Dietary restriction promotes longevity but impairs fecundity in many organisms. When the amino acids in a diet are fine-tuned, however, lifespan can be increased without loss of fecundity — at least in fruitflies.
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Flatt, T. Diet and longevity in the balance. Nature 462, 989–990 (2009). https://doi.org/10.1038/462989a
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Erratum to: Lifespan modification by glucose and methionine in Drosophila melanogaster fed a chemically defined diet