How much protein do you need per day?

Our coaches hold the NSCA Certified Strength and Conditioning Specialist (CSCS) credential and have set daily protein targets for thousands of lifters inside Nishaana — from beginners eating too little to cut dieters trying to hold every gram of muscle. This guide pulls the strongest peer-reviewed evidence — Morton's protein meta-analysis, the ISSN position stand, and the PROT-AGE recommendations for older adults — into one clear daily number for your goal and bodyweight. Every claim is cited, and you can log every gram free in the Nishaana nutrition tracker. For the wider picture, start with the nutrition guide.

How much protein do you actually need per day?

To build muscle, eat 1.6-2.2 grams of protein per kilogram of bodyweight per day. Morton's 2018 meta-analysis of 49 studies and 1,863 people found that muscle gains from resistance training stopped rising past about 1.62 g/kg — so anything in the 1.6-2.2 band covers you, with the upper end as a buffer for hard trainers. [1]

That is the single most robust number in sports nutrition, and it keeps showing up. Tagawa's 2020 dose-response meta-analysis in Nutrition Reviews reached the same neighbourhood: muscle mass increased with protein intake up to a point, then flattened. [2] The ISSN's protein position stand recommends 1.4-2.0 g/kg for active people, landing squarely inside the same window. [3] When three independent reviews converge, you can stop second-guessing the target.

Note the units. This is grams per kilogram of bodyweight, not per pound and not per kilo of lean mass (unless you are very lean and dieting, where lean-mass math starts to matter). The government RDA of 0.8 g/kg is a floor to prevent deficiency in sedentary adults — it is not a target for anyone lifting weights and trying to grow. [9] Run your own number with the protein calculator, or read how it fits your other macros (guide coming soon).

How much protein do you need when cutting?

In a calorie deficit, raise protein to 2.0-2.4 g/kg of bodyweight per day. When you are eating less, muscle is the tissue most at risk, and more protein protects it. Helms's evidence-based bodybuilding review recommends the higher end of the range precisely because lean lifters in a cut need the extra insurance against muscle loss. [5]

The logic is simple. A calorie deficit forces your body to pull energy from somewhere, and without enough dietary protein it will break down more muscle to get it. Higher protein tilts that balance back toward keeping the muscle you worked for. The leaner you already are, the more this matters — contest-lean athletes may go even higher, toward 2.3-3.1 g/kg of lean mass, per Helms's recommendations for the final weeks of a prep. [5]

There is a bonus. Protein is the most filling macro and the most expensive to digest, so keeping it high makes a deficit noticeably easier to stick to (more on that in the fat-loss section). Set your calorie ceiling first with the TDEE calculator and your maintenance number, then lock protein in before you fill the rest with carbs and fats.

How much protein is that in grams for your bodyweight?

Multiply your bodyweight in kilograms by 1.6 to 2.2 for the muscle-building range, or by 2.0 to 2.4 if you are dieting. A 70 kg (154 lb) lifter needs roughly 112-154 g per day to build, and 140-168 g in a cut. The table below does the maths for common bodyweights in both kilograms and pounds.

Which number inside the range should you pick? Match it to your goal. Most people building muscle at maintenance or a slight surplus do fine at 1.6-1.8 g/kg; there is no need to force down more. Push toward the top of the band (or into the cutting column) when calories are low, when you train very hard, or when you eat mostly plant protein, which tends to be lower in the amino acid leucine that triggers growth. [3] The per-goal table makes the choice explicit.

How should you spread protein across the day?

Split your daily protein across 3-5 meals of roughly 0.3-0.4 g/kg each. Schoenfeld and Aragon's review of per-meal distribution suggests about 0.4 g/kg per serving maximises muscle protein synthesis, so a 75 kg lifter would target around 30 g of protein per meal across four meals to hit their daily number. [4]

Each protein-rich meal switches on muscle protein synthesis for a few hours, then it settles back to baseline. Eating protein several times a day keeps re-triggering that response instead of relying on one big hit. That is why cramming your entire target into dinner is a small mistake — you leave some of the anabolic signal unused earlier in the day.

Do not overthink it, though. The difference between three and five meals is a rounding error next to whether you hit your daily total at all. If four evenly spaced 30 g meals suit your schedule, great; if you would rather eat three bigger ones, that is fine too. Build each meal around a 25-40 g protein anchor and the distribution takes care of itself. Log it in the nutrition tracker and the running total does the checking for you.

Does protein timing around your workout matter?

Not much. Total daily protein is the dominant driver of muscle growth, and precise timing is a minor optimisation on top. The old idea of a narrow 30-minute post-workout "anabolic window" has not held up — getting a protein-containing meal within a few hours of training is enough for almost everyone. [4]

Researchers used to worry you had to slam a shake the moment you racked the bar. Later work showed the window is much wider than that, because your pre-workout meal is still being digested and elevating amino acids for hours. Schoenfeld and Aragon's distribution paper reframed the question away from the exact minute and toward sensible spacing across the whole day. [4]

So here is the honest order of priorities: hit your daily total, spread it across a few meals, and eat some protein reasonably close to training if it is convenient. The first item does 90% of the work. If chasing the perfect post-workout timing stresses you out, drop it — that energy is better spent making sure you actually reach 1.6-2.2 g/kg every day.

Is eating more than 2.2 g/kg harmful, or better?

