There's evidence on both sides, but I'll say this...it's good for the soul, and if it's good for the soul, then it can't be half bad.
This is usually a phrase that's used to shut down scientific research. Although one can find evidence for almost everything, it's entirely permissable, and good to try to balance up all the evidence and figure out which side is more correct.
Certainly better than assuming we know something to be true that later turns out to be unsupported, eg. high fat diets causing to high fat humans.