[Fractal Trader]

Remember, you can only consume 40% of your caloric intake in proteins

I'd like to consider myself nutritionally aware, but I hadn't heard of this one, except once. It was the book Into The Wild, where is suggested that his diet of ground animals was making him skinny because the animals didn't have enough fat.

[muawiyah]

Every time you run into any serious work on “The Donner Party” you’ll find it. They had plenty of protein, but not nearly enough non-fats.

[WVKayaker]

... his diet of ground animals was making him skinny ...