1. Biochemistry of Dietary Protein
Protein is an essential macronutrient that provides the nitrogen and amino acids needed to build, repair, and maintain tissues throughout the body, including skeletal muscle, skin, organs, and hair. There are 20 amino acids, nine of which are **essential amino acids (EAAs)** that the body cannot synthesize on its own and must obtain from diet.
Consuming adequate protein is critical for recovery from exercise and maintaining muscle tissue. When dietary protein is ingested, it is broken down into free amino acids, which enter the bloodstream and support muscle protein synthesis.
2. Recommended Daily Targets for Athletes
While the Recommended Dietary Allowance (RDA) is a baseline of **0.8 grams per kilogram of body weight** to prevent deficiency in sedentary adults, active individuals require higher intakes to support recovery.
International sports nutrition organizations (including the Sports Dietitians Association) suggest active individuals target **1.2 to 2.0 grams per kilogram of body weight** (approx. 0.54 to 0.9 grams per pound) daily. For strength athletes looking to maximize muscle hypertrophy, targets range from **1.8 to 2.2 grams per kilogram**.
3. Muscle Preservation During Caloric Deficits
During a calorie deficit, the body is forced to burn stored energy. Without sufficient protein, it may break down muscle tissue to meet its amino acid needs. Increasing protein intake to **2.0 to 2.4 grams per kilogram** during a deficit helps protect lean muscle mass, ensuring that weight loss comes primarily from fat storage. You can check your deficits using our Weight Loss Calculator.
4. Lean Mass vs. Total Weight Calculations
For individuals with higher body fat percentages, calculating protein requirements based on total body weight can sometimes yield unnecessarily high targets. Basing requirements on **Lean Body Mass (LBM)** instead provides a more precise target. A standard guideline is **2.3 to 2.8 grams of protein per kilogram of Lean Mass**. You can estimate your body fat percentage using our Body Fat Calculator.