Department of Public Health and Caring Sciences/Clinical Nutrition and Metabolism, Uppsala University, Uppsala Science Park, 751 85, Uppsala, Sweden. Asa.von.berens@pubcare.uu.se. Nutrition, Exercise Physiology, and Sarcopenia Laboratory, Jean Mayer USDA Human Nutrition Research Center on Aging, Tufts University, Boston, MA, USA. Department of Laboratory Medicine, Karolinska Institute, Stockholm, Sweden. Department of Food studies, Nutrition and Dietetics, Uppsala University, Uppsala, Sweden. Harvard Medical School, Boston, MA, USA. Division of Gerontology, Beth Israel Deaconess Medical Center, Boston, MA, USA. Institute for Aging Research, Hebrew SeniorLife, Boston, MA, USA. Department of Public Health and Caring Sciences/Clinical Nutrition and Metabolism, Uppsala University, Uppsala Science Park, 751 85, Uppsala, Sweden.