Sodium makes your body hold on to fluid. That can raise your blood pressure, cause swelling in your legs, or make it hard to breathe. Most of your sodium comes from salt. Don't cook with it, and don’t add it to food before you eat, either. Instead, use herbs or no-salt seasoning. Choose fresh vegetables. If you use canned or frozen veggies, make sure they’re unsalted. Also, look for low-sodium foods at the store.