Ask three reliable sources how much protein you need, and you can get three different answers. The National Academies’ long-standing adult figure is 0.8 grams per kilogram of body weight. The 2025-2030 Dietary Guidelines for Americans, released in January 2026, set a goal of 1.2 to 1.6 grams. Sports nutrition groups recommend more for people who train hard.
The disagreement is real, but it is less confusing than it looks. Each number answers a slightly different question, and the right one for you depends on your age, how active you are, and what you are trying to achieve. This article lays out where each figure comes from, who should aim for which range, and how to turn the advice into grams on your plate.
The Short Answer
For most healthy adults, 0.8 grams per kilogram of body weight per day is the minimum, and a sensible working range is roughly 1.0 to 1.6 grams. Lean toward the upper end if you are older, lifting weights, or losing weight and want to protect muscle. The table shows each recommendation and what it means for a 70-kilogram (154-pound) person.
| Who | Daily protein | For a 70 kg person |
|---|---|---|
| Healthy adult, minimum (RDA) | 0.8 g/kg | 56 g |
| Adults, 2025-2030 federal goal | 1.2 to 1.6 g/kg | 84 to 112 g |
| Healthy older adults (PROT-AGE panel) | at least 1.0 to 1.2 g/kg | 70 to 84 g |
| Physically active people (ISSN) | 1.4 to 2.0 g/kg | 98 to 140 g |
| Resistance-trained, not dieting (one review) | about 1.6 g/kg or more | 112 g or more |
These are grams of protein, not grams of food. A 100-gram chicken thigh contains far less than 100 grams of protein, so you will need to look up the protein in what you eat.
Why the Official Numbers Disagree
The Recommended Dietary Allowance (RDA) is defined as the intake that meets the needs of nearly all healthy people, 97 to 98 percent of them. It rests on nitrogen balance studies, and the adult value of 0.8 g/kg has been essentially unchanged for more than 70 years. Behind it sits an average requirement of 0.66 g/kg, and the RDA adds a margin so that almost everyone is covered.
The word “allowance” misleads people. The RDA is a floor that prevents deficiency, not a target that optimizes health or performance. Researchers who favor higher intakes make this point directly: the RDA is adequate to avoid obvious inadequacies, but many adults may benefit from more protein, better quality, and better distribution across the day.
The 2025-2030 guidelines took that argument into policy. They tell adults to prioritize protein foods at every meal, aiming for 1.2 to 1.6 grams per kilogram, up from the 0.8 grams that earlier federal messaging reflected. The change was not welcomed by everyone. The American Society for Nutrition pointed out that HHS drew on a report separate from the Dietary Guidelines Advisory Committee’s, a departure from past practice. A perspective in The Journal of Nutrition credited the emphasis on high-quality protein foods but argued that evidence from weight-loss studies is too narrow to justify one target for every American. Some experts add that most Americans already meet the older recommendation.
A fair reading of the evidence is this. Treat 0.8 g/kg as the level below which a healthy adult should not go. Treat 1.2 to 1.6 g/kg as a reasonable goal if you want to build or keep muscle, and not as a number that everyone must hit. Both sit well inside the National Academies’ acceptable range of 10 to 35 percent of calories from protein.
How to Calculate Your Own Number
- Convert your weight to kilograms. Divide pounds by 2.2. A 150-pound person weighs about 68 kg.
- Pick a range that fits your situation. Use the table above. If you are unsure, 1.0 to 1.2 g/kg is a defensible starting point for a healthy adult who is not training hard.
- Multiply. At 68 kg, 0.8 g/kg gives 54 grams, and 1.2 g/kg gives 82 grams.
- Check the calorie share. Multiply grams by 4 and divide by your daily calories. Eating 82 grams on 2,000 calories supplies 328 calories from protein, about 16 percent, comfortably within the 10 to 35 percent range.
The National Academies’ RDA table is based on a reference body weight. If your weight is far from typical, a registered dietitian can help you decide which weight to use. This is also true for children, pregnant people, and anyone with a medical condition, since the adult figures above do not cover them.
Protein After 50
Older adults are the group where the case for more protein is strongest. The PROT-AGE expert panel recommended that healthy older people average at least 1.0 to 1.2 grams per kilogram each day, and the same coverage reports that older people appear to need 25 to 30 grams at a meal to switch on muscle building, a higher threshold than in younger adults.
Falling short is common in this age group. An analysis of national survey data found that about one in three adults over 50 did not eat enough protein and that those with low intake were more likely to report physical limitations. The researchers came from The Ohio State University and Abbott, a nutrition company, and the study shows an association, not proof that low protein caused the limitations. It still fits a pattern: the average American adult has plenty of protein while some older adults, especially those who skip meals, do not.
If You Lift Weights or Train Hard
The International Society of Sports Nutrition takes a clear position. Its position stand recommends 1.4 to 2.0 grams per kilogram per day for physically active people, with the lower end for endurance exercise, the middle for intermittent sports such as soccer or basketball, and the upper end for strength and power work. The position stand I reviewed was published in 2007, and the Society has since issued an update that I could not open, so check it if you need the current wording.
