"When you begin to eat, your eyes, hands and mouth start the chain of command. Then the brain kicks in. Sugar and starch spur serotonin, a neurotransmitter known to increase a sense of well-being. (It's what makes Prozac work.) Salty foods spur oxytocin, aka the "cuddle chemical," a hormone that is also spiked by hugs and orgasm." (Quoted from article)