Most healthy adults need at least 0.36 grams of protein per pound of body weight per day. For a 150-pound person, that works out to about 54 grams. For someone at 200 pounds, it’s roughly 72 grams. But that baseline number is a minimum to prevent deficiency, not necessarily the amount that keeps you feeling strong, full, and functioning at your best.
The Baseline: 0.36 Grams Per Pound
The official Recommended Dietary Allowance (RDA) for protein is 0.8 grams per kilogram of body weight, which translates to 0.36 grams per pound. This number was set to cover the basic needs of most sedentary adults. It prevents muscle wasting and keeps essential body functions running, but it wasn’t designed with fitness goals, weight loss, or aging in mind.
Here’s what the RDA looks like at common body weights:
- 130 lbs: ~47 g protein per day
- 150 lbs: ~54 g protein per day
- 180 lbs: ~65 g protein per day
- 200 lbs: ~72 g protein per day
Most nutrition researchers now consider this a floor, not a target. If you’re active, trying to lose weight, or over 65, your needs are likely higher.
How Activity Level Changes Your Needs
If you exercise regularly, your muscles break down and rebuild more tissue than a sedentary person’s. That rebuilding process requires amino acids from protein. People who do strength training, run, cycle, or play sports typically benefit from 0.5 to 0.9 grams per pound of body weight per day, depending on intensity.
For a 160-pound person who lifts weights three or four times a week, that range means roughly 80 to 144 grams daily. If you’re trying to build muscle while eating in a calorie surplus, aiming toward the higher end of that range helps supply the raw materials your body needs. If you’re trying to lose fat while preserving muscle (a common goal during dieting), higher protein intake becomes even more important because it helps protect lean mass when calories are restricted.
Protein Needs After 65
Nearly half of all the protein in your body is found in muscle, and muscle mass naturally declines with age. This gradual loss, called sarcopenia, accelerates after 65 and increases the risk of falls, fractures, and loss of independence. The standard RDA of 0.36 grams per pound doesn’t account for this shift.
Researchers now recommend that older adults consume 1.0 to 1.2 grams of protein per kilogram of body weight, or roughly 0.45 to 0.55 grams per pound. For a 160-pound older adult, that means 72 to 88 grams per day. Pairing higher protein intake with regular resistance or endurance exercise produces the strongest results for maintaining muscle health with age.
How to Spread Protein Across Meals
Your body can only use so much protein at once for muscle repair. Eating 100 grams of protein in one sitting and very little the rest of the day is less effective than spreading it out. Research on meal frequency found that consuming 30 to 45 grams of protein per meal produced the strongest association with leg muscle mass and strength. A study on beef protein found that 30 grams in a single serving was enough to maximize the muscle-building response, and eating more than that in one sitting didn’t provide additional benefit.
This means three or four meals each containing 25 to 40 grams of protein is a more effective strategy than loading everything into dinner. A practical way to think about it: a palm-sized portion of chicken, fish, or tofu at each meal, plus protein-rich snacks like Greek yogurt or eggs, gets most people to their daily target without much effort.
Where to Get Your Protein
Not all protein sources are equal. Animal proteins like chicken, fish, eggs, and dairy contain all the essential amino acids your body can’t make on its own, in proportions that closely match what your muscles need. They’re also rich in leucine, an amino acid that plays a central role in triggering muscle repair.
Plant-based proteins from beans, lentils, tofu, tempeh, and whole grains can absolutely meet your needs, but individual plant foods tend to be lower in one or more essential amino acids. Eating a variety of plant proteins throughout the day covers those gaps. You don’t need to combine them in a single meal, just across the day.
Can You Eat Too Much Protein?
For healthy people, high-protein diets are not known to cause medical problems. Your kidneys filter the waste products of protein metabolism, and in people with normal kidney function, higher protein intake doesn’t appear to cause damage.
The picture changes if you already have kidney disease. A high-protein diet can worsen kidney function because the body may struggle to clear all the metabolic byproducts. People with diabetes or other chronic conditions should also be cautious, since these conditions can affect kidney health over time without obvious symptoms. If you have a preexisting kidney condition, getting guidance on your protein ceiling is worth the conversation.
A Quick Way to Find Your Number
Rather than memorizing formulas, here’s a simple approach. Take your weight in pounds and multiply it by the factor that matches your situation:
- Sedentary adult: body weight × 0.36
- Recreationally active: body weight × 0.5 to 0.7
- Serious strength training or fat loss: body weight × 0.7 to 0.9
- Over 65: body weight × 0.45 to 0.55
If you’re significantly overweight, using your goal weight or lean body mass instead of current weight gives a more realistic target, since excess body fat doesn’t increase protein requirements the way muscle does.
For most people, landing somewhere between 0.5 and 0.7 grams per pound, spread across three or four meals, hits the sweet spot between the bare minimum and the diminishing returns of very high intake. Track your intake for a few days using a food app, and you’ll quickly see whether you’re undershooting or already on target.