Peer Review History
| Original SubmissionJuly 12, 2024 |
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PONE-D-24-28077Food for Thought: The Impact of Short Term Fasting on Cognitive AbilityPLOS ONE Dear Dr. Landini, Thank you for submitting your manuscript to PLOS ONE. After careful consideration, we feel that it has merit but does not fully meet PLOS ONE’s publication criteria as it currently stands. Therefore, we invite you to submit a revised version of the manuscript that addresses the points raised during the review process. I have now heard back from two knowledgeable referees who have published well in the area of intermittent fasting. The news is mixed. One referee recommends a "reject," while the other asks for a revision. While I am not an expert in the area, I could follow the concerns of the referees, esp. the more negative one. I am offering you a chance to revise the manuscript paying careful attention to the latter report. I realize some of the comments relate to "unfixable" matters -- the experiment has been done and one cannot go back and run it all over again. Keeping that in mind, I'd like you to defend your design choices carefully in a "discussion" section as well as in a "limitations" section. Both referees complain about the way the paper is structured or the way the results are presented; please fix that. I will not send the paper back to the referees, so you have one final chance to make your case to me for why the paper should be published. I like the paper and your design and do see a path to eventual publication provided you can convince me that you've paid attention to both referees' concerns and adequately defended the paper. Please submit your revised manuscript by Oct 19 2024 11:59PM. If you will need more time than this to complete your revisions, please reply to this message or contact the journal office at plosone@plos.org. When you're ready to submit your revision, log on to https://www.editorialmanager.com/pone/ and select the 'Submissions Needing Revision' folder to locate your manuscript file. Please include the following items when submitting your revised manuscript:
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Kind regards, Joydeep Bhattacharya Academic Editor PLOS ONE Journal requirements: When submitting your revision, we need you to address these additional requirements. 1. Please ensure that your manuscript meets PLOS ONE's style requirements, including those for file naming. The PLOS ONE style templates can be found at https://journals.plos.org/plosone/s/file?id=wjVg/PLOSOne_formatting_sample_main_body.pdf and 2. Please update your submission to use the PLOS LaTeX template. The template and more information on our requirements for LaTeX submissions can be found at http://journals.plos.org/plosone/s/latex. 3. Please include your full ethics statement in the ‘Methods’ section of your manuscript file. In your statement, please include the full name of the IRB or ethics committee who approved or waived your study, as well as whether or not you obtained informed written or verbal consent. If consent was waived for your study, please include this information in your statement as well. 4. We note that you have referenced (Heather Schofield. The economic costs of low caloric intake: Evidence from india. Unpublished Manuscript, 2014) which has currently not yet been accepted for publication. Please remove this from your References and amend this to state in the body of your manuscript: (ie “Bewick et al. [Unpublished]”) as detailed online in our guide for authors http://journals.plos.org/plosone/s/submission-guidelines#loc-reference-style. 5. Please include captions for your Supporting Information files at the end of your manuscript, and update any in-text citations to match accordingly. Please see our Supporting Information guidelines for more information: http://journals.plos.org/plosone/s/supporting-information. Reviewers' comments: Reviewer's Responses to Questions Comments to the Author 1. Is the manuscript technically sound, and do the data support the conclusions? The manuscript must describe a technically sound piece of scientific research with data that supports the conclusions. Experiments must have been conducted rigorously, with appropriate controls, replication, and sample sizes. The conclusions must be drawn appropriately based on the data presented. Reviewer #1: No Reviewer #2: Yes ********** 2. Has the statistical analysis been performed appropriately and rigorously? Reviewer #1: No Reviewer #2: Yes ********** 3. Have the authors made all data underlying the findings in their manuscript fully available? The PLOS Data policy requires authors to make all data underlying the findings described in their manuscript fully available without restriction, with rare exception (please refer to the Data Availability Statement in the manuscript PDF file). The data should be provided as part of the manuscript or its supporting information, or deposited to a public repository. For example, in addition to summary statistics, the data points behind means, medians and variance measures should be available. If there are restrictions on publicly sharing data—e.g. participant privacy or use of data from a third party—those must be specified. Reviewer #1: No Reviewer #2: No ********** 4. Is the manuscript presented in an intelligible fashion and written in standard English? PLOS ONE does not copyedit accepted manuscripts, so the language in submitted articles must be clear, correct, and unambiguous. Any typographical or grammatical errors should be corrected at revision, so please note any specific errors here. Reviewer #1: Yes Reviewer #2: Yes ********** 5. Review Comments to the Author Please use the space provided to explain your answers to the questions above. You may also include additional comments for the author, including concerns about dual publication, research ethics, or publication ethics. (Please upload your review as an