“Your body can absorb only 30 grams of protein per meal.”
Your body does not stop absorbing protein at 30 grams in a meal; larger amounts are absorbed and used.
You do not need to split protein into 30-gram portions or worry that a bigger protein meal goes to waste. Spread your protein across the day in whatever way suits your meals.
Plan meals around your daily protein total, and do not cut a high-protein meal short because of a 30-gram rule.
Safety note: People with chronic kidney disease need a protein target set with their care team. Kidney nutrition guidelines give specific protein advice that depends on the stage of disease and whether a person is on dialysis.
Talk to a healthcare professional if: you have chronic kidney disease or have been told to limit protein.
A carefully controlled study that tracked labeled protein for 12 hours found the body absorbed and used 100 grams from one meal, putting more into muscle than from 25 grams and burning almost none of the extra for energy. The 30-gram idea came from short studies of muscle-building rates, not absorption, and it does not hold up when people are measured for longer. Confidence is moderate because the key study is a single trial in 36 healthy young men.
Your body does not stop absorbing protein at 30 grams in a meal; larger amounts are absorbed and used. In a study of 36 healthy young men after a full-body workout, eating 100 grams of protein gave a bigger muscle-building response, lasting more than 12 hours, than 25 grams, with very little of the extra protein burned for energy.
Older studies found that about 20 to 25 grams of protein maxed out muscle building in the few hours after exercise, which is where the per-meal limit idea came from. Those studies measured a short window, while the newer study followed people for 12 hours and found the larger meal kept working longer. It tested healthy young men only, and the authors say the results may not apply to other groups.
- Trommelen J, van Lieshout GAA, Nyakayiru J, Holwerda AM, Smeets JSJ, Hendriks FK, van Kranenburg JMX, Zorenc AH, Senden JM, Goessens JPB, Gijsen AP, van Loon LJC. 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;4(12):101324. DOI: 10.1016/j.xcrm.2023.101324. PMID: 38118410. PMCID: PMC10772463
- Ikizler TA, Burrowes JD, Byham-Gray LD, et al. KDOQI Clinical Practice Guideline for Nutrition in CKD: 2020 Update. American Journal of Kidney Diseases. 2020;76(3 Suppl 1):S1-S107. DOI: 10.1053/j.ajkd.2020.05.006. PMID: 32829751