A later review focused on muscle building found that about 1.6 g/kg per day was a reasonable minimum for resistance-trained people who are not dieting, with an upper level of 2.2 g/kg in the data it examined. The authors stress that 1.6 is not a hard ceiling and that individual needs vary. One of the authors disclosed a role on an advisory board for a supplement company, which is worth knowing even though the numbers match those from other groups.
For an 80 kilogram lifter, the range runs from 112 grams (1.4 g/kg) to 160 grams (2.0 g/kg). That is a lot of food, and not everyone needs to reach the top. The Society places endurance athletes at the lower end of its range and strength and power athletes at the upper end.
If You Are Losing Weight
Eating less food means eating less protein unless you plan for it, and losing weight without enough protein can cost you muscle along with fat. A systematic review of trials in adults older than 50 found that higher-protein diets during weight loss preserved more lean mass and led to more fat loss. The review covered 20 randomized trials, although the summary I could access did not report effect sizes.
This is the same type of evidence the Journal of Nutrition perspective calls too narrow to set a rule for everyone. It is a good reason to aim for the upper half of the 1.2 to 1.6 range during a calorie deficit, and it does not show that every adult needs that much all the time.
Spreading Protein Across the Day
Your body does not store amino acids the way it stores fat, and muscle protein synthesis rises after a meal and then settles. Researchers describe a period of net protein gain lasting roughly three to four hours after eating protein, followed by a fasted phase in which breakdown is relatively higher. That is the argument for not eating all your protein at dinner.
How much per meal is still debated. A common claim is that muscle building peaks at around 20 to 25 grams of high-quality protein, with the excess going to other uses. A review of the evidence found that this mainly applies to fast-digesting protein eaten alone and recommended a target of about 0.4 g/kg per meal across at least four meals. For a 70 kg person, that is 28 grams per meal. The authors also noted that larger doses are not simply wasted and that the acute measurements do not always match long-term muscle gains.
A practical takeaway follows. Build every meal around a real protein food, and do not worry about hitting an exact number at each sitting. Older adults, who may need 25 to 30 grams at a meal, are the group for whom this matters most.
What Counts as Good Protein
Protein is built from amino acids, and nine of them are considered indispensable because your body cannot make them. Protein quality scores such as PDCAAS and DIAAS rate foods by their amino acid profile and digestibility. Animal foods usually supply all nine in good proportion, while many plant foods run low in one or more. Varied plant sources can cover the gap, so a vegetarian or vegan diet can meet protein needs with planning.
Harvard’s Nutrition Source argues that the source of protein matters more than the amount, noting that swapping red and processed meat for beans, nuts, or soy is linked with lower heart disease risk. It also notes that the International Agency for Research on Cancer classifies processed meat as carcinogenic to humans. The 2025-2030 guidelines recommend a variety of animal and plant sources, including beans, lentils, nuts, seeds, and soy, as well as eggs, poultry, seafood, and meat.
Harvard lists these amounts, which show how portions translate into grams:
- Cooked lentils: about 18 g per cup
- Skinless chicken thigh: about 28 g per 4 ounces
- Grilled sockeye salmon: about 30 g per 4 ounces
- Dry-roasted almonds: about 6 g per ounce
Those four foods add up to 82 grams, enough for the 68 kg example above, before counting protein from dairy, grains, and vegetables. That is the useful insight in the numbers: for most people, hitting 1.2 g/kg does not require supplements, just a protein food at each meal and a snack that contributes.
Can You Eat Too Much Protein?
For healthy people, there is no strong evidence of harm at the intakes discussed here. A review in Nutrition & Metabolism found no solid evidence that intakes of at least 1.5 g/kg harm kidney function in people with normal kidneys, and it treated the rise in filtration rate with high protein as a normal adaptation. The International Society of Sports Nutrition reached a similar conclusion for healthy, active people eating a balanced diet. The same review also noted that long-term studies are still needed, and the evidence on kidney stones is mixed.
The picture changes with existing kidney disease. Protein restriction is a standard part of managing it, and the Society itself says people with mild renal insufficiency should monitor their intake closely. If you have kidney disease, diabetes or another chronic condition, ask your doctor or dietitian before raising protein, and do not rely on general guidance.
There is a smaller, practical risk for everyone else. Some experts warn that raising protein goals could increase intake of fat and calories, particularly if the extra protein comes from fatty meats. Keep fiber and plant foods in the mix as you raise protein.
The Bottom Line
You need at least 0.8 grams of protein per kilogram of body weight each day. Most healthy adults can reasonably aim for 1.0 to 1.6 grams, older adults and people losing weight should lean higher, and those who train hard can go up to 2.0 grams. Spread it across meals, mix animal and plant sources, and treat the numbers as ranges, not exact targets.
If you want a single number to start with, multiply your weight in kilograms by 1.2, then adjust after a few weeks based on how you feel, how you train and what your clinician says.