Stop guessing. Calculate the exact daily protein target you need to achieve your specific physical goals, backed by sports science.
Protein is the only macronutrient responsible for repairing and building skeletal muscle tissue. While carbohydrates provide the energy to lift heavy weights, protein provides the actual structural building blocks (amino acids) your body uses to recover.
If you systematically tear down your muscle fibers with intense resistance training but fail to provide adequate protein, you will not grow. Period. You will simply accumulate fatigue and risk injury.
The Golden Rule: Total calories dictate your weight on the scale. Total protein dictates your body composition. Hit your protein target every single day, even on rest days.
It sounds counterintuitive, but you actually need more protein when losing weight than when bulking. When you are in a calorie deficit, your body is starved for energy. If your protein intake drops, your body will break down your hard-earned muscle tissue to convert it into glucose. High protein intake (1.8 - 2.4g per kg) prevents muscle loss and keeps you highly satiated (full) during a diet.
When you are eating in a calorie surplus, your body is in an anabolic (building) state. Because you have excess energy from carbs and fats, your body is very efficient at sparing protein. The optimal range for maximum muscle protein synthesis sits between 1.6 to 2.2 grams per kilogram of body weight. Eating more than this will not yield faster muscle growth; it will simply be oxidized for energy.
For endurance athletes, martial artists, or individuals looking to simply maintain their current physique, a moderate intake of 1.4 to 2.0 grams per kilogram is sufficient to offset the protein breakdown caused by prolonged physical activity.
If you do not exercise, your protein needs are minimal. The RDA (Recommended Dietary Allowance) is set at 0.8 grams per kilogram. This is the absolute bare minimum required to prevent malnutrition and muscle wasting in sedentary adults.