How much protein per meal?
For building or keeping muscle, aim for about 0.4 g of protein per kg of body weight per meal, across at least four meals, which reaches the 1.6 g/kg daily level where muscle gains plateau. That is about 28 g per meal for a 70 kg adult. Larger servings are not wasted: a 2023 study found 100 g of protein in one meal produced a bigger and longer muscle-building response than 25 g, so total daily protein matters more than hitting an exact per-meal number.
Run your own numbers: Daily protein intake calculatorThe per-meal target by body weight
| Body weight | 0.4 g/kg per meal (standard) | 0.55 g/kg per meal (upper) | Daily total at 4 meals |
|---|---|---|---|
| 50 kg | 20 g | 28 g | 80 to 110 g |
| 60 kg | 24 g | 33 g | 96 to 132 g |
| 70 kg | 28 g | 39 g | 112 to 154 g |
| 80 kg | 32 g | 44 g | 128 to 176 g |
| 90 kg | 36 g | 50 g | 144 to 198 g |
| 100 kg | 40 g | 55 g | 160 to 220 g |
These figures come from Schoenfeld and Aragon (2018), who worked backwards from the daily intake where muscle gains plateau (about 1.6 g/kg, up to 2.2 g/kg) and divided it over at least four meals. They apply to people who train. If you do not, the general-health targets in the protein calculator are lower.
Where the "30 g ceiling" came from
Early studies gave young men fast-digesting whey on its own after a workout and measured muscle protein synthesis for a few hours. Synthesis rose up to about 20 to 25 g and then flattened, while extra amino acids were burned for energy. That became the gym rule that "you can only absorb 30 g at once".
Three things were wrong with the leap from that study design to everyday eating:
- Absorption is not the limit. The gut absorbs nearly all protein eaten. The question was only what the muscle does with it.
- Real meals digest slowly. Protein eaten with fat, fibre and carbohydrate trickles into the blood over hours, so the muscle can use more of it.
- The measurement windows were short. A study that stops at 4 to 6 hours cannot see a response that runs longer.
What the 100 g study found
In 2023 Trommelen and colleagues at Maastricht gave trained participants either 25 g or 100 g of protein after exercise and tracked the result for more than 12 hours with isotope tracers. The 100 g serving produced a larger response that lasted longer, with more of the dietary protein built into muscle. Breakdown and oxidation of amino acids changed very little.
Two cautions. This was one study, in younger trained adults, using a milk protein. And spreading protein still has a small edge: Areta et al. (2013) found four servings of 20 g over 12 hours beat both eight servings of 10 g and two of 40 g for muscle protein synthesis.
Older adults need more per meal
Muscle becomes less responsive to protein with age, a change called anabolic resistance. Moore et al. (2015) estimated that older men needed about 0.40 g/kg per meal to reach the response younger men got from about 0.24 g/kg. For adults over 65 that means 25 to 40 g of protein in each main meal, which is more than a typical breakfast provides.
What 30 g of protein looks like
| Food | Approximate protein |
|---|---|
| 100 g cooked chicken breast | about 31 g |
| 150 g cooked fish fillet | about 30 g |
| 4 large eggs | about 25 g |
| 250 g plain Greek yoghurt | about 25 g |
| 200 g firm tofu | about 25 to 30 g |
| 1 scoop whey protein (30 g powder) | about 20 to 25 g |
Collagen powder adds grams but is an incomplete protein, low in leucine, so count it as a supplement to these foods rather than a replacement.
A simple way to apply this
- Work out your daily target in the protein calculator.
- Divide it by the number of meals you actually eat, three to five.
- Fix breakfast first. It is the meal most people under-eat protein in.
- Do not stress about one large meal. The daily total and consistency matter most.
Frequently asked questions
Can your body only absorb 30 grams of protein at a time?
How much protein per meal to build muscle?
Do older adults need more protein per meal?
Is it better to eat protein in four meals or two?
Does protein timing around workouts matter?
Sources
- Schoenfeld BJ, Aragon AA. How much protein can the body use in a single meal for muscle-building? Implications for daily protein distribution. J Int Soc Sports Nutr. 2018;15:10 (0.4 g/kg per meal over at least four meals; up to 0.55 g/kg)
- Trommelen J, et al. The anabolic response to protein ingestion during recovery from exercise has no upper limit in magnitude and duration in vivo in humans. Cell Rep Med. 2023;4(12):101324 (100 g vs 25 g; larger and longer response, over 12 hours)
- Moore DR, et al. Protein ingestion to stimulate myofibrillar protein synthesis requires greater relative protein intakes in healthy older versus younger men. J Gerontol A Biol Sci Med Sci. 2015;70(1):57-62 (about 0.40 g/kg older vs 0.24 g/kg younger)
- Areta JL, et al. Timing and distribution of protein ingestion during prolonged recovery from resistance exercise alters myofibrillar protein synthesis. J Physiol. 2013;591(9):2319-31 (4 x 20 g beat 8 x 10 g and 2 x 40 g over 12 hours)
- Jäger R, et al. ISSN position stand: protein and exercise. J Int Soc Sports Nutr. 2017;14:20
Educational information only, not medical advice. Results are population estimates from published studies and may not apply to you.