What is Counting Macros?
Macro counting is when you track your intake of carbohydrates, fat, and protein. Usually, what your actually counting is grams.
Moreover, carbs, fat, and protein have a fixed number of calories per gram. So by tracking macros, you also control your calorie intake.
However, not all calories are created equal. For example, 25 grams of high glycemic carbs have a much different effect on blood sugar than 25 grams of fat or protein.
Therefore, by targeting macros you also manage the effect food has on your body. In that way, you make it easier to burn fat and build muscle.