Neither. Going above 2.2 g/kg does not build extra muscle — the gains flatten near 1.6 g/kg — but it is also not harmful in healthy people. Reviews and position stands report no adverse effect of high-protein diets on kidney or bone health in individuals with normal kidney function. [1] [8]

This is where a lot of gym advice goes wrong in both directions. One camp insists you need 3+ g/kg to grow, which the meta-analyses simply do not support: past roughly 1.6 g/kg the muscle-building curve is flat. [1] [2] The other camp warns that high protein "wrecks your kidneys," which is a myth for healthy people — the concern applies to those with pre-existing kidney disease, who should follow medical advice.

So more protein is safe but pointless for muscle beyond the range. The real cost of overshooting is opportunity cost: those calories could have been carbs to fuel training or fats for hormones, and the extra chicken breasts cost money. The two genuine reasons to sit at the top end are a hard deficit and appetite control, both covered below.

Do older adults need more protein?

Yes. Older adults need more protein per kilogram than younger ones because ageing muscle responds less strongly to it — a phenomenon called anabolic resistance. The PROT-AGE Study Group recommends 1.0-1.2 g/kg per day for healthy older people, and 1.2-1.5 g/kg or more for those who are active, ill, or trying to build muscle. [6]

After roughly age 50, the same dose of protein produces a smaller muscle-building response than it did at 25. The fix is a bigger signal: both a higher daily total and a larger per-meal dose, since older muscle needs around 25-40 g of high-quality protein in one sitting to fully switch on synthesis. [7] Spreading protein evenly across meals matters more with age, not less.

This is not a minor detail. Age-related muscle loss (sarcopenia) drives falls, frailty and loss of independence, and it accelerates when protein runs low. Older lifters who keep protein high and keep training with resistance hold onto strength far longer. The target creeps up with age, and the review literature on ageing and appetite reinforces that many older adults undereat protein exactly when they need more of it. [7]

How does protein help with fat loss and appetite?

Protein makes fat loss easier in two ways: it keeps you fuller for longer, and it costs more energy to digest than carbs or fat. A review of high-protein diets found they support weight loss by increasing satiety, raising the thermic effect of food, and helping preserve lean mass during a calorie deficit. [8]

Of the three macros, protein is the most satiating gram for gram, so a higher-protein diet tends to blunt hunger and reduce spontaneous calorie intake — which is why cut diets built on lean protein feel more sustainable than low-protein ones. On top of that, your body burns roughly 20-30% of protein's calories just digesting and processing it (its thermic effect), compared with under 10% for carbs and fats. [8]

Add the muscle-sparing effect from the deficit section and you get the full case for eating 2.0-2.4 g/kg while dieting: you keep more muscle, feel fuller, and burn a little extra just by eating it. None of this makes protein a fat-burner — calories still decide the direction — but it stacks the odds in your favour. Pair it with a modest deficit tracked in the nutrition tracker and use the macro calculator to split the rest.

What are the most common protein mistakes?

The usual protein mistakes are eating too little, obsessing over timing, and mismanaging protein while dieting. Fix the daily total first — most people who never track it fall well short of the 1.6 g/kg floor — before worrying about any finer detail.

• Eating far too little. — The most common problem by a mile. If you never track it, most people building muscle land near 1.0 g/kg — well under the 1.6 g/kg floor. Weigh your intake for a week and you will usually find a gap.
• Chasing more than 2.2 g/kg for muscle. — Beyond roughly 1.6 g/kg the muscle-building returns flatten. Extra grams are not harmful in healthy people, but they are calories and money better spent elsewhere unless you are dieting hard.
• Loading it all into dinner. — One giant 90 g hit at night wastes some of the anabolic signal. Spread protein across 3-5 meals of roughly 0.3-0.4 g/kg so muscle protein synthesis is stimulated several times a day.
• Obsessing over the post-workout window. — The old 30-minute rule is a myth. Total daily protein is what drives growth; a protein meal within a few hours of training is plenty for almost everyone.
• Counting incomplete protein like meat. — The number on the label matters, but so does quality. Plant sources are often lower in leucine, so if you eat mostly plants, aim toward the top of the range and vary your sources.
• Cutting calories but not raising protein. — A deficit is exactly when muscle is most at risk. Keep protein high (2.0-2.4 g/kg) even as total calories fall, or you will lose more muscle than you need to.

None of this is complicated. Set your number from the tables above, build each meal around a protein anchor, and let the daily total lead every other decision. If you want to go deeper on where those grams should come from, our best protein sources guide (coming soon) ranks whole foods by quality and cost, and the nutrition guide ties protein into the rest of your diet.

References

1. 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 (2018). British Journal of Sports Medicine
2. Tagawa R, et al. Dose-response relationship between protein intake and muscle mass increase: a systematic review and meta-analysis of randomized controlled trials (2020). Nutrition Reviews
3. Jäger R, et al. International Society of Sports Nutrition Position Stand: Protein and Exercise (2017). Journal of the International Society of Sports Nutrition
4. Schoenfeld BJ, Aragon AA. How much protein can the body use in a single meal for muscle-building? Implications for daily protein distribution (2018). Journal of the International Society of Sports Nutrition
5. Helms ER, Aragon AA, Fitschen PJ. Evidence-based recommendations for natural bodybuilding contest preparation: nutrition and supplementation (2014). Journal of the International Society of Sports Nutrition
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 (2013). Journal of the American Medical Directors Association
7. Baum JI, Kim I-Y, Wolfe RR (review). Protein for Life: Review of Optimal Protein Intake, Sustainable Dietary Sources and the Effect on Appetite in Ageing Adults (2018). Nutrients
8. Moon J, Koh G. Clinical Evidence and Mechanisms of High-Protein Diet-Induced Weight Loss (2020). Journal of Obesity & Metabolic Syndrome
9. Harvard T.H. Chan School of Public Health. Protein — The Nutrition Source. Harvard School of Public Health