What Carb Has the Highest Protein? The Answer is Soybeans
                                
                                
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                                    3 min read                                
                            
                                According to the USDA, a 1-cup serving of cooked soybeans contains approximately 28.62 grams of protein. This makes the soybean the highest-protein carbohydrate, offering a powerful combination of both macronutrients in a single, plant-based food.