With the sort of acid/alkaline balance Marty's talking about--in the extreme, maybe there's a point. Kids on a diet that's 90 percent fat--unless you go out of your way to ensure sufficient mineral content, the diet's liable to be deficient. Pair that with water restriction to concentrate the urine and give the illusion of increased ketosis, as was done early on, it's no wonder if some kids got kidney stones.

Lactic acid to heart disease looks like a real rabbit hole. Starting with giving rabbits atherosclerosis by increasing lactic acid levels. Being a rabbit seems to be a major risk factor.