How Much Protein Do You Actually Need?

Protein is the macronutrient most people under-consume — and the one with the biggest impact on body composition. Whether your goal is building muscle, preserving lean mass during a cut, or simply supporting healthy aging, getting the right amount of protein matters.

The Official RDA vs. Optimal Intake

The Recommended Dietary Allowance (RDA) for protein is 0.8 g per kilogram of body weight per day. However, this number represents the minimum to prevent deficiency in sedentary adults — not the optimal amount for health or performance.

Current sports nutrition research suggests significantly higher intakes for most active people:

• General active adults: 1.2–1.6 g/kg (0.55–0.73 g/lb)
• Strength training / muscle gain: 1.6–2.2 g/kg (0.73–1.0 g/lb)
• Fat loss (caloric deficit): 1.6–2.4 g/kg (0.73–1.1 g/lb) — higher intake helps preserve muscle
• Older adults (50+): 1.2–1.5 g/kg to counteract age-related muscle loss

Does Protein Timing Matter?

Research shows that total daily protein intake matters far more than timing. That said, evenly distributing protein across 3–4 meals (25–40 g per meal) maximizes muscle protein synthesis compared to eating most of your protein in a single meal.

Best Protein Sources

High-quality protein sources contain all essential amino acids and are well-absorbed:

• Animal sources: Chicken, turkey, fish, eggs, Greek yogurt, whey protein
• Plant sources: Soy, lentils, chickpeas, quinoa, hemp seeds, pea protein

Plant-based eaters can easily meet protein needs by combining complementary sources throughout the day.

Can You Eat Too Much Protein?

For healthy adults with normal kidney function, high-protein diets (up to 2.2 g/kg) have been studied extensively and show no adverse effects on kidney health, bone density, or liver function. However, protein above your body's utilization capacity simply gets converted to energy — so there are diminishing returns beyond a certain point.

Calculate Your Protein Needs

Use our free Protein Intake Calculator for a personalized daily target based on your weight, activity level, and goals. Then use the Macro Calculator to fit your protein target into a complete nutrition plan, or check your Lean Body Mass for a more precise calculation based on fat-free mass.