What is the official RDA for protein?

The Dietary Reference Intakes published by the U.S. National Academies set the Recommended Dietary Allowance for healthy adults at 0.8 grams of protein per kilogram of body weight per day. The same report defines an Acceptable Macronutrient Distribution Range of 10–35% of daily calories from protein. These are population reference values, not individual advice.

Why do sports nutrition organizations publish higher protein numbers than the RDA?

The RDA is defined as the intake sufficient to meet the requirement of nearly all healthy people — a level built on preventing deficiency. Position stands from bodies like the American College of Sports Medicine (1.2–2.0 g/kg/day for athletes) and the International Society of Sports Nutrition (1.4–2.0 g/kg/day for building and maintaining muscle) are answering a different question: intakes associated with training adaptations, not minimums to avoid deficiency.

So how much protein should I eat?

No article can answer that, and this one deliberately doesn't try. The published values are population references written for healthy adults; pregnancy, childhood, older age, kidney or liver conditions, diabetes, and a history of disordered eating all change the picture. A physician, dietitian, or other qualified health provider is the right source for a personal number.

The science, sourced

How much protein do people need? What the official numbers say

By WristSkill Labs, LLC · September 4, 2026 · Every figure below is cited to a government reference document or a peer-reviewed source.

Read this first. This article reports what published reference documents say — nothing more. It is general information, not medical or nutrition advice, and no number below is a recommendation about what you should eat. The documents themselves are population references written for healthy people; your number is a conversation for a physician, dietitian, or other qualified health provider.

"How much protein do I need?" is probably the most-searched question in nutrition, and most answers on the internet are someone's opinion wearing a lab coat. The honest answer is that several official and peer-reviewed reference numbers exist, they were written for different purposes, and they don't fully agree. So instead of picking one and selling it, here is the whole shelf — who published each number, what it actually means, and why they differ.

The government baseline

The U.S. reference document is the Dietary Reference Intakes (DRI) report from the Institute of Medicine (now the National Academies). It sets the Recommended Dietary Allowance (RDA) for protein in healthy adults at 0.8 grams per kilogram of body weight per day. By the report's own definition, the RDA is the average daily intake sufficient to meet the nutrient requirement of nearly all (97–98%) healthy individuals — it was derived from nitrogen-balance studies, which measure the point where the body stops losing more protein than it takes in [1].

The same report also publishes a much wider band: the Acceptable Macronutrient Distribution Range (AMDR), which puts protein at 10–35% of daily calories. That's the range the report associates with adequate nutrition and reduced chronic-disease risk — and it's telling that the ceiling of the official range sits far above what the RDA alone would work out to [1].

One more government number shows up in daily life: the FDA's Daily Value used on U.S. food labels, which is 50 grams of protein per day for adults and children age 4 and up, based on a 2,000-calorie reference diet. It's a labeling convention, not an individualized target — and the FDA doesn't even require the percent Daily Value for protein to appear on most labels unless the product makes a protein claim [2].

What "grams per kilogram" works out to

Because the RDA is expressed per kilogram of body weight, the document's own definition implies some arithmetic. Purely as an illustration of what the units mean — not as a target for anyone — the RDA's 0.8 g/kg applied to a 68 kg (150 lb) reference adult works out to about 54 grams per day, which is in the neighborhood of the FDA's 50-gram labeling value [1, 2]. That is the deficiency-prevention baseline the documents describe for healthy adults; it is not a verdict on what any particular person should do.

What sports and aging researchers publish

Peer-reviewed position stands — consensus documents from professional bodies — publish higher ranges for specific populations, because they're answering a different question than the RDA:

Athletes: the joint position of the Academy of Nutrition and Dietetics, Dietitians of Canada, and the American College of Sports Medicine states that data support protein intakes of 1.2–2.0 g/kg/day for athletes, spread across the day [3].
Building and maintaining muscle: the International Society of Sports Nutrition's position stand states that 1.4–2.0 g/kg/day is sufficient for most exercising individuals to build and maintain muscle mass [4].
Where gains plateau: a 2018 meta-analysis of 49 resistance-training trials found that protein's effect on fat-free-mass gains plateaued around 1.6 g/kg/day, with the upper bound of the confidence interval reaching about 2.2 g/kg/day [5].
Healthy older adults: the PROT-AGE international study group recommends 1.0–1.2 g/kg/day for people over 65 — explicitly noting that older adults with severe kidney disease are an exception whose intake is a medical matter [6].

Why the numbers disagree

The spread from 0.8 to 2.0 isn't sloppiness — the documents are measuring different things. The RDA answers "how little is enough to prevent deficiency in nearly everyone healthy." The position stands answer "what intakes are associated with training adaptations or preserving muscle with age." A 2024 peer-reviewed critique in the Journal of the International Society of Sports Nutrition makes the argument explicitly: the RDA is best read as a floor, not an optimum, and the paper reports no evidence of harm from substantially higher intakes in healthy people — while acknowledging that people with existing kidney disease are a medically distinct case [7]. That "in healthy people" qualifier is the entire ballgame, which brings us to:

Who these numbers were never written for

Pregnancy and lactation. The DRI report assigns different, higher reference values here — and applying them is exactly the kind of thing prenatal providers exist for [1].
Children and teens. The DRIs are age-banded; the adult numbers above don't apply [1].
Kidney or liver disease, diabetes, and other medical conditions. Every document above scopes itself to healthy people, and several call out renal disease as the explicit exception [6, 7]. Protein intake in these situations is clinical territory, full stop.
A history of disordered eating. Numeric intake targets can be actively harmful here; this is provider territory too.

The usual reminder: this article is general information about published reference documents, not medical or nutrition advice, and it makes no recommendation about how much protein you should eat — you'll notice it never once told you your number, because no article can. Talk to a physician, dietitian, or other qualified health provider before changing your diet — especially if you have a medical condition or a history of disordered eating.

Jack Steel doesn't pick your number either. You bring a goal — from your own provider or your own judgment — and the app just makes hitting it satisfying to log.

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References

[1] Institute of Medicine. Dietary Reference Intakes for Energy, Carbohydrate, Fiber, Fat, Fatty Acids, Cholesterol, Protein, and Amino Acids. Washington, DC: The National Academies Press; 2005. doi:10.17226/10490
[2] U.S. Food & Drug Administration. Daily Value on the Nutrition and Supplement Facts Labels. fda.gov
[3] Thomas DT, Erdman KA, Burke LM. Position of the Academy of Nutrition and Dietetics, Dietitians of Canada, and the American College of Sports Medicine: Nutrition and Athletic Performance. J Acad Nutr Diet. 2016;116(3):501–528. doi:10.1016/j.jand.2015.12.006
[4] Jäger R, et al. International Society of Sports Nutrition position stand: protein and exercise. J Int Soc Sports Nutr. 2017;14:20. doi:10.1186/s12970-017-0177-8
[5] Morton RW, et al. A systematic review, meta-analysis and meta-regression of the effect of protein supplementation on resistance training-induced gains in muscle mass and strength in healthy adults. Br J Sports Med. 2018;52(6):376–384. doi:10.1136/bjsports-2017-097608
[6] Bauer J, et al. Evidence-based recommendations for optimal dietary protein intake in older people: a position paper from the PROT-AGE Study Group. J Am Med Dir Assoc. 2013;14(8):542–559. doi:10.1016/j.jamda.2013.05.021
[7] Antonio J, et al. Common questions and misconceptions about protein supplementation: what does the scientific evidence really show? J Int Soc Sports Nutr. 2024;21(1):2341903. doi:10.1080/15502783.2024.2341903