yes. A very significant health issue: Leukemia.
What do I think about T.Colin Campbell's findings about animal protein in The China Study?
I agree with him, but only if the diet is heavily-laden with animal proteins, or are allowed to play a major part in ones diet such as in the Atkins Diet.
Too much protein overloads the kidneys with uric acid (a by product) so is not recommended.
We should also bear in mind that the original Hunzas ate meat as a very small % of their diets, and were some of the longest lived peoples in the World.
A plant-based diet is the ideal (in my opinion) and I mean plant-based, and not exclusively plant-based.
What I think is more significant is a low calorie or Calorie-Restricted diet for health and longevity, as evidenced by Luigi Cornaro who ate some meat as part of his CR diet, and lived to be a very healthy 102 years of age.