Egg consumption

• Eggs are flat tummy foods because they contain Vitamin B12, a vitamin that breaks down fat cells. Egg proteins help people reach satiation points quicker. People worried about increasing their cholesterol levels can remove egg yolks. For breakfast, eat an egg omelet or sandwich.
  
  

Natural Peanut Butter

• Peanut butter contains 3 mg of Vitamin E; 49 mg of magnesium; 208 mg of potassium; and 0.17 mg of Vitamin B6, according to AOL Health. The high protein content of peanut butter makes it a food that flattens tummies because people get full faster and stay full longer. Peanut butter serves as a good morning or afternoon snack.
  
  

Low-Fat Dairy

• An article in Obesity Research says women eating low-fat dairy three or four times a day lost 70 percent more fat than their non-dairy eating counterparts. The calcium found in dairy products helps burn fat, making it one of the top flat tummy diet foods. People who have problems digesting milk try plain, low-fat yogurt because it is easier to digest.
  
  

Use Heart-Healthy Oils

• Many oils contain good fat that make up a flat tummy diet. Prevention magazine's Flat Belly Diet says these oils lower bad cholesterol and have no effect on good cholesterol and contain antioxidants that reduce cancer and chronic disease risks. Olive oil is the most common and best of these oils. Other oils include flax seed, peanut, safflower, sesame, soybean, sunflower, walnut and canola. Use these oils when cooking healthy stir-fried vegetables, grilling salmon and other lean meats, preparing pasta dishes and pouring over salads.
  
  

Eat a Bowl of Oatmeal

• Oatmeal and other fiber-rich grains are flat tummy diet foods because they support digestive health. When people suffer from digestive problems like constipation, they often experience stomach bloating. Fiber pushes waste through the body, reducing the size of the stomach. Instead of using sugar, butters and creams, top oatmeal with fresh fruit, cinnamon, honey, nuts, dried raisins and flax seeds.