Protein Density

Protein density is protein relative to calories — grams per 100 kcal is a clean way to express it — and it is the single number that separates a real protein snack from a dessert wearing the label. A bar with 20g of protein and 400 calories is a different product from one with 20g and 200. We compute density where the comparison matters, because "high protein" on the front says nothing until you see what rides alongside it in sugar and fat.