The rat is designed to live about three years, its heart races, its body is hot. It eats almost non-stop. There is little room for starvation in rat DNA. The species benefits from massive die-offs when supply is short. It's in a rat's favor to die of starvation. There is no validity in any study that compares rat metabolism to human metabolism. Rats also die on a high-fat diet, because they are designed to eat grains - the opposite of what we're designed to eat! I don't see how a rat thymus tells us diddly about the impact of human fasting. What of apex predators? Does the wolf thymus break down constantly between meals?
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.