... you can think of They're also increasingly rare in the foods we eat, compared with the foods our ancestors enjoyed. To get them these days, you must either eat a lot of fish ... deck of cards. That's 21 grams of protein, roughly. Now picture a steak the size of two decks of cards- side-by-side, in the case of a sirloin; on top of each other, if ... game typically ate. Since they were more worried about survival than about the size of their waistlines, they ate all parts of the animals they killed, including the fat-rich brains and...