Impaired Metabolic Flexibility to High-Fat Overfeeding Predicts Future Weight Gain in Healthy Adults
Open accessAbstract
The ability to switch fuels for oxidation in response to changes in macronutrient composition of diet (metabolic flexibility) may be informative of individuals’ susceptibility to weight gain. Seventy-nine healthy, weight-stable participants underwent 24-h assessments of energy expenditure and respiratory quotient (RQ) in a whole-room calorimeter during energy balance (EBL) (50% carbohydrate, 30% fat) and then during 24-h fasting and three 200% overfeeding diets in a crossover design. Metabolic flexibility was defined as the change in 24-h RQ from EBL during fasting and standard overfeeding (STOF) (50% carbohydrate, 30% fat), high-fat overfeeding (HFOF) (60% fat, 20% carbohydrate), and high-carbohydrate overfeeding (HCOF) (75% carbohydrate, 5% fat) diets. Free-living weight change was assessed after 6 and 12 months. Compared with EBL, RQ decreased on average by 9% during fasting and by 4% during HFOF but increased by 4% during STOF and by 8% during HCOF. A smaller decrease in RQ, reflecting a smaller increase in lipid oxidation rate, during HFOF but not during the other diets predicted greater weight gain at both 6 and 12 months. An impaired metabolic flexibility to acute HFOF can identify individuals prone to weight gain, indicating that an individual’s capacity to oxidize dietary fat is a metabolic determinant of weight change.
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Overfeeding with fat decreases carbohydrate oxidation without discernible alteration in fat oxidation.
“Experiments on overfeeding with fat demonstrate that an abundance of fat decreases the oxidation of carbs without any discernible alteration in fat oxidation.”
From Nutritional and herbal interventions for polycystic ovary syndrome (PCOS): a comprehensive review of dietary approaches, macronutrient impact, and herbal medicine in management (2025) · cites this paper as [95]
The Results (Metabolic Flexibility to 24-h Fasting and Overfeeding Diets) support the decrease in carbohydrate oxidation during high-fat overfeeding, but directly contradict the claim that fat oxidation did not change: lipid oxidation increased by 31% compared with energy balance. (LLM, conf=0.94)
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Experimental — accuracy not yet measuredOverabundance of carbohydrates or inadequate carbohydrate oxidation elevates fat accumulation via the de novo lipogenesis pathway.
“The overabundance of carbs or inadequate carbohydrate oxidation results in an elevation of fat accumulation via the de novo lipogenesis pathway [95].”
From Nutritional and herbal interventions for polycystic ovary syndrome (PCOS): a comprehensive review of dietary approaches, macronutrient impact, and herbal medicine in management (2025) · cites this paper as [95]
The Discussion (page unavailable) links future weight gain to impaired lipid oxidation during high-fat overfeeding, not to inadequate carbohydrate oxidation. Searches for de novo lipogenesis and excess carbohydrates found no passage in our copy connecting either to fat accumulation through that pathway. (LLM, conf=0.73)
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Cited by
Sorted by citations
Christoffersen, B. Ø., Sanchez‐Delgado, G., John, L. M., Ryan, D. H., Raun, K., & Ravussin, E. (2022) · Obesity · doi:10.1002/oby.23374 · Cited by 142 · see citing works
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“The overabundance of carbs or inadequate carbohydrate oxidation results in an elevation of fat accumulation via the de novo lipogenesis pathway [95].”
- Authors
- Begaye, B., Vinales, K. L., Hollstein, T., Ando, T., Walter, M., Bogardus, C., Krakoff, J., & Piaggi, P.
- Affiliations
- National Institutes of Health (US)
- University of Pisa (IT)
- Corresponding author
- Piaggi, Paolo
- ORCID
- Venue
- Diabetes
- Publisher
- American Diabetes Association
- Published
- 2019-11-11
- Volume
- 69
- Issue
- 2
- Pages
- 181-192
- ISSN
- 0012-1797 (ISSN-L)
- 1939-327X
- PMC
- PMC6971489
- OpenAlex
- W2988593428
- Cited by
- 73
- References
- 6
- Citations by year
- 2026: 5 · 2025: 11 · 2024: 12 · 2023: 16 · 2022: 11 · 2021: 12 · 2020: 6
- FWCI
- 5.88
- Type
- journal article
- Language
- en
- Update notices
- correction (2021-04-01)
- Open access
- bronze
- doi.org
- Locations
- Diabetes (publishedVersion)
- Europe PMC (PubMed Central) (publishedVersion)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- CINECA IRIS Institutial research information system (University of Pisa) (submittedVersion, other-oa)
- Funders
- National Institute of Diabetes and Digestive and Kidney Diseases (DK-069029-11)
- Topics
- Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diet, Metabolism, and Disease
- Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes, Cardiovascular Risks, and Lipoproteins
- Health Sciences › Medicine › Physiology › Dietary Effects on Health
- Keywords
- metabolic flexibility, weight gain prediction, respiratory quotient, lipid oxidation, energy expenditure, macronutrient composition, fasting, energy balance, obesity susceptibility, healthy adults
- MeSH terms
- Adolescent, Adult, Dietary Carbohydrates, Dietary Fats, Energy Metabolism, Fasting, Female, Humans, Male, Middle Aged, Weight Gain, Young Adult
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