Most adults should get 10% to 35% of their daily calories from protein, with a baseline minimum of 0.8 grams per kilogram of body weight (about 0.36 grams per pound). For a 150-pound person, that works out to roughly 54 grams per day as a floor. But where you land within that wide range depends on your age, activity level, and goals.
The Baseline: How Much You Need at Minimum
The Recommended Dietary Allowance of 0.8 grams per kilogram of body weight is designed to meet the basic needs of most healthy, sedentary adults. It prevents deficiency, but it’s not necessarily the amount that optimizes your health. For a 180-pound person, this comes to about 65 grams of protein per day. For someone weighing 130 pounds, it’s closer to 47 grams.
The federal Acceptable Macronutrient Distribution Range sets protein at 10% to 35% of total calories for all adults over 19. At a 2,000-calorie diet, 10% is just 50 grams and 35% is 175 grams. That’s an enormous gap, which is why the percentage alone isn’t very helpful without context about what you’re trying to accomplish.
Why More Protein Helps With Weight Management
Protein is the most filling macronutrient, and it’s not particularly close. In controlled studies, people eating 30% of their calories from protein reported significantly greater fullness throughout the day compared to those eating only 10% from protein. A separate 16-week trial found that participants on a 34% protein diet felt more satisfied after meals than those eating 18% protein, even when total calorie intake was the same.
Part of this comes down to how your body processes protein. Digesting protein burns 15% to 30% of the calories it contains, a phenomenon called the thermic effect of food. Carbohydrates burn only 5% to 10% during digestion, and fats burn 0% to 3%. So 200 calories of chicken breast costs your body meaningfully more energy to process than 200 calories of bread or butter. This doesn’t transform your metabolism on its own, but it adds up over weeks and months.
There’s also consistent evidence that modestly increasing protein while controlling total calories improves body composition, meaning you lose more fat and retain more muscle during weight loss. If you’re actively trying to lose weight, aiming for 25% to 30% of calories from protein is a practical target that balances satiety with realistic meal planning.
Protein Needs for Strength Training
If you lift weights or do other resistance training regularly, your protein needs are roughly double the baseline RDA. A large meta-analysis published in the British Journal of Sports Medicine found that protein intake of about 1.6 grams per kilogram of body weight per day was sufficient to maximize muscle growth during resistance training. That’s 116 grams daily for a 160-pound person.
Going above 1.6 g/kg didn’t produce additional muscle gains on average, but because individual responses vary, the researchers noted that up to 2.2 g/kg per day may be reasonable for people trying to maximize results. For that same 160-pound person, that upper end is about 160 grams per day. Beyond that threshold, extra protein doesn’t appear to build more muscle.
Older Adults Need More Than the Standard
After about age 65, the body becomes less efficient at using dietary protein to maintain muscle. This gradual muscle loss, called sarcopenia, accelerates with age and contributes to falls, fractures, and loss of independence. The standard 0.8 g/kg recommendation isn’t enough to slow this process effectively.
Researchers now recommend that older adults consume 1.0 to 1.2 grams of protein per kilogram of body weight daily. For a 160-pound older adult, that means 73 to 87 grams per day rather than the 58 grams the baseline RDA would suggest. Spreading protein intake across all meals rather than loading it into dinner appears to be more effective for muscle maintenance, since the body can only use so much at once for muscle repair.
Animal vs. Plant Protein Sources
Animal proteins generally contain all the essential amino acids in the proportions your body needs, and they’re more digestible. Research comparing animal-based and plant-based foods using digestibility scoring systems consistently shows higher scores for meat, eggs, and dairy. That doesn’t mean plant protein is inadequate, but it does mean you need to eat a wider variety of plant sources to cover all your amino acid needs.
Combining grains with legumes, or nuts with whole grains, across the course of a day fills in the gaps. You don’t need to combine them at every single meal, just over the day as a whole. If you eat entirely plant-based, aiming slightly higher on total protein intake helps compensate for the lower digestibility of individual sources.
What Common Foods Actually Provide
Knowing your target in grams is only useful if you can translate it into real food. Here’s what standard portions deliver:
- One large egg: about 6 grams of protein, regardless of how it’s cooked
- Chicken breast (raw light meat from one pound of chicken): about 20 grams
- Firm tofu, half cup: about 22 grams
- Greek yogurt, one cup: roughly 15 to 20 grams depending on the brand
- Cooked lentils, one cup: roughly 18 grams
A breakfast of three eggs and a piece of toast gives you about 21 grams. A lunch with a cup of lentil soup and a side salad adds another 18 or so. A dinner with a chicken breast gets you past 20 more. With a snack of Greek yogurt, you’re well above 70 grams for the day without any supplements or special planning. For most people at a healthy weight with moderate activity, that’s solidly within a good range.
Finding Your Personal Target
Rather than fixating on a single number, think in terms of ranges that match your situation. Sedentary adults can aim for 0.8 to 1.0 g/kg. Older adults or anyone concerned about preserving muscle should target 1.0 to 1.2 g/kg. People doing regular strength training benefit from 1.6 to 2.2 g/kg. And if you’re losing weight, keeping protein at 25% to 30% of calories helps you stay full and preserve lean mass.
As a quick calculation: multiply your weight in pounds by 0.36 for the absolute minimum, by 0.55 for a moderate active-adult target, and by 0.73 for the strength-training range. Those three numbers give you a practical spectrum to work within, and you can adjust based on how satisfied you feel after meals and how your body responds over time.