- 11. Johnson PH, Annesi JJ. Factors Related to Weight Gain/Loss among Emerging Adults with Obesity. Am J Health Behav. 2018;42(3):3–16. pmid:29663976.
- 12. Sun Y, Liu B, Snetselaar LG, Robinson JG, Wallace RB, Peterson LL, et al. Association of fried food consumption with all cause, cardiovascular, and cancer mortality: prospective cohort study. BMJ. 2019;364:k5420. pmid:30674467.
- 13. Cluskey M, Grobe D. College weight gain and behavior transitions: male and female differences. J Am Diet Assoc. 2009;109(2):325–9. pmid:19167962
- 14. Mihalopoulos NL, Auinger P, Klein JD. The Freshman 15: is it real? J Am Coll Health. 2008;56(5):531–3. pmid:18400665; PubMed Central PMCID: PMCPMC2532948.
- 15. Gropper SS, Simmons KP, Connell LJ, Ulrich PV. Weight and Body Composition Changes during the First Three Years of College. J Obes. 2012;2012:634048. pmid:23050127; PubMed Central PMCID: PMCPMC3463803.
- 16. Robinson WR, Stevens J, Kaufman JS, Gordon-Larsen P. The role of adolescent behaviors in the female-male disparity in obesity incidence in US black and white young adults. Obesity (Silver Spring). 2010;18(7):1429–36. pmid:19875993; PubMed Central PMCID: PMCPMC2888698.
- 17. Guo SS, Wu W, Chumlea WC, Roche AF. Predicting overweight and obesity in adulthood from body mass index values in childhood and adolescence. Am J Clin Nutr. 2002;76(3):653–8. PubMed pmid:12198014.
- 18. Symmank C, Mai R, Hoffmann S, Stok FM, Renner B, Lien N, et al. Predictors of food decision making: A systematic interdisciplinary mapping (SIM) review. Appetite. 2017;110:25–35. pmid:27871944.
- 19. Brug J, van der Ploeg HP, Loyen A, Ahrens W, Allais O, Andersen LF, et al. Determinants of diet and physical activity (DEDIPAC): a summary of findings. Int J Behav Nutr Phys Act. 2017;14(1):150. pmid:29100542; PubMed Central PMCID: PMCPMC5670716.
- 20. Juonala M, Magnussen CG, Berenson GS, Venn A, Burns TL, Sabin MA, et al. Childhood adiposity, adult adiposity, and cardiovascular risk factors. N Engl J Med. 2011;365(20):1876–85. pmid:22087679.
- 21. Zheng Y, Manson JE, Yuan C, Liang MH, Grodstein F, Stampfer MJ, et al. Associations of Weight Gain From Early to Middle Adulthood With Major Health Outcomes Later in Life. JAMA. 2017;318(3):255–69. pmid:28719691; PubMed Central PMCID: PMCPMC5817436.
- 22. Silventoinen K, Rokholm B, Kaprio J, Sorensen TI. The genetic and environmental influences on childhood obesity: a systematic review of twin and adoption studies. Int J Obes (Lond). 2010;34(1):29–40. pmid:19752881.
- 23. Vadeboncoeur C, Townsend N, Foster C. A meta-analysis of weight gain in first year university students: is freshman 15 a myth? BMC Obes. 2015;2:22. pmid:26217537; PubMed Central PMCID: PMCPMC4511069.
- 24. Deforche B, Van Dyck D, Deliens T, De Bourdeaudhuij I. Changes in weight, physical activity, sedentary behaviour and dietary intake during the transition to higher education: a prospective study. Int J Behav Nutr Phys Act. 2015;12:16. pmid:25881147; PubMed Central PMCID: PMCPMC4332914.
- 25. Levitsky DA, Garay J, Nausbaum M, Neighbors L, Dellavalle DM. Monitoring weight daily blocks the freshman weight gain: a model for combating the epidemic of obesity. Int J Obes (Lond). 2006;30(6):1003–10. pmid:16446748.
- 26. Lowe MR, Annunziato RA, Markowitz JT, Didie E, Bellace DL, Riddell L, et al. Multiple types of dieting prospectively predict weight gain during the freshman year of college. Appetite. 2006;47(1):83–90. pmid:16650913.
- 27. Lacaille LJ, Dauner KN, Krambeer RJ, Pedersen J. Psychosocial and environmental determinants of eating behaviors, physical activity, and weight change among college students: a qualitative analysis. J Am Coll Health. 2011;59(6):531–8. pmid:21660808.
