Plan ahead. If you know what you're going to eat ahead of time, you're less likely to make an unhealthy choice. 2. Bring a brown bag lunch. If you're not sure what's on the menu or you don't want to eat what's there, bring your own lunch. 3. Avoid the processed foods. The school cafeteria is likely to have a lot of processed foods, which are unhealthy and high in sugar and sodium. 4. Stick to the basics. Opt for whole grains, fruits, and vegetables instead of processed foods. 5. Get involved. If the school cafeteria has a menu or nutrition guide, take a look at it before you make your choices.