Sometimes it’s because something tastes good. Other times, it’s due to stress or anxiety. Occasionally, it’s just a mindless habit. But chances are, you’ve overeaten at some point. 

Why? “It takes about 20 minutes for your stomach to send a signal to your brain letting it know that you’re full,” says Erma Levy, a senior research dietitian at MD Anderson.  

Eating beyond that point can lead to unwanted weight...