... most of the triglycerides we use for activity come either from the food we eat- in other words, we use them before they're stored in our fat cells- or from the fat cells themselves. ... 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...