You're not tracking down a mastodon for 20 miles with a few of your friends, only to catch up with it and kill it with spears, all in one day. You're getting low-quality meat and cramming way too much of it in your face. High protein/low-carb diets really miss the point to health. Also, humans seem to have adapted quickly (quickly from an evolutionary perspective) to a diet that includes grains. I digest whole wheat just fine, and I get plenty of nutrients from that foodstuff.
As Martian said, eat right and exercise. This means fruits, veggies, lean meats, whole grains, all balanced along with at least 30 minutes a day of exercise. That's the whole ballgame.
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