A nutritious or non-nutritious compound present in foods has your intrinsic characteristics and your power to effect changes in human health is impressive, either positively or negatively. However, this effect depends on multiple factors, it can not be taken in isolation. It is the beauty of science, to discover how it interacts with other elements and the human organism. It is incredible to see that the behavior of the same compound of a food can benefit in the fight against cancer to someone, while another person can harm it, due to genetic polymorphisms. Science never stops, fortunately!
What today is a truth, tomorrow may not be true, at least for some.