The numbers you see online—50 grams, 100 grams, “one gram per pound of bodyweight”—are all defensible for someone, and all misleading if you don’t know which person. Your actual protein target depends on your body weight, how active you are, whether you’re losing weight, and where your protein comes from.
The short answer
Sedentary adults need around 0.8 grams per kilogram of bodyweight. Moderately active people do well with 1.2–1.6 g/kg. Athletes and those actively building muscle benefit from 1.6–2.2 g/kg. Older adults (65+) need closer to 1.0–1.2 g/kg minimum to maintain muscle mass. If you’re eating at a calorie deficit or relying heavily on plant-based protein, add 10–20% to your calculated target.
The baseline: where 0.8 g/kg comes from
The Recommended Dietary Allowance (RDA) for protein is 0.8 grams per kilogram of bodyweight per day for adults. This figure comes from nitrogen balance studies—research that measures how much protein you need to avoid losing muscle tissue when you’re sedentary and healthy.
For a 70 kg (154 lb) person, that’s 56 grams of protein per day. For a 60 kg (132 lb) person, it’s 48 grams.
This is a minimum to prevent deficiency, not an optimal intake for performance, recovery, or aging well. The RDA was designed to cover the needs of 97-98% of the general population, but it doesn’t account for physical activity, muscle-building goals, calorie deficits, or the physiological changes that come with age.
Why your actual target depends on what you do
Protein needs scale with activity because exercise—especially resistance training—increases muscle protein turnover. Your body breaks down more muscle tissue during and after a workout, and it needs amino acids to rebuild and adapt.
Here’s where the evidence lands for different scenarios:
| Scenario | Protein per kilogram bodyweight | Example (70 kg / 154 lb person) |
|---|---|---|
| Sedentary adult | 0.8 g/kg | 56 g/day |
| Lightly active (walking, yoga) | 1.0–1.2 g/kg | 70–84 g/day |
| Moderately active (regular gym, running) | 1.2–1.6 g/kg | 84–112 g/day |
| Endurance athlete | 1.2–1.6 g/kg | 84–112 g/day |
| Strength training (maintenance) | 1.6–1.8 g/kg | 112–126 g/day |
| Serious muscle building | 1.8–2.2 g/kg | 126–154 g/day |
| During calorie deficit | High end of activity range + 10–20% | e.g., 1.4–1.6 g/kg for lightly active |
These ranges come from systematic reviews and position stands by sports nutrition bodies, not single studies or anecdote. The International Society of Sports Nutrition recommends 1.4–2.0 g/kg for active individuals, with the upper end for those in a calorie deficit or pursuing muscle hypertrophy.
If you’re losing weight: Protein needs shift upward. When you’re eating fewer calories, your body is more likely to break down muscle for energy unless you give it a reason not to. A lightly active person maintaining weight might do fine with 1.0–1.2 g/kg, but the same person eating at a deficit should target 1.4–1.6 g/kg to preserve muscle mass. If you’re strength training while cutting, aim for the high end of your activity range (1.8–2.2 g/kg).
To calculate your daily protein target: multiply your body weight in kilograms by the number that matches your activity level. If you weigh 80 kg and lift weights three times a week, you’d aim for 128–144 grams per day (1.6–1.8 g/kg).
How much protein per meal actually matters
You can’t absorb unlimited protein in one sitting. Research on muscle protein synthesis shows that roughly 20–40 grams of protein per meal maximizes the anabolic response for most people. Consuming more than 40–50 grams in a single meal doesn’t build proportionally more muscle—your body oxidizes the excess for energy or converts it to other compounds.
Here’s what that looks like in real food:
- Two eggs + one cup plain Greek yogurt ≈ 30g
- Single 6 oz chicken breast ≈ 35g
- 1.5 cups cooked lentils ≈ 27g
- Whey protein shake (one scoop) + 12 oz milk ≈ 32g
If your daily target is 120 grams, spreading that across three meals (40g each) or four meals (30g each) is more effective than eating 20 grams at breakfast and 100 grams at dinner. This is especially true for older adults, whose muscles are less responsive to protein and benefit from consistent dosing throughout the day.
This doesn’t mean you need to obsess over every meal. If you hit 15 grams at one meal and 45 at another, you’re fine. The point is that doubling up one meal to “make up” for skipping protein earlier yields diminishing returns.
Plant-based protein: why the math changes slightly
Plant proteins have lower bioavailability than animal proteins—they’re harder to digest, and many are incomplete, meaning they’re low in one or more of the nine essential amino acids your body can’t make on its own. This doesn’t mean plant protein “doesn’t count,” but it does mean vegetarians and vegans should aim for 1.1–1.2 times their calculated protein target.
If your activity level suggests 100 grams per day, target 110–120 grams if you’re eating mostly or entirely plant-based.
You also need variety. A diet built entirely on rice or beans will leave you short on certain amino acids. Pairing complementary sources throughout the day covers the gaps:
- Beans + rice (lysine from beans, methionine from rice)
- Lentils + seeds (lysine from lentils, methionine from seeds)
- Hummus + whole-grain pita
- Peanut butter + whole-grain bread
You don’t need to combine them in the same meal—the old “complementary protein” rule has been debunked. Eating a variety of plant proteins across the day is enough.
Older adults: why the baseline shifts
One of the most under-recognized findings in protein research is that older adults—roughly 65 and older—need more protein than younger adults to maintain muscle mass and function, not less.
The reason is anabolic resistance: as we age, our muscles become less responsive to the anabolic (muscle-building) signal from dietary protein. A dose of protein that triggers muscle synthesis in a 30-year-old may do little for a 70-year-old. This resistance accelerates sarcopenia (age-related muscle loss) and contributes to frailty, falls, and loss of independence.
