About the Authors

Gerlof A. R. Reckman

Roles Conceptualization, Data curation, Formal analysis, Investigation, Methodology, Project administration, Resources, Visualization, Writing – original draft, Writing – review & editing

g.a.r.reckman@pl.hanze.nl

Affiliations Department of Internal Medicine, Division of Nephrology, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands, Research Group Healthy Ageing, Allied Health Care and Nursing, Centre of Expertise Healthy Ageing, Hanze University of Applied Sciences, Groningen, the Netherlands

Gerjan J. Navis

Roles Conceptualization, Supervision, Writing – review & editing

Affiliation Department of Internal Medicine, Division of Nephrology, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands

Wim P. Krijnen

Roles Formal analysis, Supervision, Visualization, Writing – review & editing

Affiliation Research Group Healthy Ageing, Allied Health Care and Nursing, Centre of Expertise Healthy Ageing, Hanze University of Applied Sciences, Groningen, the Netherlands

Roel J. Vonk

Roles Conceptualization, Resources, Supervision, Writing – review & editing

Affiliation Department of Cell Biology, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands

Harriët Jager-Wittenaar

Roles Conceptualization, Supervision, Writing – review & editing

Affiliations Research Group Healthy Ageing, Allied Health Care and Nursing, Centre of Expertise Healthy Ageing, Hanze University of Applied Sciences, Groningen, the Netherlands, Department of Maxillofacial Surgery, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands

Cees P. van der Schans

Roles Conceptualization, Supervision, Writing – review & editing

Affiliations Research Group Healthy Ageing, Allied Health Care and Nursing, Centre of Expertise Healthy Ageing, Hanze University of Applied Sciences, Groningen, the Netherlands, Department of Rehabilitation, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands, Department of Health Psychology, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands

Competing Interests

I have read the journal's policy and the authors of this manuscript have the following competing interests: The naturally enriched 13C-milk protein has been made available as an in kind contribution by Hanze Nutrition B.V., which is owned by co-author prof. dr. R.J. Vonk. This does not alter our adherence to PLOS ONE policies on sharing data and materials.