It is about how to use stress productively, rather that letting it kill you. We are besieged by nutritional advice as though food were the only important factor in our health to the point where it seems the only safe course is to become an Airian. We are taught to regard butter as deadly, meat as lethal, and enjoyment of food as evil. I do not believe that nearly enough emphasis is placed on the effects of stress. All this obsession with food overlooks some powerful, fundamental physiological processes that have a much greater effect on our health than what we eat.
Humans are omnivores.
We are designed to eat pretty much whatever is available, and make good use of it, not unlike goats. This is why food arguments are so unresolvable. We can exist quite nicely on a vegetarian diet. Or a meat diet. Or a dairy diet.