Most healthy adults need at least 0.36 grams of protein per pound of body weight per day, which works out to about 55 grams for a 150-pound person. That number is the Recommended Dietary Allowance (RDA), and it represents the minimum to prevent deficiency, not necessarily the amount for optimal health. Your actual needs could be significantly higher depending on your age, activity level, and goals.
The Baseline: 0.36 Grams Per Pound
The RDA of 0.8 grams per kilogram of body weight (0.36 grams per pound) was set to meet the needs of 97.5% of healthy, sedentary adults. For a 130-pound person, that’s roughly 47 grams a day. For someone at 180 pounds, it’s about 65 grams. These numbers keep you from losing muscle and maintain basic bodily functions, but they weren’t designed with fitness, aging, or weight loss in mind.
To put this in food terms, a chicken breast has about 30 grams of protein, a cup of Greek yogurt has around 15 to 20 grams, and two eggs provide roughly 12 grams. Hitting the minimum RDA isn’t difficult for most people eating a varied diet. The real question is whether the minimum is enough for you.
How Activity Level Changes the Target
If you exercise regularly, the RDA falls short. The International Society of Sports Nutrition recommends 1.4 to 2.0 grams per kilogram of body weight per day (roughly 0.64 to 0.91 grams per pound) for most people who work out. That range covers both endurance and resistance training. A 160-pound person doing regular strength training would aim for about 102 to 145 grams daily.
Where you fall within that range depends on your training intensity and goals. If you’re primarily running or cycling, staying closer to 1.4 g/kg is reasonable, with extra emphasis on carbohydrates for fuel. If you’re lifting weights and actively trying to build muscle, pushing toward 2.0 g/kg makes more sense. There’s even evidence that intakes above 3.0 g/kg per day may help resistance-trained individuals lose more fat, though that level of intake requires deliberate planning and isn’t necessary for most people.
Protein Needs After 65
Aging muscles become less responsive to protein. The same meal that triggers robust muscle repair in a 30-year-old produces a weaker response in a 70-year-old. To compensate, the PROT-AGE study group recommends that adults over 65 consume at least 1.0 to 1.2 grams per kilogram per day, roughly 25 to 50% more than the standard RDA. For a 155-pound older adult, that translates to about 70 to 85 grams daily.
Older adults who exercise should aim for the higher end, at or above 1.2 g/kg. Those dealing with acute or chronic illness may need 1.2 to 1.5 g/kg to support recovery and preserve function. The one exception: people with advanced kidney disease (significantly reduced kidney filtration) who are not on dialysis may need to limit protein. If that applies to you, your nephrologist will set a specific target.
Protein for Weight Loss
When you eat fewer calories than you burn, your body doesn’t just pull from fat stores. It also breaks down muscle for energy. Higher protein intake acts as a shield for that muscle. Research on calorie-restricted diets shows that groups eating significantly more protein (around 40% above normal levels) maintain their lean mass while losing more fat than groups eating standard amounts on the same calorie deficit.
Most sports nutrition and weight management guidelines suggest keeping protein at 1.2 to 1.6 g/kg per day while dieting. For a 170-pound person cutting calories, that means roughly 93 to 124 grams per day. This range helps preserve the muscle that keeps your metabolism running and prevents the “skinny-fat” outcome where you lose weight but end up weaker and less toned. Protein also keeps you fuller for longer, which makes sticking to a calorie deficit considerably easier.
Pregnancy and Breastfeeding
Protein needs rise gradually during pregnancy. In the first trimester, the increase is negligible, just a gram or so above your normal intake. By the second trimester, you need an additional 9 to 10 grams per day. The third trimester brings the biggest jump, with most guidelines recommending 17 to 31 extra grams daily on top of your baseline. For a woman who normally needs about 50 grams, that means up to 75 to 80 grams per day in late pregnancy.
During breastfeeding, the demand stays elevated. Exclusively nursing mothers need roughly 19 to 23 additional grams per day for the first six months. After six months, when babies start eating solid food and nursing frequency drops, the extra requirement falls to around 12 to 13 grams. Some guidelines simplify this to about 1.1 to 1.2 g/kg of body weight per day throughout lactation.
How to Spread Protein Across the Day
Your body can only use so much protein for muscle repair in a single sitting. Studies show that muscle-building peaks at around 30 grams of protein per meal. Eating 60 grams in one sitting doesn’t double the effect. The excess gets used for energy or other metabolic processes, but not for building more muscle.
Research on meal frequency found that people who consistently ate 30 to 45 grams of protein per meal had the greatest leg lean mass and strength. This suggests spreading your intake across three to four meals is more effective than cramming it into one or two large ones. If your target is 120 grams per day, three meals with 30 to 35 grams each plus a protein-rich snack gets you there more efficiently than a 70-gram dinner and two low-protein meals.
Plant vs. Animal Protein
Not all protein is created equal when it comes to digestibility. Animal proteins from meat, eggs, dairy, and fish contain all the essential amino acids in the proportions your body needs, and your gut absorbs them efficiently. Plant proteins from beans, lentils, grains, and soy tend to score lower on digestibility measures and are often missing or low in one or more essential amino acids.
This doesn’t mean plant-based diets can’t meet your protein needs. It means you may need to eat a bit more total protein to get the same muscle-building effect, and you should eat a variety of plant sources so that the amino acids from one food fill in the gaps of another. Soy and quinoa are among the plant proteins with the most complete amino acid profiles. If you eat a fully plant-based diet, aiming for the higher end of whatever protein range applies to you is a practical strategy.
Is Too Much Protein Bad for Your Kidneys?
This concern is one of the most persistent in nutrition, and for most people, it’s unfounded. In healthy individuals without kidney disease, higher protein intakes actually appear protective. A meta-analysis found that higher intakes of total protein, including both plant and animal sources, were associated with an 18% lower risk of developing chronic kidney disease. Higher plant protein intake specifically was linked to a 23% lower risk.
What happens in healthy kidneys is that they adapt to increased protein by filtering more efficiently. This adaptive response, sometimes called hyperfiltration, is a normal physiological adjustment, not a sign of damage. The situation is different for people who already have kidney disease. Clinical guidelines recommend that individuals with moderate to advanced kidney impairment stick to 0.8 g/kg per day or follow their doctor’s specific guidance. But for the general population, protein intakes of 1.2 to even 2.0 g/kg have not been shown to harm kidney function.
Quick Reference by Body Weight
- 130-pound sedentary adult: minimum 47 g/day (RDA), likely better at 59–71 g
- 150-pound regular exerciser: 95–136 g/day
- 180-pound person building muscle: 115–164 g/day
- 155-pound adult over 65: 70–85 g/day (more if active or ill)
- 150-pound person losing weight: 82–109 g/day
These ranges give you a starting point. Your sweet spot depends on how active you are, whether you’re trying to change your body composition, and how your body responds over time. Tracking your intake for a few days with a food app can reveal whether you’re consistently hitting your target or falling short.