Froot Loops, those colorful rings floating in the cereal bowls of kids and adults alike for 55 years, haven't changed all that much since their debut. Aside from a couple of new colors, the addition ...

A single serving of Kellogg's Froot Loops cereal clocks in at one and one-third cups, weighs 39 grams, and contains 150 calories, according to the nutrition facts printed on the side of the box.