The document analyzes the sugar content of popular breakfast cereals. It finds that Cornflakes, Nutri-Grain, and Rice Bubbles each contain 1 or more teaspoons of sugar per 50g serving. Weet-Bix contains only 1/4 teaspoon of sugar per serving, making it the cereal with the lowest sugar content. Uncle Toby's Muesli Flakes contains 2 1/2 teaspoons of sugar per 50g serving.