- 28. Pullman AW, Masters RC, Zalot LC, Carde LE, Saraiva MM, Dam YY, et al. Effect of the transition from high school to university on anthropometric and lifestyle variables in males. Appl Physiol Nutr Metab. 2009;34(2):162–71. pmid:19370046.
- 29. Butler SM, Black DR, Blue CL, Gretebeck RJ. Change in diet, physical activity, and body weight in female college freshman. Am J Health Behav. 2004;28(1):24–32. pmid:14977156.
- 30. Edmonds MJ, Ferreira KJ, Nikiforuk EA, Finnie AK, Leavey SH, Duncan AM, et al. Body weight and percent body fat increase during the transition from high school to university in females. J Am Diet Assoc. 2008;108(6):1033–7. pmid:18502240.
- 31. Jung ME, Bray SR, Martin Ginis KA. Behavior change and the freshman 15: tracking physical activity and dietary patterns in 1st-year university women. J Am Coll Health. 2008;56(5):523–30. pmid:18400664.
- 32. Gil A, Martinez de Victoria E, Olza J. Indicators for the evaluation of diet quality. Nutr Hosp. 2015;31 Suppl 3:128–44. pmid:25719781.
- 33. Kant AK, Schatzkin A, Graubard BI, Schairer C. A prospective study of diet quality and mortality in women. JAMA. 2000;283(16):2109–15. pmid:10791502.
- 34. Jacques PF, Tucker KL. Are dietary patterns useful for understanding the role of diet in chronic disease? Am J Clin Nutr. 2001;73(1):1–2. PubMed pmid:11124739.
- 35. Alkerwi A. Diet quality concept. Nutrition. 2014;30(6):613–8. pmid:24800663.
- 36. Gorgulho B, Marchioni DM, Conceicao AB, Steluti J, Mussi MH, Nagai-Manelli R, et al. Quality of diet of working college students. Work. 2012;41 Suppl 1:5806–9. pmid:22317694.
- 37. Breslow RA, Guenther PM, Smothers BA. Alcohol drinking patterns and diet quality: the 1999–2000 National Health and Nutrition Examination Survey. Am J Epidemiol. 2006;163(4):359–66. pmid:16394204.
- 38. Deliens T, Clarys P, De Bourdeaudhuij I, Deforche B. Determinants of eating behaviour in university students: a qualitative study using focus group discussions. BMC Public Health. 2014;14:53. pmid:24438555; PubMed Central PMCID: PMCPMC3905922.
- 39. Nutrition Quest: Assessment & Analysis Services. 2014.
- 40. Government of Canada: Canada's Food Guide 2019 [April 23, 2019]. Available from: https://food-guide.canada.ca/en/.
- 41. Jessri M, Ng AP, L'Abbe MR. Adapting the Healthy Eating Index 2010 for the Canadian Population: Evidence from the Canadian National Nutrition Survey. Nutrients. 2017;9(8). pmid:28825674; PubMed Central PMCID: PMCPMC5579703.
- 42. Krebs-Smith SM, Pannucci TE, Subar AF, Kirkpatrick SI, Lerman JL, Tooze JA, et al. Update of the Healthy Eating Index: HEI-2015. J Acad Nutr Diet. 2018;118(9):1591–602. pmid:30146071.
- 43. Mente A, de Koning L, Shannon HS, Anand SS. A systematic review of the evidence supporting a causal link between dietary factors and coronary heart disease. Arch Intern Med. 2009;169(7):659–69. pmid:19364995.
- 44. Schwingshackl L, Bogensberger B, Hoffmann G. Diet Quality as Assessed by the Healthy Eating Index, Alternate Healthy Eating Index, Dietary Approaches to Stop Hypertension Score, and Health Outcomes: An Updated Systematic Review and Meta-Analysis of Cohort Studies. J Acad Nutr Diet. 2018;118(1):74–100 e11. pmid:29111090.
- 45. Rhee JJ, Sampson L, Cho E, Hughes MD, Hu FB, Willett WC. Comparison of methods to account for implausible reporting of energy intake in epidemiologic studies. Am J Epidemiol. 2015;181(4):225–33. pmid:25656533; PubMed Central PMCID: PMCPMC4325679.
- 46. Bakeman R. Recommended effect size statistics for repeated measures designs. Behav Res Methods. 2005;37(3):379–84. pmid:16405133.
- 47. Thomas AM, Beaudry KM, Gammage KL, Klentrou P, Josse AR. Physical Activity, Sport Participation, and Perceived Barriers to Engagement in First-Year Canadian University Students. J Phys Act Health. 2019:1–10. pmid:31130058.
