Your brain, your body... Yeah, your brain prioritizes nutrients in the brain over it. It basically protects your body. So if you take an animal and you fast it for two days, a mouse, it loses a lot of weight, 25% of its weight. And now you take every single tissue and you weigh it, every tissue has shrunk. Except the brain. Some, like the thymus, have shrunk ridiculously. The kidney shrinks, which you wouldn't expect. The heart shrinks. The brain, nothing.