Consumer Reports rates four of 27 breakfast cereals marketed to children "very good."
Cheerios topped the list with three grams of fiber per serving and only one gram of sugar.
Kix, Honey Nut Cheerios, and Life also have relatively low amounts of sugar and high amounts of fiber.
Consumer Reports found that Post's Golden Crisp and Kelloggs' Honey Smacks contain more than 50% sugar.
When it comes to nutrition, 23 of the 27 cereals marketed to children rated "good" or "fair."