Abstract
Low-protein diets promote metabolic health in rodents and humans, and the benefits of low-protein diets are recapitulated by specifically reducing dietary levels of the three branched-chain amino acids (BCAAs), leucine, isoleucine, and valine. Here, we demonstrate that each BCAA has distinct metabolic effects. A low isoleucine diet reprograms liver and adipose metabolism, increasing hepatic insulin sensitivity and ketogenesis and increasing energy expenditure, activating the FGF21-UCP1 axis. Reducing valine induces similar but more modest metabolic effects, whereas these effects are absent with low leucine. Reducing isoleucine or valine rapidly restores metabolic health to diet-induced obese mice. Finally, we demonstrate that variation in dietary isoleucine levels helps explain body mass index differences in humans. Our results reveal isoleucine as a key regulator of metabolic health and the adverse metabolic response to dietary BCAAs and suggest reducing dietary isoleucine as a new approach to treating and preventing obesity and diabetes.
Original language | English (US) |
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Pages (from-to) | 905-922.e6 |
Journal | Cell Metabolism |
Volume | 33 |
Issue number | 5 |
DOIs | |
State | Published - May 4 2021 |
All Science Journal Classification (ASJC) codes
- Physiology
- Molecular Biology
- Cell Biology
Keywords
- FGF21
- GCN2
- body mass index
- branched-chain amino acids
- diabetes
- insulin resistance
- isoleucine
- mTORC1
- obesity
- valine