How Much Protein Do I Actually Need?
The official 0.8 grams per kilo is a floor for staying healthy, not a figure for building muscle. For people who lift, the research points to about 1.6 grams per kilo, and here is how to check where your own log sits.
The short answer to "how much protein do I actually need" is less than the internet suggests if the question is about staying healthy, and more than the official figure if you lift. The official daily recommendation is 0.8 grams for every kilo you weigh, and it was set as a floor that keeps almost everybody from falling short. For people doing regular strength training, the largest pooled study so far found that extra protein stopped adding muscle at around 1.6 grams per kilo a day on average, with some people still benefiting up to about 2.2. Everything else is detail about where inside that range you sit.
Where the 0.8 grams figure comes from
The number most governments print was worked out in studies that measured how much nitrogen people took in and how much they lost. Protein is the only big part of food that carries nitrogen, so when the two sides balance, the body is neither building up its protein stores nor running them down. Researchers found the intake where most adults broke even, then added a margin so the figure would cover nearly everyone. The United States and Canada settled on 0.8 grams per kilo. The UK's figure is 0.75.
Read that again and notice what it is for. It answers "how little can a typical adult eat without losing body protein". It was never meant to answer "how much helps somebody who is asking their muscles to grow three times a week", and the people in those early studies were mostly not doing strength training.
So the figure is not wrong. It is answering a different question from the one you probably typed.
What changes when you lift
Strength training damages and then rebuilds muscle, and the rebuilding runs on protein. In the day or two after a session, the body is making new muscle tissue faster than usual, and that process leans on what you have eaten. The open question has always been how much protein it takes before more stops helping.
The best answer available comes from a 2018 analysis that pooled 49 trials and 1,863 people, all doing structured strength training, some eating more protein than others (Morton and colleagues, 2018). Muscle gained from the training rose with protein intake until about 1.6 grams per kilo per day, then flattened. The statistical spread around that point ran from roughly 1.0 to 2.2, which is why you will see 2.2 quoted as the top of the useful range.
The size of the effect matters as much as the breakpoint, and it is the part that rarely gets quoted. Across those trials, the people eating more protein added about 0.3 kilos more lean mass than the people eating less, and their best single lift went up by about 2.5 kilos more. Real differences, but modest ones, layered on top of whatever the training itself produced. The effect was also smaller in older participants and larger in people who had been training for a while.
The practical reading: protein raises the ceiling on what training can build. It does not build anything on its own, and going from adequate to generous buys less than going from short to adequate.
How to work out your own range
The arithmetic is just your weight multiplied by each end of the range. Take somebody who weighs 80 kilos, about 176 pounds:
| Grams per kilo | What the number means | Daily protein at 80 kilos |
|---|---|---|
| 0.8 | Official floor for adults in general | 64 grams |
| 1.6 | Where extra protein stopped adding muscle, on average | 128 grams |
| 2.2 | Top of the range some people still benefited at | 176 grams |
If you think in pounds, the same three lines are roughly 0.36, 0.73 and 1.0 grams per pound of bodyweight. That last one is where the old gym rule of "a gram per pound" comes from. It sits at the generous end of the evidence rather than the middle of it.
One adjustment changes the answer a lot for some people. Fat tissue needs very little protein to maintain, so for somebody carrying a lot of body fat, multiplying total weight overstates the need. Take a person who weighs 100 kilos at 35% body fat: their lean mass, everything that is not fat, is 65 kilos. At 1.6 grams per kilo, total bodyweight gives 160 grams a day and lean mass gives 104. That is a gap of 56 grams, a little more than one large chicken breast. Some researchers suggest working from lean mass, or from the weight you are heading towards, for exactly this reason.
Does it matter how you spread it across the day?
Somewhat, though less than the daily total does. The muscle-building response to a single meal seems to top out at a moderate dose, which is where the old claim that "your body can only use 30 grams at a time" came from. That claim is a misreading. Protein beyond that point is still digested and still used; it just does less for muscle in that particular sitting.
A 2018 review worked through what this means in practice and landed on about 0.4 grams per kilo per meal, across at least four meals, as a sensible way to reach 1.6 a day (Schoenfeld and Aragon, 2018). At 80 kilos, that is about 32 grams a sitting.
What this mostly catches is a lopsided day. A common pattern looks like 10 grams at breakfast, 20 at lunch and 70 at dinner. The total reaches 100 grams, but two of the three meals do very little for muscle and the third does no more than a 40-gram dinner would have. Moving some of that dinner protein to the morning changes the shape of the day without changing the total.
What 30 grams looks like on a plate
Rough figures for common foods, so the numbers above become something you can picture:
- 100 grams of cooked chicken breast: about 31 grams
- A 170-gram pot of plain Greek yogurt: about 17 grams
- Two large eggs: about 12 to 13 grams
- Half a block of firm tofu, around 200 grams: about 30 grams, depending on the brand
- A cup of cooked lentils: about 18 grams
Plants count. Lentils and tofu carry less of one or two of the building blocks muscle uses than meat or dairy do, but across a normal day of mixed food that difference mostly evens out. The total is the number to watch first.
Eating below maintenance changes the picture
When somebody eats below their maintenance calories for weeks at a time, the body is short of energy and more willing to break down muscle to cover it. That is the situation where higher protein earns its keep. The International Society of Sports Nutrition's position stand on protein puts 1.4 to 2.0 grams per kilo as enough for most people who exercise, and notes that lean, trained people eating below maintenance may hold on to more muscle towards the top of that range or above it (Jäger and colleagues, 2017).
The flip side is that eating above maintenance probably makes protein a little less critical. Spare energy is thought to reduce the pressure to break muscle down, so the gap between 1.6 and 2.2 grams matters less there than it does on a long stretch of eating below maintenance.
Checking your own log
Most people have no idea where they currently sit, and guessing is unreliable in both directions. Some people who think they eat "loads of protein" are at 1.0 grams per kilo. Others who never think about it are already past 1.6 because of how they happen to eat.
Pull up the last two weeks of your food log, or log normally for two weeks if you have none. Rough logging is fine for this; you are after a ballpark, not a lab result. Average the daily protein, then divide by your weight in kilos. That one number tells you which row of the table you are in.
Then look at the shape. If the average looks fine but almost all of it lands at one meal, you have learned something the daily total hid. And if you are lifting regularly, set this number beside how many hard sets each muscle is getting in a week. Protein supports the training, and the training is the thing doing the building. Plenty of protein with very little hard work behind it changes almost nothing.
The honest limit
The 1.6 figure is an average across 49 trials with very different people in them, and the spread around it is wide for a reason. Where you sit inside that range depends on how long you have been training, your age, how much lean mass you carry and whether you are eating above or below maintenance, and no study can tell you exactly which point is yours.
It also describes muscle gained under supervised training, usually over a few months. It does not tell you how much protein helps with appetite, recovery from a hard week or anything else people sometimes claim for it. Those are separate questions with weaker evidence, and they deserve their own answers rather than borrowing this one's authority.
Adonae sets calorie and protein targets from your goal, then checks them against what you actually log, so your daily protein, how it is spread across meals and your training sit in the same place. Free to start, works with no account. Get it for Android, or use the web app.
