To prevent yourself from overeating, divide your food into smaller portions (for instance, put some on a small side dish or two). Subconsciously, each empty plate cues you to slow down. Yale University researchers took a tube of potato chips and colored each seventh or fourteenth one red. Snackers who encountered these "stop signs" ate less than half as many chips as those without prompts
. They were also more accurate at estimating how much they ate.