Post Grape Nuts cereal is power packed nutrition for your action-packed day. Grape Nuts Provides 100% of your day's whole grain; Just one serving offers: 8 grams of protein: Protein uses 25% more energy to digest, compared to fats and carbohydrates, thus helping you burn more calories. Excellent source of fiber: Fiber helps support healthy glucose and cholesterol levels and keeps you feeling fuller for longer. 49 grams of whole grains