A 2013 expert consensus led by Bauer and colleagues recommended that healthy older adults consume 1.0–1.2 g/kg per day—25-50% higher than the standard RDA—and consider going higher (up to 1.5 g/kg) if they’re recovering from illness, injury, or malnutrition. A 2014 position paper by Deutz and others reached similar conclusions, noting that current RDA levels are insufficient to preserve muscle in aging populations.
For a 65 kg older adult, this shifts the target from 52 grams per day (RDA) to 65–78 grams minimum. That difference—an extra 13–26 grams—can be the difference between maintaining independence and losing functional capacity.
Older adults also benefit more from distributing protein evenly across meals (25–30 grams per meal, three times a day) rather than backloading it at dinner.
What about protein timing?
You’ve probably heard that you need to consume protein within 30 minutes of a workout, or that eating protein before bed builds more muscle. The evidence doesn’t support either claim as a make-or-break factor.
A 2013 meta-analysis by Schoenfeld and colleagues examined 23 studies on protein timing and muscle growth. The conclusion: total daily protein intake matters far more than when you eat it. The so-called “anabolic window” isn’t a narrow post-workout slot—it’s more like an open barn door that lasts several hours.
This doesn’t mean timing is irrelevant. Spreading protein across three or four meals (rather than backloading it all at dinner) offers a measurable advantage for muscle protein synthesis, especially in older adults. But if you’re hitting your daily protein target and distributing it reasonably, obsessing over the clock is mostly noise.
The myths worth clearing up
“High protein damages your kidneys”
In healthy individuals with normal kidney function, high protein intakes (even above 2 g/kg) do not cause kidney damage. This myth stems from the fact that people with existing chronic kidney disease are often told to restrict protein to slow disease progression. The Kidney Disease: Improving Global Outcomes (KDIGO) guidelines make this distinction clear: protein restriction is a treatment for kidney disease, not a preventive measure for healthy kidneys.
If you have chronic kidney disease, diabetes, or other conditions affecting kidney function, follow your doctor’s guidance. For everyone else, the evidence does not support fear of dietary protein.
“Excess protein is stored as fat”
Protein can be converted to glucose (via gluconeogenesis) or oxidized for energy, and in a calorie surplus, yes, excess energy—from any macronutrient—can be stored as fat. But protein is the least efficiently stored macronutrient. Your body prioritizes using it for tissue repair, enzyme production, and immune function before considering fat storage. In practice, overconsuming protein in the context of a normal diet is far less likely to drive fat gain than overconsuming carbs or fat.
“Plant protein doesn’t count as much as animal protein”
Plant proteins are often lower in one or more essential amino acids (particularly leucine and lysine), and some are less digestible than animal proteins. But this doesn’t mean they “don’t count.” It means you may need slightly more total protein if your diet is entirely plant-based—closer to 1.1–1.2 times your calculated target—and you should eat a variety of plant protein sources (legumes, grains, nuts, seeds) to cover all essential amino acids throughout the day.
FAQ
Can you eat too much protein?
For healthy individuals, there’s no strong evidence of harm from protein intakes up to 2.5 g/kg per day. Beyond that, you’re mostly crowding out other nutrients and spending more money for no additional benefit. If you have kidney disease or certain metabolic conditions, high protein may not be appropriate—check with your doctor.
Do I need protein powder?
No. Protein powder is convenient, not necessary. You can meet any reasonable protein target with whole foods: chicken, fish, eggs, dairy, legumes, tofu, tempeh. Powder is useful if you struggle to hit your target through food alone, or if you need a quick option post-workout.
How do I know if I’m getting enough protein?
If you’re maintaining muscle mass, recovering well from workouts, and not constantly hungry, you’re probably fine. If you’re losing muscle, feeling weak, or recovering poorly despite adequate training, low protein is one possible culprit. Tracking intake for a few days (using an app or food log) can tell you where you actually stand versus where you think you are.
Does protein help with weight loss?
Yes, indirectly. Protein is the most satiating macronutrient—it keeps you fuller longer, which can reduce overall calorie intake. It also has a higher thermic effect (your body burns more calories digesting protein than carbs or fat), and it helps preserve muscle mass during a calorie deficit. A higher protein intake (1.6–2.2 g/kg) is a common strategy in fat loss phases for these reasons.
Your daily protein target isn’t a mystery—it’s just math based on your weight, what you ask your body to do, and where your protein comes from. If you’re sedentary, 0.8 g/kg keeps you in nitrogen balance. If you’re active, aging, losing weight, or eating plant-based, aim higher. Spread it across meals rather than loading one sitting, and you’ve covered the essentials.
This article is for general information only and is not a substitute for professional medical advice. If you have kidney disease, metabolic disorders, or other health conditions, consult your healthcare provider before making significant changes to your protein intake.
Sources
- National Institutes of Health, Dietary Reference Intakes for Energy, Carbohydrate, Fiber, Fat, Fatty Acids, Cholesterol, Protein, and Amino Acids (2005)
- International Society of Sports Nutrition Position Stand: Protein and Exercise (2017)
- Bauer J, et al. Evidence-based recommendations for optimal dietary protein intake in older people: a position paper from the PROT-AGE Study Group. J Am Med Dir Assoc 2013;14(8):542-559
- Deutz NEP, et al. Protein intake and exercise for optimal muscle function with aging: recommendations from the ESPEN Expert Group. Clin Nutr 2014;33(6):929-936
- Schoenfeld BJ, Aragon AA, Krieger JW. The effect of protein timing on muscle strength and hypertrophy: a meta-analysis. J Int Soc Sports Nutr 2013;10:53
- Kidney Disease: Improving Global Outcomes (KDIGO) Clinical Practice Guideline for the Management of Blood Pressure in Chronic Kidney Disease (2012)