How many protiens are in McDonald's fries? A Nutritional Breakdown
                                
                                
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                                    4 min read                                
                            
                                A small serving of McDonald's fries contains just 3 grams of protein, a minimal amount compared to its fat and carbohydrate content. For those wondering how many protiens are in McDonald's fries, the exact number depends entirely on the size you choose, but it is never a significant source of this macronutrient.