How Much Protein Do You Actually Need? Science-Based Guide

The protein question generates more misinformation than almost any other nutrition topic. Social media influencers will tell you to eat 2g per pound. The government says 0.36g per pound is enough. The truth is somewhere in between — and depends on your activity level.

The Official Recommendation (And Why It's Low)

The RDA for protein is 0.36g per pound (0.8g per kg) of body weight. For a 180-pound person, that's about 65g per day.

This number was set to prevent deficiency, not to optimize muscle building or recovery. It's the minimum to avoid getting sick, not the optimal amount for health and performance.

What the Science Actually Says

Activity Level	Protein per lb (g)	Example: 180 lb person
Sedentary	0.4-0.5	72-90g
Moderate exercise (3x/week)	0.5-0.65	90-117g
Resistance training	0.6-1.0	108-180g
Bodybuilding / Cutting	0.8-1.2	144-216g
Endurance athletes	0.55-0.75	99-135g

The sweet spot for most resistance trainers is 0.7-0.9g per pound of body weight. This is backed by the largest meta-analyses on protein intake and muscle protein synthesis (Morton et al., 2018; Schoenfeld et al., 2013). Going above 1.0g per pound provides diminishing returns.

The Protein Ceiling: How Much Can You Absorb?

The "30g per meal" rule comes from older studies showing muscle protein synthesis plateaus around 20-25g of protein per serving. More recent research suggests this ceiling is higher (~40g) for larger meals and whole food sources.

Practical takeaway: Aim for 3-4 protein feedings of 25-40g each across the day. Your body absorbs all of it — the "30g limit" myth has been debunked. Total daily intake matters more than per-meal timing.

Best Protein Sources

Animal Sources (Complete proteins):

Chicken breast: 31g protein per 100g
Lean ground beef (90/10): 26g per 100g
Greek yogurt (2%): 17g per cup
Eggs: 6g per large egg
Whey protein: 24g per scoop

Plant Sources:

Lentils: 18g per cup (cooked)
Tofu: 20g per cup
Tempeh: 31g per cup
Pea protein: 24g per scoop

Plant-based protein tips: Most plant proteins contain all essential amino acids but in lower proportions of one or two (often lysine or methionine). You do not need to combine proteins at the same meal — the old "complementary protein" rule from the 1970s was retracted by its author and is rejected by the Academy of Nutrition and Dietetics. Just eat a variety of plant proteins (beans, lentils, soy, grains, nuts) across the day; your body pools amino acids over 24 hours.

Calculate Your Protein Needs →

Bottom Line

Most people don't need 2g per pound. Most resistance trainers need 0.7-0.9g per pound. Use our protein calculator to get your personalized number, then spread it across 3-4 meals per day.