What the hell is a macronutrient?
"Macronutrients are the main sources of calories in our diets (proteins, fats, carbs)," says dietitian Jim White, owner of Jim White Fitness and Nutrition Studios. "These are the nutrients that we need in the highest quantities to sustain life."
That sounds heavy, but it's pretty simple considering the food you eat contains either one, two, or all three of the main macro groups. Let's pretend you eat a flawlessly healthy diet. That apple you have as a daily snack has 1g of protein, 30g of carbohydrates, and 0g of fat -- it's a good source of carbs, but not anything else. The 6oz skinless chicken breast you enjoy every night for dinner, on the other hand, has 6g of fat, 52g of protein, and 0g of carbohydrates, so it's a huge source of protein, but not so much fat or carbs.