The relationship between energy intake and brain size is a bell curve: chronic caloric excess leaves you with a smaller brain, just as chronic restriction does.

Associate professor at the University of Washington

And what they found is there's kind of this um bell-shaped curve between energy availability and brain volume. And in general, brain volume, right, the more the better, right, we think. And so if you're chronically calorically restricted, your brain is smaller um because you just don't have the resources to invest in, you know, the structure um and to maintain it. At the other end, you see the same thing. So if you're chronically in a chronic state of chloric excess, you also tend to have a smaller brain on average.