- 48. Zulyniak MA, de Souza RJ, Mente A, Kandasamy S, Nundy M, Desai D, et al. A randomized controlled trial of the effects of a prudent diet on cardiovascular risk factors, gene expression, and DNA methylation—the Diet and Genetic Intervention (DIGEST) Pilot study. BMC Nutrition. 2016;2(1):34.
- 49. Levitsky DA, Halbmaier CA, Mrdjenovic G. The freshman weight gain: a model for the study of the epidemic of obesity. Int J Obes Relat Metab Disord. 2004;28(11):1435–42. pmid:15365585.
- 50. Koh-Banerjee P, Wang Y, Hu FB, Spiegelman D, Willett WC, Rimm EB. Changes in body weight and body fat distribution as risk factors for clinical diabetes in US men. Am J Epidemiol. 2004;159(12):1150–9. pmid:15191932.
- 51. de Koning L, Merchant AT, Pogue J, Anand SS. Waist circumference and waist-to-hip ratio as predictors of cardiovascular events: meta-regression analysis of prospective studies. Eur Heart J. 2007;28(7):850–6. pmid:17403720.
- 52. Wajchenberg BL. Subcutaneous and visceral adipose tissue: Their relation to the metabolic syndrome. Endocrine Reviews. 2000;21(6):697–738. WOS:000165886500004. pmid:11133069
- 53. Bedard D, Shatenstein B, Nadon S. Underreporting of energy intake from a self-administered food-frequency questionnaire completed by adults in Montreal. Public Health Nutr. 2004;7(5):675–81. pmid:15251058.
- 54. Greaney ML, Less FD, White AA, Dayton SF, Riebe D, Blissmer B, et al. College students' barriers and enablers for healthful weight management: a qualitative study. J Nutr Educ Behav. 2009;41(4):281–6. pmid:19508934.
- 55. Holm-Denoma JM, Joiner TE, Vohs KD, Heatherton TF. The "freshman fifteen" (the "freshman five" actually): predictors and possible explanations. Health Psychol. 2008;27(1S):S3–9. pmid:18248103.
- 56. Poulos NS, Pasch KE. Energy drink consumption is associated with unhealthy dietary behaviours among college youth. Perspect Public Health. 2015;135(6):316–21. pmid:25667166.
- 57. Pelletier JE, Laska MN. Campus food and beverage purchases are associated with indicators of diet quality in college students living off campus. Am J Health Promot. 2013;28(2):80–7. pmid:23631451; PubMed Central PMCID: PMCPMC3893717.
- 58. Moreno-Gomez C, Romaguera-Bosch D, Tauler-Riera P, Bennasar-Veny M, Pericas-Beltran J, Martinez-Andreu S, et al. Clustering of lifestyle factors in Spanish university students: the relationship between smoking, alcohol consumption, physical activity and diet quality. Public Health Nutr. 2012;15(11):2131–9. pmid:22314203.
- 59. Satalic Z, Baric IC, Keser I. Diet quality in Croatian university students: energy, macronutrient and micronutrient intakes according to gender. Int J Food Sci Nutr. 2007;58(5):398–410. pmid:17558731.
- 60. Steptoe A, Wardle J, Cui W, Bellisle F, Zotti AM, Baranyai R, et al. Trends in smoking, diet, physical exercise, and attitudes toward health in European university students from 13 countries, 1990–2000. Prev Med. 2002;35(2):97–104. pmid:12200093.
- 61. Niemeier HM, Raynor HA, Lloyd-Richardson EE, Rogers ML, Wing RR. Fast food consumption and breakfast skipping: predictors of weight gain from adolescence to adulthood in a nationally representative sample. J Adolesc Health. 2006;39(6):842–9. pmid:17116514.
- 62. Paeratakul S, Ferdinand DP, Champagne CM, Ryan DH, Bray GA. Fast-food consumption among US adults and children: Dietary and nutrient intake profile. Journal of the American Dietetic Association. 2003;103(10):1332–8. WOS:000185718600015. pmid:14520253
- 63. Freedman MR. Gender, residence and ethnicity affect freshman BMI and dietary habits. Am J Health Behav. 2010;34(5):513–24. pmid:20524881.
- 64. Correa-Burrows P, Burrows R, Blanco E, Reyes M, Gahagan S. Nutritional quality of diet and academic performance in Chilean students. Bull World Health Organ. 2016;94(3):185–92. pmid:26966329; PubMed Central PMCID: PMCPMC4773934.
- 65. Malik VS, Schulze MB, Hu FB. Intake of sugar-sweetened beverages and weight gain: a systematic review. Am J Clin Nutr. 2006;84(2):274–88. PubMed pmid:16895873; PubMed Central PMCID: PMCPMC3210834.
