>The effect of consuming an old versus a young diet, he says, was “statistically significant, but it wasn’t huge. Honestly, I thought it would have a much large

>The effect of consuming an old versus a young diet, he says, was “statistically significant, but it wasn’t huge. Honestly, I thought it would have a much larger effect on lifespan, but it was on the order of about 10 percent.” There is an effect that works in the opposite direction that might explain why the effect was smaller than expected: Younger organisms (presumably) have a higher percentage of inflammatory amino acids than older organisms and restriction of some of these is known to extend life. Methionine restriction has been established I think. In the other direction, Ray Peat claims that a higher percentage of older organisms is collagen. The consumption of collagen (bone broth for example) is possibly life extending.