Choosing the right high fiber cereal can be a great way to get good carbs into your diet. Pick cereals with at least 7 grams of fiber per serving. Eating cereal may be the easiest way to get fiber in a small package. Not only is fiber a cancer fighter, but it actually cancels out some of the calories you eat! For example, if you eat 30 grams of fiber a day, which is slightly more than double what most people get, your body will absorb 120 fewer calories a day. That is 13lbs per year that your body is not absorbing.