- 66. Nies MA, Sun L, Kazemi D, Carriker A, Dmochowski J. Relationship of body mass index to alcohol consumption in college freshmen. ScientificWorldJournal. 2012;2012:849018. pmid:22654639; PubMed Central PMCID: PMCPMC3354654.
- 67. Kasparek DG, Corwin SJ, Valois RF, Sargent RG, Morris RL. Selected health behaviors that influence college freshman weight change. J Am Coll Health. 2008;56(4):437–44. pmid:18316289.
- 68. Marques-Vidal P, Goncalves A, Dias CM. Milk intake is inversely related to obesity in men and in young women: data from the Portuguese Health Interview Survey 1998–1999. Int J Obes (Lond). 2006;30(1):88–93. pmid:16116492.
- 69. Murphy CM, Stojek MK, MacKillop J. Interrelationships among impulsive personality traits, food addiction, and Body Mass Index. Appetite. 2014;73:45–50. pmid:24511618; PubMed Central PMCID: PMCPMC4859335.
- 70. Anding JD, Suminski RR, Boss L. Dietary intake, body mass index, exercise, and alcohol: are college women following the dietary guidelines for Americans? J Am Coll Health. 2001;49(4):167–71. pmid:11272623.
- 71. Yahia N, Brown CA, Rapley M, Chung M. Level of nutrition knowledge and its association with fat consumption among college students. BMC Public Health. 2016;16(1):1047. pmid:27716127; PubMed Central PMCID: PMCPMC5050673.
- 72. Emrich TE, Mazier MJ. Impact of nutrition education on university students' fat consumption. Can J Diet Pract Res. 2009;70(4):187–92. pmid:19958574.
- 73. Tseng M, DeGreef K, Fishler M, Gipson R, Koyano K, Neill DB. Assessment of a University Campus Food Environment, California, 2015. Prev Chronic Dis. 2016;13:E18. pmid:26851337; PubMed Central PMCID: PMCPMC4747435.
- 74. Tam R, Yassa B, Parker H, O'Connor H, Allman-Farinelli M. University students' on-campus food purchasing behaviors, preferences, and opinions on food availability. Nutrition. 2017;37:7–13. pmid:28359366.
- 75. Horacek TM, Erdman MB, Byrd-Bredbenner C, Carey G, Colby SM, Greene GW, et al. Assessment of the dining environment on and near the campuses of fifteen post-secondary institutions. Public Health Nutr. 2013;16(7):1186–96. pmid:23174458.
- 76. Pliner P, Saunders T. Vulnerability to freshman weight gain as a function of dietary restraint and residence. Physiol Behav. 2008;93(1–2):76–82. pmid:17765934.
- 77. Breslow RA, Smothers BA. Drinking patterns and body mass index in never smokers: National Health Interview Survey, 1997–2001. Am J Epidemiol. 2005;161(4):368–76. pmid:15692081.
- 78. Addolorato G, Capristo E, Greco AV, Stefanini GF, Gasbarrini G. Influence of chronic alcohol abuse on body weight and energy metabolism: is excess ethanol consumption a risk factor for obesity or malnutrition? Journal of Internal Medicine. 1998;244(5):387–95. WOS:000076938800004. pmid:9845854
- 79. Muller MJ. [Alcohol and body weight]. Z Gastroenterol. 1999;37(1):33–43. pmid:10091283.
- 80. Economos CD, Hildebrandt ML, Hyatt RR. College freshman stress and weight change: differences by gender. Am J Health Behav. 2008;32(1):16–25. pmid:18021030.
- 81. Debate RD, Topping M, Sargent RG. Racial and gender differences in weight status and dietary practices among college students. Adolescence. 2001;36(144):819–33. pmid:11928885.
- 82. Black AE, Goldberg GR, Jebb SA, Livingstone MBE, Cole TJ, Prentice AM. Critical-Evaluation of Energy-Intake Data Using Fundamental Principles of Energy Physiology .2. Evaluating the Results of Published Surveys. European Journal of Clinical Nutrition. 1991;45(12):583–99. WOS:A1991HH29100002. pmid:1810720
- 83. Livingstone MB, Black AE. Markers of the validity of reported energy intake. J Nutr. 2003;133 Suppl 3:895S–920S. PubMed pmid:12612176.
- 84. Hebert JR, Patterson RE, Gorfine M, Ebbeling CB, St Jeor ST, Chlebowski RT. Differences between estimated caloric requirements and self-reported caloric intake in the women's health initiative. Annals of Epidemiology. 2003;13(9):629–37. WOS:000186241000006. pmid:14732302