How Much Protein Per Day? The Honest Ranges

Protein advice comes in two volumes: the official number everyone quotes, and the number active people actually use. They differ by more than double.

Short answer: the RDA is 0.8 g of protein per kilogram of body weight per day — but that’s a minimum to avoid deficiency, not an optimum. For people who train, sports-nutrition consensus (including the ISSN position stand) lands at 1.4–2.0 g/kg; for older adults, common guidance starts at 1.0–1.2 g/kg to counter age-related muscle loss. For a 70 kg person, that’s the difference between 56 g and 98–140 g a day.

The ranges, translated

Situation	g per kg/day	For 70 kg	For 90 kg
RDA (minimum)	0.8	56 g	72 g
Generally active	1.2–1.6	84–112 g	108–144 g
Building muscle	1.6–2.0	112–140 g	144–180 g
Cutting (preserving muscle)	1.8–2.2	126–154 g	162–198 g

Ranges compiled from the US RDA and published sports-nutrition positions (ACSM/AND/DC 2016 give 1.2–2.0 g/kg for athletes; the ISSN position stand gives 1.4–2.0). WHO and EFSA set the reference intake slightly differently, at 0.83 g/kg. For adults over 65, PROT-AGE and ESPEN recommend 1.0–1.2 g/kg, rising to 1.2–1.5 with illness. Individual needs vary, and medical conditions belong with a clinician.

Distribution beats heroics

Short-term studies measuring muscle protein synthesis show a clear dose response per meal, with the curve flattening somewhere around 20–40 g of quality protein. That’s where the familiar “spread it across three meals” advice comes from, and as a practical habit it’s reasonable: three decent meals are easier to hit than one heroic dinner.

The honest caveat is that this evidence is mostly acute. Trials that actually manipulated protein distribution over 8 to 16 weeks of training have largely failed to show an advantage for even spreading, once total daily intake was matched. Recent reviews land in the same place. The widely quoted “0.4 g/kg per meal” figure is also less independent than it sounds: it’s essentially a daily target divided by four.

So treat distribution as a convenience that makes the daily number achievable, not as a lever with its own proven payoff. Total intake is the part with the strong evidence behind it.

Where the grams hide

The daily target sounds hard until you see meals, not foods: two eggs are 12.5 g, but eggs plus serek wiejski is 29 g; a palm of chicken is ~30 g; a tin of tuna ~25 g; 150 g of lentils ~12 g. The gap between 56 and 120 g closes in three ordinary decisions, not one shake.

3sense Food tracks this the way the research frames it: protein per meal and per day, with provenance — not just “21 g at lunch” but 14 g of it from the salmon — so a weekly view shows whether the plan actually holds on training days. If your goal is muscle specifically, the muscle-gain guide covers how targets, logging and recovery fit together.