Fair enough, I think nutritional science is in its nascent stages, so the whole thing is pretty vague and on shaky ground. However, some cursory empirical evide

Fair enough, I think nutritional science is in its nascent stages, so the whole thing is pretty vague and on shaky ground. However, some cursory empirical evidence does back most of his claims around fat gain. At least to my armchair-nutritionist satisfaction. Anecdata, everyone's favorite - I've seen someone gain no weight eating near 100% protein, while way over their TDEE. Kid you not, 4000 kcal of lean protein and mustard. Also morbidly, you've got alcoholics (spirits), also traditionally under weight while consuming far in excess of their TDEE in ethanol (7 kcal per gram). So some of it can be tested in the field!