Macro nutrients. Basically they are the grams of protein, fat, and carbs that make up your calories. Depending on your body type, age, sex, etc, there is a balance of how you want to ultimately get your daily cal total. For instance, I currently get about 40% from protein, 27% fat, and 33% carb on most days, with the carbs and fat fluctuating a little here and there for a cycle thing I do.