But this system—with the stomach acting as both brake and accelerator on our appetite—was built for our ancestors. They’d chew some tubers, or meat, thanks to the stomach telling their brain that this was good. Then they’d eventually stop, short of busting their gut, thanks to the stomach telling the brain that they’d had enough. That happens to us, too, when we eat the same kinds of food as they did: whole grains, fibrous vegetables, things with lots of water in them.
