The chaostician is right.
Consider yet another example.
Fat is in food – in fact, fat is an important contributor to the best taste of some of the best foods.
Nature was bound to find a way to put the fat to good use.
If nature did find a way, and especially if nature found lots of ways to put fat, even a lot of fat, to good uses, a diet that is nearly as fat-free as Pritikin’s and his myrmidons’, is far from optimal.
If nature found a way, as it usually does, Pritikin’s diet and the vegan diet are not bulls-eye diets.