Add to that the fact that biology is mindbogglingly complicated. Different genetics, epigenetics, microbiome, food supplier, or other environmental factors coul

Add to that the fact that biology is mindbogglingly complicated. Different genetics, epigenetics, microbiome, food supplier, or other environmental factors could cause completely different effects with the same exact intervention. It's hard or impossible to isolate individual effects in such a large multivariate system with very nonlinear interactions.