Macronutrient requirements change with physical activity levels due to varying energy demands. For sedentary individuals, a balanced diet may consist of roughly 45-65% carbohydrates, 10-35% protein, and 20-35% fat. However, athletes or those engaging in intense exercise often increase their carbohydrate intake to support energy needs and muscle recovery. Additionally, higher protein consumption may be necessary for muscle repair and growth, while fat intake should still remain balanced to ensure adequate energy levels. Adjusting macronutrient ratios according to activity helps optimize performance and overall health.