Macronutrient chart shows the content of protein, carbohydrates and fats in the food. These are the nutrients that give us energy. The most energy dense macronutrient is fat. It contains 9 calories per gram. Carbohydrates and Protein both contain 4 calories per gram. This chart also shows the quantity of water in the food. A lot of sources ignore the quantity of water in the food which clearly is wrong. Ignoring the water restricts us from seeing the real density of macronutrients in the food.