Macros (Macronutrients)
The three main nutrients that provide calories: protein, carbohydrates, and fat.
Protein provides 4 calories per gram and is essential for muscle repair and growth. Carbohydrates provide 4 calories per gram and are the body's preferred fuel source. Fat provides 9 calories per gram and is essential for hormones, brain function, and nutrient absorption. A typical macro split for active adults is 30% protein, 40% carbs, 30% fat, though optimal ratios vary by goal. Tracking macros is more effective than tracking only calories because body composition depends on what you eat, not just how much.
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