The short version
- The RDA is 0.8 g per kg of body weight. People who train usually do better at 1.4–2.0 g/kg (ISSN).
- Spread it out: roughly 0.4 g/kg per meal across 3–4 meals.
- Build every meal around a protein first, then add the rest.
Protein is the nutrient I get asked about most, and it’s the one that matters most for a rebuild. Muscle, tendon and nearly every other tissue in your body is built and repaired from it. Here’s what the research says, in plain English.
How much per day
- General health: the Recommended Dietary Allowance is 0.8 grams per kilogram of body weight per day. That covers needs for most healthy, mostly inactive adults.
- Active people and people who lift: the International Society of Sports Nutrition’s position stand supports 1.4–2.0 g/kg/day for most exercising people.
- While cutting body fat or building muscle: the upper end of that range (and sometimes higher) can help preserve or build muscle.
For a 180 lb (82 kg) person, that’s about 65 g/day at the RDA and about 115–165 g/day for an active lifter. Our protein calculator does the math for you.
How to spread it out
A 2018 review by Schoenfeld and Aragon suggests aiming for about 0.4 g/kg per meal across at least four meals to maximize muscle building. In practice, three to four protein-anchored meals a day, each with roughly 25–45 g, works for most people. Front-load it: breakfast is where most people come up short.
What 25–30 grams looks like
Approximate values; check labels and USDA FoodData Central for exact numbers.
- 4 oz cooked chicken breast: about 35 g
- 1 cup (about 8 oz) plain nonfat Greek yogurt: about 23 g
- 4 large eggs: about 25 g
- 1 can (5 oz) tuna, drained: about 25–30 g
- 1½ cups cooked lentils: about 27 g
- 1 cup cottage cheese: about 25 g
- 1 scoop whey protein: about 20–25 g
Build a protein-first plate
- Pick the protein for the meal first.
- Size it: roughly 1–2 palm-sized portions.
- Add vegetables, then a carb sized to your day, then a little fat.
- Add a protein snack if you’re short at the end of the day: Greek yogurt, milk, jerky, cottage cheese or a shake.
Do you need protein powder?
No. It’s a convenience food, not a requirement. It can help if you’re busy, traveling or struggling to hit your number with whole foods. If you use supplements, choose products tested by a third party, and know that supplements aren’t reviewed by the FDA for safety or effectiveness before sale.
Common mistakes
- A small breakfast and lunch with almost no protein, and a huge dinner.
- Counting the total weight of a food as grams of protein (4 oz of chicken isn’t 113 g of protein).
- Forgetting plant proteins: beans, lentils, tofu, tempeh and edamame all count.
- Going high-protein with kidney disease without a clinician’s guidance.
Do this today (2 minutes)
Run the protein calculator, then look at tomorrow’s breakfast. If it has under 25 g of protein, add eggs, Greek yogurt or cottage cheese.
Questions people ask
How much protein do I need to build muscle?
The ISSN position stand supports about 1.4–2.0 g per kg of body weight per day for most people who train, spread across meals. Total daily intake matters most; timing is a smaller detail.
Can you eat too much protein?
Healthy adults generally tolerate high-protein diets well. People with kidney disease or on protein-restricted diets should follow their clinician’s guidance. Extra protein also means extra calories.
What are good plant protein sources?
Lentils, beans, chickpeas, tofu, tempeh, edamame, seitan, and soy milk, plus smaller amounts from whole grains, nuts and seeds. Combining sources across the day covers your amino acids.
Sources
- Jäger R et al. International Society of Sports Nutrition position stand: protein and exercise. JISSN, 2017.
- Schoenfeld BJ, Aragon AA. How much protein can the body use in a single meal? JISSN, 2018.
- USDA FoodData Central (nutrient values for foods).
- U.S. Departments of Agriculture and Health and Human Services. Dietary Guidelines for Americans.
Education only. Not medical advice. Confirm with your clinician.