In the fish species Nothobranchius furzeri, populations with greater genetic variation show less lifespan extension from dietary restriction than genetically uniform populations, indicating that...
Mechanism
Synthesis from 1 study
When animals have very different genes, their bodies don't adjust well to eating less, so they don't live longer. Animals with nearly identical genes can fine-tune their energy use better and survive longer when food is limited.
Most probable mechanism
When food is limited, animals with many different genes have a harder time adjusting how their bodies use energy, so they don't live longer. Animals with very similar genes can fine-tune their energy use better and live longer when eating less.
Genetic variation across individuals alters the expression of nutrient-sensing pathways such as insulin/IGF-1 and AMPK signaling networks
Divergent regulation of these pathways impairs coordinated suppression of anabolic processes and activation of catabolic maintenance programs during nutrient restriction
Reduced efficiency in cellular repair, protein homeostasis, and mitochondrial adaptation diminishes the survival advantage conferred by dietary restriction
Evidence from Studies
Supporting (1)
Community contributions welcome
Neither caloric nor protein restriction increases the male lifespan of outbred short-lived fish
Contradicting (0)
Community contributions welcome
Gold Standard Evidence Needed
According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.