What are macros? An exercise and nutrition scientist explains

"I'm tracking my macros." Protein and carbohydrates each have 4 calories per gram, while fat has 9 calories per gram. What macros do and where to find them Beyond its job building muscle, protein also plays other critical roles in the body: as a component of enzymes, transporting nutrients and producing hormones. While animal sources have the highest protein content, plant food sources, such as whole grains, legumes such as beans, and nuts and seeds also contain protein. For example, 2,000 calories of junk food and soda are not going to help with appetite control the same way that 2,000 calories of fruits and vegetables, whole grains, healthy fats and lean proteins will.