Don't Eat It Just Because "It's Good For Me"

At the movies I overheard a woman say she force fed herself dark chocolate every night (until she couldn't eat any more) because "I know it's good for me." Don't ever use this as a reason to eat something (especially chocolate), unless you have a medical condition. This leads to very unhealthy behaviors and, even worse, unhealthy attitudes towards food. Eat because you want to. If it happens to be good for you, that's a bonus.