Oats are a classic muscle building food. Steel cut oats are a less processed and more flavorful version. A quarter cup of steel cut oats contains 5 grams of fiber. Oats also contain a super fiber called beta-glucan. Beta-glucan is the fiber that gives oats its cholesterol lowering effect. It is the beta-glucan in oats that will also help slow the digestion of your meal down, allowing you to feel satisfied for several hours.