Short for “macronutrients,” the macros in your food can be divided into three categories: protein, fats, and carbohydrates. Some diet plans focus not only on calories but also on macros. This stems from the philosophy that you need the right balance of calories from each of the three macro groups.;You may have heard of the 40/30/30 diet, or Zone diet. This eating plan is based on the notion that your daily food intake should comprise 40% carbs, 30% protein, and 30% healthy fats. Some meal replacement bar recipes adhere to the 40/30/30 macro ratio.