For men, losing a lot of body fat in spring and summer could easily lead to better hunting abilities. Running around with 10 or 20 pounds of flab is great in the winter, but not so hot when you're trying to sneak up on, run after or wrestle animals. I subscribe to the seasonal weight gain idea. Which is why I don't freak out if, sometimes, I look in the mirror and can't see all my trunk muscles. It's only a few pounds, it comes and goes, and it never stays for very long. Stress is far worse than being marginally overweight and arguably worse than (most) poor food choices. Though I doubt a good mood will save you if you're living on microwave dinners and mountain dew.
Steak, eggs, potatoes - fruits, nuts, berries and forage. Coconut milk and potent herbs and spices. Tea instead of coffee now and teeny amounts of kelp daily. Let's see how this does! Not really had dairy much, and gut seems better for it.