Research paper
Nedeltcheva AV, Kilkus JM, Imperial J, Schoeller DA, Penev PD. Insufficient sleep undermines dietary efforts to reduce adiposity. Ann Intern Med. 2010 Oct 5;153(7):435-441. doi:10.7326/0003-4819-153-7-201010050-00006
Why we cite it
Randomized crossover study demonstrating that sleep restriction fundamentally alters the composition of weight lost during caloric restriction. Ten overweight adults underwent 14-day periods of identical caloric deficit with either 8.5 or 5.5 hours of sleep opportunity. Total weight loss was similar in both conditions, but sleep restriction reduced fat loss by 55% (1.4 kg vs. 0.6 kg, p=0.043) while increasing fat-free mass loss by 60% (1.5 kg vs. 2.4 kg, p=0.002). This shows that sleep doesn’t just affect how much you eat — it affects what your body does with the caloric deficit. Same calories in, same weight out, but radically different body composition outcomes. Among the strongest evidence that adequate sleep is physiologically necessary for effective fat loss.
About the author
Arlet V. Nedeltcheva — MD (Medical University of Sofia, Bulgaria). At time of paper: Department of Medicine, Section of Endocrinology, University of Chicago (in Eve Van Cauter’s sleep lab). Later Visiting Scientist, Medical Chronobiology Program, Brigham and Women’s Hospital / Harvard Medical School (2013–2017). Key papers: this 2010 study, sleep curtailment and snack calorie intake (AJCN, 2009), circadian misalignment and glucose (Science Advances, 2021), late eating and metabolism (Cell Metabolism, 2022).
Plamen D. Penev (senior author/PI) — MD (Medical University of Sofia, Class of 1991). PhD Neuroscience (Northwestern University, 1995). Endocrinology Fellowship, University of Chicago (2000–02). At time of paper: Assistant Professor of Medicine, UChicago. Medical Director, Outpatient Endocrinology Clinic. Co-Director, Physiology Core, UChicago Diabetes Research & Training Center. Later transitioned to pharmaceutical industry (Bristol-Myers Squibb, then Fortrea). 34 publications, ~7,175 citations.
Dale A. Schoeller — PhD Chemistry & Geochemistry (Indiana University). Professor Emeritus of Nutritional Sciences, University of Wisconsin-Madison. Previously at University of Chicago (Stable Isotope Core Director — the UChicago connection). First to apply the doubly labeled water (DLW) method to human subjects (1982) — the gold standard for measuring free-living energy expenditure. Past President, American Society for Clinical Nutrition. Career sweep of top nutrition honors: Mead Johnson Award (1987), Herman Award, W.O. Atwater Award. ~19,200 citations, 232 publications.
DOI: 10.7326/0003-4819-153-7-201010050-00006 · PubMed 20921542 · Publisher