Most adult men need between 56 and 91 grams of protein per day, depending on body weight, activity level, and goals. The baseline recommendation is 0.8 grams per kilogram of body weight, which works out to about 56 grams for a 154-pound (70 kg) man. But that number is a minimum to prevent deficiency, not an optimal target, and most active men benefit from significantly more.
The Baseline for Sedentary Men
The standard Recommended Dietary Allowance for protein is 0.8 grams per kilogram of body weight per day. For a 180-pound (82 kg) man who doesn’t exercise much, that’s roughly 65 grams. This amount covers basic bodily functions: repairing cells, producing enzymes and hormones, and maintaining immune health. It’s enough to keep you from losing muscle if you’re relatively inactive, but it leaves little room for building or preserving muscle as you age.
Most American men already exceed this minimum through normal eating. A chicken breast, a cup of Greek yogurt, and a couple of eggs get you close to 65 grams on their own. The real question for most men isn’t whether they’re hitting the bare minimum but whether they’re eating enough for their specific situation.
How Much You Need to Build Muscle
If you’re lifting weights or doing resistance training with the goal of gaining muscle, the research points to a clear target: 1.6 grams per kilogram of body weight per day. A large meta-analysis found that beyond this threshold, additional protein didn’t produce measurably more muscle growth. For a 180-pound man, that translates to about 131 grams per day.
There is a range, though. Intakes up to 2.2 grams per kilogram (about 180 grams for that same 180-pound man) may offer a small additional benefit for some individuals, particularly those training at high volumes or those who are newer to lifting. If you’re somewhere in the 1.6 to 2.2 g/kg range, you’re covering your bases. Going above 2.2 g/kg hasn’t shown additional muscle-building benefits in any controlled studies.
Protein for Losing Weight Without Losing Muscle
When you’re eating fewer calories than you burn, your body doesn’t just pull energy from fat. It also breaks down muscle tissue for fuel. Higher protein intake counteracts this. In clinical trials comparing higher-protein diets (1.07 to 1.60 g/kg per day) against standard-protein diets (0.55 to 0.88 g/kg per day), the higher-protein groups consistently preserved more lean mass and maintained a higher resting metabolic rate, burning roughly 142 more calories per day at rest.
Protein also helps with appetite. It’s the most satiating macronutrient, meaning it keeps you fuller longer than the same number of calories from carbs or fat. If you’re cutting calories, aiming for at least 1.2 to 1.6 g/kg per day (roughly 100 to 131 grams for a 180-pound man) will help you hold onto muscle while the scale moves down. Intakes up to 1.66 g/kg per day during a calorie deficit have been shown to pose no health risks.
Why Older Men Need More
After about age 50, your body becomes less efficient at using dietary protein to repair and build muscle. This means older men need more protein per meal to get the same muscle-preserving effect that younger men get from a smaller amount. The consequence of not adapting is sarcopenia, the gradual loss of muscle mass and strength that accelerates falls, fractures, and loss of independence.
The most practical recommendation for men over 65 is to include 25 to 30 grams of high-quality protein at each meal rather than loading it all into dinner (a common pattern). Research suggests that going above 30 grams in a single meal becomes an inefficient way to stimulate muscle repair in older adults. Three meals with 25 to 30 grams each gets you to 75 to 90 grams per day, which is well above the RDA and aligns with what the evidence supports for preserving muscle in aging men.
How to Spread Protein Across the Day
Your body can only use so much protein at once for muscle repair. In younger men, muscle protein synthesis peaks at about 20 to 25 grams of high-quality protein per meal. In older men, that ceiling rises to around 40 grams per serving because the muscle-building response is blunted. Anything beyond those amounts still gets used for energy or other bodily processes, but it won’t contribute to additional muscle repair.
The practical recommendation is to eat protein across at least four meals or snacks per day. If you’re aiming for 1.6 g/kg daily, that works out to roughly 0.4 g/kg per meal. For a 180-pound man, that’s about 33 grams per sitting, four times a day. If you’re targeting the higher end of 2.2 g/kg, you’d need about 0.55 g/kg per meal, or roughly 45 grams four times daily.
Each meal should also contain enough of the amino acid leucine, which acts as the trigger for muscle protein synthesis. The threshold is about 2 to 3 grams of leucine per meal. Most animal-based protein sources hit this easily: a chicken breast, a scoop of whey protein, or a cup of cottage cheese all deliver 2 or more grams of leucine. Plant-based proteins can reach this threshold too, but you typically need larger portions or combinations of sources like legumes, tofu, and whole grains.
Upper Limits and Safety
Long-term protein intake of up to 2 grams per kilogram per day is considered safe for healthy adults. That’s about 164 grams for a 180-pound man. The tolerable upper limit for people who have gradually adapted to high-protein diets is 3.5 g/kg per day, though few people would need or benefit from that much.
Chronic intake above 2 g/kg per day has been linked to digestive issues, increased strain on the kidneys, and potential vascular effects. This doesn’t mean a single high-protein day is dangerous, but consistently eating well above 2 g/kg without a specific reason (such as elite athletic training with professional guidance) isn’t supported by the evidence. If you have existing kidney disease, even moderate increases above the RDA warrant a conversation with your doctor, as your kidneys may not handle the additional filtering load.
Quick Reference by Goal
- Sedentary or lightly active: 0.8 g/kg per day (about 56 to 72 grams for most men)
- Losing weight while preserving muscle: 1.2 to 1.6 g/kg per day (about 100 to 131 grams for a 180-pound man)
- Building muscle with resistance training: 1.6 to 2.2 g/kg per day (about 131 to 180 grams for a 180-pound man)
- Men over 65 preventing muscle loss: 25 to 30 grams of protein per meal, at least three meals per day
- Safe upper limit for long-term intake: 2 g/kg per day for most healthy adults