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Metabolic adaptation to caloric restriction and subsequent refeeding: the Minnesota Starvation Experiment revisited.
- Source :
- American Journal of Clinical Nutrition; Oct2015, Vol. 102 Issue 4, p807-819, 13p, 3 Charts, 4 Graphs
- Publication Year :
- 2015
-
Abstract
- Background: Adaptive thermogenesis (AT) is the fat-free mass (FFM)-independent reduction of resting energy expenditure (REE) to caloric restriction (CR). AT attenuates weight loss and favors weight regain. Its variance, dynamics, and control remain obscure. Objectives: Our aims were to address the variance and kinetics of AT, its associations with body composition in the context of endocrine determinants, and its effect on weight regain. Design: Thirty-two nonobese men underwent sequential overfeeding (1 wk at +50% of energy needs), CR (3 wk at 250% of energy needs), and refeeding (2 wk at +50% of energy needs). AT and its determinants were measured together with body composition as assessed with the use of quantitative magnetic resonance, whole-body MRI, isotope dilution, and nitrogen and fluid balances. Results: Changes in body weight were +1.8 kg (overfeeding), 26.0 kg (CR), and +3.5 kg (refeeding). CR reduced fat mass and FFM by 114 and 159 g/d, respectively. Within FFM, skeletal muscle (25%), liver (213%), and kidneys (28%) decreased. CR also led to reductions in REE (2266 kcal/d), respiratory quotient (215%), heart rate (214%), blood pressure (27%), creatinine clearance (212%), energy cost of walking (222%), activity of the sympathetic nervous system (SNS) (238%), and plasma leptin (244%), insulin (254%), adiponectin (249%), 3,5,3#-tri-iodo-thyronine (T3) (239%), and testosterone (211%). AT was 108 kcal/d or 48% of the decrease in REE. Changes in FFM composition explained 36 kcal, which left 72 kcal/d for true AT. The decrease in AT became significant at #3 d of CR and was related to decreases in insulin secretion (r = 0.92, P , 0.001), heart rate (r = 0.60, P , 0.05), creatinine clearance (r = 0.79, P , 0.05), negative fluid balance (r = 0.51, P , 0.01), and the free water clearance rate (r = 20.90, P , 0.002). SNS activity and plasma leptin, ghrelin, and T3 and their changes with CR were not related to AT. Conclusion: During early weight loss, AT is associated with a fall in insulin secretion and body fluid balance. This trial was registered at clinicaltrials.gov as NCT01737034. [ABSTRACT FROM AUTHOR]
- Subjects :
- BODY fluid analysis
SYMPATHETIC nervous system physiology
ENDOCRINE system physiology
LIVER analysis
PHYSIOLOGICAL adaptation
ADIPOSE tissues
ANALYSIS of variance
BASAL metabolism
BLOOD pressure measurement
BODY composition
BODY temperature regulation
BODY weight
CALORIMETRY
CLINICAL trials
COLLEGE students
STATISTICAL correlation
CREATININE
DIET in disease
DIET therapy
ENERGY metabolism
HEART rate monitoring
INGESTION
INSULIN
ISOTOPES
MAGNETIC resonance imaging
MATHEMATICS
NITROGEN
NUTRITIONAL assessment
PLETHYSMOGRAPHY
PROBABILITY theory
REGRESSION analysis
RESEARCH evaluation
RESEARCH funding
RESPIRATORY quotient
STATISTICS
TESTOSTERONE
URINALYSIS
WALKING
WATER-electrolyte balance (Physiology)
WEIGHT gain
LEPTIN
DATA analysis
GHRELIN
BODY mass index
ACCELEROMETRY
REPEATED measures design
LEAN body mass
PHYSICAL activity
DATA analysis software
ADIPONECTIN
SKELETAL muscle
DESCRIPTIVE statistics
Subjects
Details
- Language :
- English
- ISSN :
- 00029165
- Volume :
- 102
- Issue :
- 4
- Database :
- Complementary Index
- Journal :
- American Journal of Clinical Nutrition
- Publication Type :
- Academic Journal
- Accession number :
- 110276530
- Full Text :
- https://doi.org/10.3945/ajcn.115.109173