Elevated branched-chain amino acids (BCAAs) are associated with obesity and insulin resistance. How long-term dietary BCAAs impact late-life health and lifespan is unknown. Here, we show that when dietary BCAAs are varied against a fixed, isocaloric macronutrient background, long-term exposure to high BCAA diets leads to hyperphagia, obesity and reduced lifespan. These effects are not due to elevated BCAA per se or hepatic mammalian target of rapamycin activation, but instead are due to a shift in the relative quantity of dietary BCAAs and other amino acids, notably tryptophan and threonine. Increasing the ratio of BCAAs to these amino acids results in hyperphagia and is associated with central serotonin depletion. Preventing hyperphagia by calorie restriction or pair-feeding averts the health costs of a high-BCAA diet. Our data highlight a role for amino acid quality in energy balance and show that health costs of chronic high BCAA intakes need not be due to intrinsic toxicity but instead are a consequence of hyperphagia driven by amino acid imbalance.
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RNA-seq data have been deposited with the Gene Expression Omnibus and are accessible through accession number GSE114855. The data that support the plots within this article and other findings of this study are available from the corresponding author upon reasonable request.
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We thank F. Held and P. Telleria Teixeira for their technical and administrative support. We thank the Laboratory Animal Services at the University of Sydney, N. Sunn of Sydney Imaging, W. Potts from Specialty Feeds, L. McQuade from the Australian Proteome Analysis Facility and the Diagnostic Pathology Unit at Concord Hospital. This work is supported by a National Health and Medical Research Council (NHMRC) project grant (GNT1084267 to D.R., D.L.C. and S.J.S.), the Ageing and Alzheimers Institute and the Sydney Food and Nutrition Network. S.S.B. is supported by the NHMRC Peter Doherty Biomedical Fellowship (no. GNT1110098) and the University of Sydney SOAR fellowship. A.M.S. was supported by a Discovery Early Career Researcher Award from the Australian Research Council (DE180101520). V.C.C. is supported by a University of Sydney Equity Fellowship. L.P. and P.J. were supported by the Max Planck Society and acknowledge funding from the European Research Council under the European Union’s Seventh Framework Programme (FP7, 2007–2013)/ERC grant agreement no. 268739 and the Wellcome Trust (098565/Z/12/).
The authors declare no competing interests.
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Solon-Biet, S.M., Cogger, V.C., Pulpitel, T. et al. Branched-chain amino acids impact health and lifespan indirectly via amino acid balance and appetite control. Nat Metab 1, 532–545 (2019). https://doi.org/10.1038/s42255-019-0059-2
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