The link between animal protein was investigated in some detail in the China Study. Also in the documentary Forks Over Knives. Evidence found that there were “diseases of the west” that correlated with the western diet. Since then, the Cleveland Clinic has used plant-based diets to reverse heart disease successfully. Other programs use it reverse heart disease.
The book How Not to Die covers many of the top killer diseases in the US and what food are best and worst to eat to avoid those fates based on reviews of scientific literature. The trend thoughtout is that plant-based diets fare best. Not surprising that this correlates with Blue Zone diets.
The book Fiber Fueled looks the science of gut health and what foods are best for gut health. The answer: a variety of plant foods.
As a study size of one, I’ve personally been able to recover quickly enough to do 6 26.2+ mile runs in six months in my forties. I think that would difficult and injury prone on a high-inflammation diet.