Do lower-carbohydrate diets increase total energy expenditure? An updated and reanalyzed meta-analysis of 29 controlled-feeding studies
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BACKGROUND: The effect of macronutrient composition on total energy expenditure (TEE) remains controversial, with divergent findings among studies. One source of heterogeneity may be study duration, as physiological adaptation to lower carbohydrate intake may require 2 to 3 wk. OBJECTIVE: We tested the hypothesis that the effects of carbohydrate [expressed as % of energy intake (EI)] on TEE vary with time. METHODS: The sample included trials from a previous meta-analysis and new trials identified in a PubMed search through 9 March 2020 comparing lower- and higher-carbohydrate diets, controlled for EI or body weight. Three reviewers independently extracted data and reconciled discrepancies. Effects on TEE were pooled using inverse-variance-weighted meta-analysis, with between-study heterogeneity assessed using the I2 statistic. Meta-regression was used to quantify the influence of study duration, dichotomized at 2.5 wk. RESULTS: The 29 trials ranged in duration from 1 to 140 d (median: 4 d) and included 617 participants. Difference in carbohydrate between intervention arms ranged from 8% to 77% EI (median: 30%). Compared with reported findings in the prior analysis (I2 = 32.2%), we found greater heterogeneity (I2 = 90.9% in the reanalysis, 81.6% in the updated analysis). Study duration modified the diet effect on TEE (P < 0.001). Among 23 shorter trials, TEE was reduced on lower-carbohydrate diets (-50.0 kcal/d; 95% CI: -77.4, -22.6 kcal/d) with substantial heterogeneity (I2 = 69.8). Among 6 longer trials, TEE was increased on low-carbohydrate diets (135.4 kcal/d; 95% CI: 72.0, 198.7 kcal/d) with low heterogeneity (I2 = 26.4). Expressed per 10% decrease in carbohydrate as %EI, the TEE effects in shorter and longer trials were -14.5 kcal/d and 50.4 kcal/d, respectively. Findings were materially unchanged in sensitivity analyses. CONCLUSIONS: Lower-carbohydrate diets transiently reduce TEE, with a larger increase after ∼2.5 wk. These findings highlight the importance of longer trials to understand chronic macronutrient effects and suggest a mechanism whereby lower-carbohydrate diets may facilitate weight loss.
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Low- compared with high-carbohydrate diets also increase total energy expenditure after 2-3 wk.
“Low- compared with high-carbohydrate diets also increase total energy expenditure after 2–3 wk (100).”
From The carbohydrate-insulin model: A physiological perspective on the obesity pandemic (2021) · cites this paper as [100]
In a recent meta-analysis, low- compared with high-carbohydrate diets slightly reduced energy expenditure in trials <2.5 weeks, but low-carbohydrate diets increased energy expenditure in longer trials.
“In a recent meta-analysis, low- compared with high-carbohydrate diets slightly reduced energy expenditure in trials < 2.5 wk, but low-carbohydrate diets increased energy expenditure in longer trials (100).”
From The carbohydrate-insulin model: A physiological perspective on the obesity pandemic (2021) · cites this paper as [100]
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- [53]Dickinson S, Ludwig D, Ebbeling C, Allison D, Henschel B. Do lower-carbohydrate diets increase total energy expenditure? An updated and reanalyzed meta-analysis of 29 controlled feeding studies. Open Science Framework. 2020; [Internet]. [Accessed 2020 Nov 24]. Available from: https://osf.io/2hyqr/. PMC7948201 33274750
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- Authors
- Ludwig, D. S., Dickinson, S. L., Henschel, B., Ebbeling, C. B., & Allison, D. B.
- Affiliations
- Boston Children's Hospital (US)
- Indiana University Bloomington (US)
- Corresponding author
- Ludwig, David S
- Venue
- The Journal of Nutrition
- Publisher
- Elsevier BV
- Published
- 2021-03
- Volume
- 151
- Issue
- 3
- Pages
- 482-490
- ISSN
- 0022-3166 (ISSN-L)
- PMC
- PMC7948201
- OpenAlex
- W3110348447
- Cited by
- 71
- References
- 68
- Citations by year
- 2026: 4 · 2025: 9 · 2024: 10 · 2023: 13 · 2022: 12 · 2021: 20 · 2020: 3
- FWCI
- 1.53
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Licence
- Locations
- Journal of Nutrition (publishedVersion, cc-by-nc)
- PubMed Central (publishedVersion, cc-by-nc)
- PubMed (publishedVersion)
- OSF Preprints (OSF Preprints) (submittedVersion)
- Funders
- New Balance Foundation
- 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
- low-carbohydrate diet, total energy expenditure, macronutrient composition, carbohydrate intake, study duration, physiological adaptation, energy balance, controlled feeding study, meta-analysis heterogeneity, weight maintenance, weight loss maintenance, weight gain prevention
- MeSH terms
- Diet, Carbohydrate Loading, Duration of Therapy, Body Weight, Energy Intake, Clinical Trials as Topic, Dietary Carbohydrates, Energy Metabolism, Humans, Obesity, Diet, Carbohydrate-Restricted
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