Well, sure, not eating might cause you to lose weight — but at what cost? (No, seriously.) If you have a propensity for disordered eating, fasting can be dangerous, and skipping meals can make you tired, cranky, listless, and lethargic — plus, you're more likely to overeat later. You need to eat! Your body uses between 1,500–2,200 calories a day just to exist and keep you breathing, thinking, and making funny jokes on the internet. Eat so you can continue breathing, thinking, and making funny jokes on the internet!