Most adults need at least 0.8 grams of protein per kilogram of body weight per day, which works out to about 0.36 grams per pound. For a 150-pound person, that’s roughly 54 grams daily. But that number is a minimum to prevent deficiency, not an optimal target, and your actual needs depend heavily on your age, activity level, and goals.
The Baseline for Sedentary Adults
The Recommended Dietary Allowance of 0.8 g/kg was designed for healthy adults who aren’t particularly active. It’s enough to keep your body functioning and prevent muscle wasting, but most nutrition experts now consider it a floor rather than a ceiling. If you’re generally healthy and don’t exercise much, eating somewhere between 0.8 and 1.0 g/kg is reasonable. For quick math: take your weight in pounds, divide by three, and you’ll land close to the minimum.
How Exercise Changes Your Needs
If you work out regularly, your protein needs jump significantly. People who exercise consistently need about 1.1 to 1.5 grams per kilogram of body weight. If you lift weights or train for endurance events like running or cycling, the range climbs to 1.2 to 1.7 g/kg. For a 180-pound person who lifts weights, that translates to roughly 98 to 139 grams per day.
Intake above 2 grams per kilogram per day is generally considered excessive. Beyond that point, your body doesn’t use the extra protein for muscle building. It simply breaks it down for energy or stores it, offering no additional benefit for performance or recovery.
Protein Needs After 65
Aging muscles become less efficient at using dietary protein, which means older adults need more of it to maintain the same muscle mass. The European Society for Clinical Nutrition and Metabolism recommends at least 1.0 to 1.2 g/kg per day for healthy adults over 65. For older adults dealing with an acute illness or chronic condition, that recommendation rises to 1.2 to 1.5 g/kg, and people recovering from severe illness or injury may need even more.
This matters because muscle loss accelerates with age. Without adequate protein paired with some form of resistance activity, older adults lose muscle mass at a rate that eventually affects mobility, balance, and independence. Hitting these higher protein targets is one of the most effective ways to slow that process down.
Protein for Weight Loss
Protein becomes especially important when you’re eating fewer calories than you burn. It does two things that other nutrients don’t do as well: it keeps you full longer because it takes more time to digest, and it protects your muscle mass while your body sheds fat. Without enough protein during a calorie deficit, a meaningful portion of the weight you lose comes from muscle rather than fat.
For weight loss, aiming for 10% to 35% of your total calories from protein is the standard range, but most people benefit from pushing toward the higher end of that range. Your body can only absorb and use about 25 to 35 grams of protein at a time, so spreading your intake across meals matters more than loading up at dinner.
During Pregnancy and Breastfeeding
Protein needs increase gradually during pregnancy. In the first trimester, the increase is negligible, just a gram or two above your normal intake. By the second trimester, you need roughly 9 to 10 extra grams per day. In the third trimester, that jumps to about 28 to 31 extra grams daily as the baby’s growth accelerates.
During breastfeeding, you need about 19 additional grams per day for the first six months if you’re exclusively nursing. After six months, when babies start eating solid foods and nurse less, the extra requirement drops to around 13 grams. The good news is that most women who are eating enough total calories will meet these protein targets through a normal, varied diet without needing to track numbers closely.
Spreading Protein Across Meals
How you distribute protein throughout the day matters nearly as much as how much you eat in total. A study comparing even protein distribution (about 30 grams at each of three meals) to a skewed pattern (most protein at dinner) found that even distribution produced 25% more muscle protein synthesis over 24 hours, even though total protein intake was identical.
The typical eating pattern for most people is a low-protein breakfast (think toast or cereal), a moderate lunch, and a large protein-heavy dinner. Shifting some of that dinner protein to breakfast and lunch can make a measurable difference in how effectively your body uses it. Aiming for 25 to 35 grams per meal is a practical target for most adults.
Plant Protein vs. Animal Protein
Not all protein is created equal when it comes to how well your body absorbs and uses it. Animal proteins like eggs, milk, and beef score near 100% on digestibility scales, while plant proteins score lower. Wheat protein, for example, scores about 42% on the standard quality index, compared to 92% for beef and 118% for eggs.
The main issue with plant proteins isn’t that they’re incomplete in some absolute sense. It’s that they tend to be lower in specific amino acids your muscles need. Wheat is low in lysine, for instance. Combining different plant proteins, like grains with legumes, compensates for these gaps. If you eat a fully plant-based diet, increasing your total protein intake by 10% to 20% above standard recommendations is a reasonable adjustment to account for lower digestibility and amino acid balance.
One amino acid worth knowing about is leucine, which acts as a trigger for muscle building. You need roughly 2 to 3 grams of leucine per meal to fully activate that process. Animal proteins naturally deliver this amount in a typical serving, while plant-based meals often fall short unless you’re intentional about portions or combining sources.
Should You Use Total Weight or Lean Weight?
All of the per-kilogram recommendations above are based on total body weight, which works well for people at a healthy weight. But if you’re carrying a significant amount of extra body fat, using total body weight can overshoot your actual protein needs. Fat tissue doesn’t require protein the way muscle does.
Research comparing calculations based on total body weight versus fat-free mass found clinically meaningful overestimates in 78% to 100% of participants with overweight or obesity. If you’re significantly above a healthy weight, a more practical approach is to calculate based on your goal weight or, if you know it, your lean body mass. This gives you a protein target that reflects how much metabolically active tissue you’re actually fueling.
Is Too Much Protein Dangerous?
For people with healthy kidneys, high-protein diets are not known to cause medical problems. The longstanding concern that excess protein damages kidneys has not held up in research on healthy individuals. If you already have kidney disease, though, high protein intake can accelerate damage, and your intake should be managed with medical guidance.
The practical upper boundary for most people is around 2 g/kg per day. Beyond that, you’re unlikely to see additional muscle or performance benefits, and you may be displacing other important nutrients like fiber, healthy fats, and micronutrients from your diet.