How large is one serving of fruit loops? The Definitive Guide to Froot Loops Portions
                                
                                
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                                    4 min read                                
                            
                                According to the official Kellogg's nutrition label, a single, dry serving of Froot Loops is 1 1/3 cups, which weighs 39 grams. This is often a much smaller amount than what fills the average cereal bowl, highlighting a common form of portion distortion that can lead to consuming more calories and sugar than intended when trying to figure out how large is one serving of fruit loops.