attachment if it exceeds 20,000 characters) Reviewer #1: Thank you for an opportunity to review the manuscript titled: “Food for Thought: The Impact of Short-Term Fasting on Cognitive Ability.” The current study aims to investigate the effect of fasting on cognitive ability by manipulating fasting durations in a laboratory setting and measuring participants' performance on cognitive tasks. Overall, the study found no significant difference in cognitive ability across different fasting durations (3 hours, 12 hours, and control with a protein shake). Despite expectations, short-term fasting did not impact performance on the Raven's Progressive Matrices test. The current manuscript has several strengths such as relatively large sample size and a robust literature review. However, there are also numerous weaknesses that I highlight below: 1. Manipulation failure. There was significant overlap in the fasting durations reported by participants in the short and long fasting groups, which may have diluted the differences between treatments. This overlap could be a result of participants' non-compliance with fasting instructions or variability in individual metabolism and meal timing. As such, the manipulation has failed. Relatedly, I did not see a solid argumentation behind why these specific desired fasting durations (3 vs 12 hours) were selected. Is there anything specific that happens in human physiology after having fasted for 3 hours relative to 12 hours? Even more importantly, is abstaining from eating for 3 hours indeed a “fasting”? 2. Limited scope of cognitive tasks. The study focused solely on the Raven's Progressive Matrices test, which is a relatively narrow measure of the cognitive ability. A stronger justification behind the sole focus on this specific task is needed to build an argument that fasting might (or might not) affect cognitive capabilities. What about other aspects of cognitive ability such as, for instance, discount rate or impulsiveness? In sum, This narrow focus might not capture other aspects of cognitive function, such as memory, attention, or executive function, which could also be affected by fasting. 3. Unclear role of IAT. This is related to point above. When reading the manuscript, I thought that the implicit association test (IAT) will be yet another outcome variable, potentially broadening the scope of the investigation. However, the results section does not focus on IAT at all. 4. Claims not supported by the findings. For example, the authors claim in the abstract that their results contribute to the literature on the health implications of short-term fasting, despite finding null treatment effects on cognitive ability. It is unclear how the current findings contribute to this research area, especially considering the fasting manipulation did not produce significant results. I found many other unsupported claims in different parts of the manuscript. 5. The lack of the overarching research goal. The manuscript lacks a clear research goal and fails to support several claims. The role of the Implicit Association Test (IAT) is unjustified, and the operationalization of cognitive ability is limited. The introduction does not clearly position the research within a specific field of study. While resource scarcity is mentioned, the predictor variable—fasting differing in duration (albeit being short in general)—does not seem to represent resource scarcity effectively, as intermittent fasting is a voluntary practice for many. Additionally, the inclusion of variables such as ethnicity, BMI, income, and sleep duration in Table 1 lacks clear relevance to the study's main focus. For future research, I suggest the authors concentrate on a specific topic and position their work within a concrete research stream. 6. A lack of methodological rigor. The article presents itself more as a conceptual paper than an empirical research-based one. This is especially evident in the Results section. The results are not reported comprehensively, making it unclear what analyses were performed, what software was used for data analysis, and other methodological details. As a reader, I would be unable to replicate the findings and procedures, rendering the current findings non-replicable and limiting the methodological rigor of this research. For example, how were sleep hours recorded? How was the sample size justified? If the fasting manipulation failed, as evident from the data, and there were no differences across the "fasting" conditions, why weren’t these two groups merged to increase the power to detect significant differences between fasting and non-fasting conditions (if any)? There are many more methodological issues in this manuscript, and its potential resubmission should be consulted with a statistician. Reviewer #2: Summary Landini et al. studied the differences of satiety in a relatively large cohort of participants undergoing an acute fasting intervention. The study adds important value to the field of modern fasting research, finding that the acute state of fasting (avg.8-10 h post last meal) does not affect the cognitive ability of the participants in a Raven's Progressive Matrices test. While interesting to the intersection of nutrition and cognition, I have a few comments that should be addressed before considering the manuscript for publication. Comments to the authors: - The terminology of long/short fast is difficult. As the authors stated, the groups did not differ in their actual fasting length. Moreover, long-term fasting is usually used as a term to describe very low calorie diets > 48 h. Hence, I strongly recommend re-working the terminology of the interventions throughout all of the manuscript. - I like the idea of giving a protein shake to the control group. Could you provide the calories and composition of the drink? - Most fasting-type interventions are studied in the context of metabolically unhealthy people or cohorts of advanced age. Do the authors think