Eating very few carbs and lots of protein might make your body less sensitive to insulin — not because it's broken, but because it's adapting to save glucose when carbs are scarce, like in ancient times.

Back when humans were hunters during the Ice Age, their bodies might have adapted to use less insulin so their brains and babies could keep getting enough sugar — and that same trait might still be common in people whose ancestors lived that way.

When people who lost weight eat more protein, their bodies use more of that protein for energy and repair, rather than storing it.

If you're overweight and have type 2 diabetes, eating fewer carbs and more protein for 6 weeks can slightly lower your blood sugar better than the usual diabetes diet—even if you lose the same amount of weight—because your blood sugar stays more stable throughout the day.