>> does the stomach tell me i'm hungry or the brain? >> it's your brain that tells you you're hungry. but we think of the stomach as our second brain because your intestinal tract actually produces more chemicals that work on the brain than the brain does itself. so your body is really one system. i think of your brain as the supercomputer that is running everything, but it's all kper connected. >> larry: so would the brain tell me to overeat? >> sometimes it does. if people have damage to some parts of the brain, it can have faulty signals, we were just discussing a case of a woman that was 490 pounds and had a lap band and she was 280 and she couldn't move lower on the scale with it so they experimented with deep brain stimulation and running wires to certain parts of the brain to help her to feel a lack of craving, feels satiation, it shows some progress, but what are the