that the outcome would differ in older people? - Since the effects of fasting likely intersect with circadian rhythms underlying metabolic and cognitive alterations throughout the day, it would be informative to provide the time of day when the tests were performed. - Please add a limitation chapter discussing, e.g., the lack of difference between the groups, the short intervention time, differences to long-term interventions, the lack of cognitive disability in the young cohort, only one test for cognitive function performed, etc. - Since there was no significant difference in fasting length between the intervention groups, the authors could combine the data and test it against the control group. - Table 2 legend states: “a Mean comparison between control and treated, b Kruskal-Wallis test for balance across fasting treatments.” However, no p values or mean comparison are given in the manuscript. - It would be important to state the differences between acute fasting and the outcome of weeks-long intermittent fasting/caloric restriction on cognitive ability more clearly early in the manuscript. ********** 6. PLOS authors have the option to publish the peer review history of their article (what does this mean?). If published, this will include your full peer review and any attached files. If you choose “no”, your identity will remain anonymous but your review may still be made public. Do you want your identity to be public for this peer review? For information about this choice, including consent withdrawal, please see our Privacy Policy. Reviewer #1: No Reviewer #2: No ********** [NOTE: If reviewer comments were submitted as an attachment file, they will be attached to this email and accessible via the submission site. Please log into your account, locate the manuscript record, and check for the action link "View Attachments". If this link does not appear, there are no attachment files.] While revising your submission, please upload your figure files to the Preflight Analysis and Conversion Engine (PACE) digital diagnostic tool, https://pacev2.apexcovantage.com/. PACE helps ensure that figures meet PLOS requirements. To use PACE, you must first register as a user. Registration is free. Then, login and navigate to the UPLOAD tab, where you will find detailed instructions on how to use the tool. If you encounter any issues or have any questions when using PACE, please email PLOS at figures@plos.org. Please note that Supporting Information files do not need this step. |
| Revision 1 |
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Food for Thought: The Impact of Short Term Fasting on Cognitive Ability PONE-D-24-28077R1 Dear Dr. Landini, We’re pleased to inform you that your manuscript has been judged scientifically suitable for publication and will be formally accepted for publication once it meets all outstanding technical requirements. Within one week, you’ll receive an e-mail detailing the required amendments. When these have been addressed, you’ll receive a formal acceptance letter and your manuscript will be scheduled for publication. An invoice will be generated when your article is formally accepted. Please note, if your institution has a publishing partnership with PLOS and your article meets the relevant criteria, all or part of your publication costs will be covered. Please make sure your user information is up-to-date by logging into Editorial Manager at Editorial Manager® and clicking the ‘Update My Information' link at the top of the page. If you have any questions relating to publication charges, please contact our Author Billing department directly at authorbilling@plos.org. If your institution or institutions have a press office, please notify them about your upcoming paper to help maximize its impact. If they’ll be preparing press materials, please inform our press team as soon as possible -- no later than 48 hours after receiving the formal acceptance. Your manuscript will remain under strict press embargo until 2 pm Eastern Time on the date of publication. For more information, please contact onepress@plos.org. Kind regards, Joydeep Bhattacharya Academic Editor PLOS ONE |
| Formally Accepted |
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PONE-D-24-28077R1 PLOS ONE Dear Dr. Landini, I'm pleased to inform you that your manuscript has been deemed suitable for publication in PLOS ONE. Congratulations! Your manuscript is now being handed over to our production team. At this stage, our production department will prepare your paper for publication. This includes ensuring the following: * All references, tables, and figures are properly cited * All relevant supporting information is included in the manuscript submission, * There are no issues that prevent the paper from being properly typeset If revisions are needed, the production department will contact you directly to resolve them. If no revisions are needed, you will receive an email when the publication date has been set. At this time, we do not offer pre-publication proofs to authors during production of the accepted work. Please keep in mind that we are working through a large volume of accepted articles, so please give us a few weeks to review your paper and let you know the next and final steps. Lastly, if your institution or institutions have a press office, please let them know about your upcoming paper now to help maximize its impact. If they'll be preparing press materials, please inform our press team within the next 48 hours. Your manuscript will remain under strict press embargo until 2 pm Eastern Time on the date of publication. For more information, please contact onepress@plos.org. If we can help with anything else, please email us at customercare@plos.org. Thank you for submitting your work to PLOS ONE and supporting open access. Kind regards, PLOS ONE Editorial Office Staff on behalf of Dr. Joydeep Bhattacharya Academic Editor PLOS ONE |
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