what food is a good source of fiber
1 Soluble fiber. 2  This type of fiber dissolves in water to form a gel-like material. 3  It can help lower blood cholesterol and glucose levels. 4  Soluble fiber is found in oats, peas, beans, apples, citrus fruits, carrots, barley and psyllium. This type of fiber dissolves in water to form a gel-like material. 2  It can help lower blood cholesterol and glucose levels. 3  Soluble fiber is found in oats, peas, beans, apples, citrus fruits, carrots, barley and psyllium.