Key Takeaway: Calories dictate total weight loss; macronutrient ratios determine whether weight lost is body fat or skeletal muscle. Use our Macro Split Calculator.
The Three Essential Macronutrients
- Protein (4 kcal/g): Provides essential amino acids for muscle synthesis, immune function, and enzyme production.
- Fats (9 kcal/g): Essential for steroid hormone synthesis (testosterone, estrogen) and cell membrane integrity.
- Carbohydrates (4 kcal/g): The preferred fuel substrate for high-intensity muscular work and central nervous system cognition.
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Scientific References & Clinical Studies
- Dietary protein requirements and adaptive advantages in athletes — Br J Nutr. Phillips SM.
Related Nutrition Guides & Tools
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