20. b (All-Bran). Researchers who pooled ten studies that tracked more than 300,000 people for 6 to 10 years found a lower risk of heart disease among those who ate more total fiber. All-Bran has more (10 grams per serving) than the other cereals (3 grams). The soluble fiber in Cheerios (1 gram per cup) does lower LDL ("bad") cholesterol, but not as much as ads suggest. When people ate 3 cups a day, their cholesterol dropped an average of 7 points. But that's 420 calories' worth of food (3 cups of Cheerios plus 11/2 cups of fat-free milk).

All-Bran isn't the only high-fiber cereal. Look for any whole-grain cereal with at least 5 grams of total fiber per serving. Examples: raisin bran, shredded wheat, bran flakes, Grape-Nuts (not Flakes), and General Mills Fiber One.