Short answer: there is no limit of 20–30 g. The body absorbs almost all of it. The question is how much goes to muscle.
The 30 g myth
It is often said that the body can only use 20–30 g of protein per meal, and that the rest is lost. It comes from studies where people drank fast whey protein on its own, without other food. There, muscle protein synthesis levelled off at around 20–25 g1.
Absorption: almost all of it
The protein in food is almost fully absorbed in the gut. Measurements in humans show that 91–99% of the amino acids in milk protein and 89–97% in soya protein2 are absorbed in the small intestine. What does not go to muscle is used elsewhere in the body or as energy.
What the research says now
A 2018 review1 found that more than 20 g leads to more amino acid oxidation, but that not all of the excess is lost. Some is used to build tissue. Protein in regular food, together with fat and carbohydrate, is also absorbed more slowly than whey on its own.
In 2023, researchers tested 100 g against 25 g of protein after exercise3. 100 g gave a greater response in the muscles, and it lasted for more than 12 hours.
In practice
The 2018 review recommends 0.4–0.55 g per kilo per meal, spread over at least four meals1. A large meal is not wasted, but spreading it out can pay off.
| Body weight | Per meal (0.4–0.55 g/kg) | Four meals |
|---|---|---|
| 60 kg | 24–33 g | 96–132 g |
| 70 kg | 28–39 g | 112–154 g |
| 80 kg | 32–44 g | 128–176 g |
| 90 kg | 36–50 g | 144–198 g |
| 100 kg | 40–55 g | 160–220 g |
Tool: spread protein over the day
- Work out your daily need in the protein calculator, and divide by four.
- Aim for 0.4–0.55 g per kilo in each of the four meals.
- A meal with more, like 80 g, is not wasted. You then need less for the rest of the day.
Questions
Can the body only absorb 30 g of protein per meal?
No. The body absorbs almost all of it: 89–99% of the amino acids in milk and soya protein. 30 g is roughly where the muscle response levels off with fast whey protein on its own, not a limit for absorption.
Is 80 g of protein in one meal wasted?
No. In a 2023 study, 100 g gave a greater and longer response in the muscles than 25 g.
How often should I eat protein?
The 2018 review suggests at least four meals with 0.4–0.55 g per kilo.
References
Every link in the text points to its source. The number after it refers to this list.
- Schoenfeld BJ, Aragon AA. How much protein can the body use in a single meal for muscle-building? Implications for daily protein distribution. Journal of the International Society of Sports Nutrition, 2018. accessed 2026-10-01
- Bandyopadhyay S, Kashyap S, Calvez J mfl. Evaluation of Protein Quality in Humans and Insights on Stable Isotope Approaches to Measure Digestibility – A Review. Advances in Nutrition, 2022. accessed 2026-10-01
- Trommelen J, van Lieshout GAA, Nyakayiru J mfl. The anabolic response to protein ingestion during recovery from exercise has no upper limit in magnitude and duration in vivo in humans. Cell Reports Medicine, 2023. accessed 2026-10-01
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