3. Eat!

When you eat, your intestines release a number of hormones, like peptide 1, peptide YY, glucagon, and cholecystokinin. Say that ten times fast! These hormones slow the movement of food through your digestive system. Eat plenty of vegetables and lean proteins, like eggs, fish, and poultry.

4. Eat seafood.

Seafood is rich in iodine, which is necessary for your thyroid to function. Your thyroid produces hormones, like T3 and T4, which control how many calories you burn while you're just sitting around. If you suddenly start gaining weight, consider that you may not be getting enough iodine.