Cited by 330Diet and metabolism studiesDietary Effects on HealthMuscle metabolism and nutrition

Energy expenditure and body composition changes after an isocaloric ketogenic diet in overweight and obese men

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Hall, Kevin D, Chen, Kong Y, Guo, Juen, Lam, Yan Y, Leibel, Rudolph L, Mayer, Laurel ES, Reitman, Marc L, Rosenbaum, Michael +3 more·2016·The American Journal of Clinical Nutrition

Abstract

Background The carbohydrate-insulin model of obesity posits that habitual consumption of a high-carbohydrate diet sequesters fat within adipose tissue because of hyperinsulinemia and results in adaptive suppression of energy expenditure (EE). Therefore, isocaloric exchange of dietary carbohydrate for fat is predicted to result in increased EE, increased fat oxidation, and loss of body fat. In contrast, a more conventional view that "a calorie is a calorie" predicts that isocaloric variations in dietary carbohydrate and fat will have no physiologically important effects on EE or body fat.Objective We investigated whether an isocaloric low-carbohydrate ketogenic diet (KD) is associated with changes in EE, respiratory quotient (RQ), and body composition.Design Seventeen overweight or obese men were admitted to metabolic wards, where they consumed a high-carbohydrate baseline diet (BD) for 4 wk followed by 4 wk of an isocaloric KD with clamped protein. Subjects spent 2 consecutive days each week residing in metabolic chambers to measure changes in EE (EEchamber), sleeping EE (SEE), and RQ. Body composition changes were measured by dual-energy X-ray absorptiometry. Average EE during the final 2 wk of the BD and KD periods was measured by doubly labeled water (EEDLW).Results Subjects lost weight and body fat throughout the study corresponding to an overall negative energy balance of ∼300 kcal/d. Compared with BD, the KD coincided with increased EEchamber (57 ± 13 kcal/d, P = 0.0004) and SEE (89 ± 14 kcal/d, P < 0.0001) and decreased RQ (-0.111 ± 0.003, P < 0.0001). EEDLW increased by 151 ± 63 kcal/d (P = 0.03). Body fat loss slowed during the KD and coincided with increased protein utilization and loss of fat-free mass.Conclusion The isocaloric KD was not accompanied by increased body fat loss but was associated with relatively small increases in EE that were near the limits of detection with the use of state-of-the-art technology. This trial was registered at clinicaltrials.gov as NCT01967563.

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Authors
Hall, K. D., Chen, K. Y., Guo, J., Lam, Y. Y., Leibel, R. L., Mayer, L. E., Reitman, M. L., Rosenbaum, M., Smith, S. R., Walsh, B. T., & Ravussin, E.
Affiliations
  • National Institutes of Health (US)
  • National Institute of Diabetes and Digestive and Kidney Diseases (US)
  • Pennington Biomedical Research Center (US)
  • Columbia University (US)
  • Translational Research Institute for Metabolism and Diabetes (US)
Corresponding author
Hall, Kevin D
Venue
The American Journal of Clinical Nutrition
Publisher
Elsevier BV
Published
2016-08
Volume
104
Issue
2
Pages
324-333
ISSN
0002-9165 (ISSN-L)
OpenAlex
W2469199053
Cited by
330
References
48
Citations by year
2026: 19 · 2025: 22 · 2024: 23 · 2023: 37 · 2022: 39 · 2021: 42 · 2020: 39 · 2019: 51 · 2018: 26 · 2017: 22 · 2016: 8
FWCI
28.72
Type
journal article
Language
en
Open access
Locations
  • American Journal of Clinical Nutrition (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health (UL1 TR00040)
  • National Institute of Diabetes and Digestive and Kidney Diseases (UL1 TR00040, P30DK026687, P30DK072476)
Topics
  • Health Sciences › Medicine › Physiology › Diet and metabolism studies
  • Health Sciences › Medicine › Physiology › Dietary Effects on Health
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Muscle metabolism and nutrition
Keywords
ketogenic diet, isocaloric diet, energy expenditure, body composition, obesity, overweight men, respiratory quotient, fat oxidation, fat-free mass loss, protein utilization, weight loss
MeSH terms
Adipose Tissue, Adult, Body Composition, Energy Intake, Dietary Carbohydrates, Dietary Fats, Energy Metabolism, Humans, Male, Obesity, Weight Loss, Overweight, Diet, Carbohydrate-Restricted, Diet, Ketogenic

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