How much protein does a person need per day: standards based on weight, age, and activity level

For a healthy adult, the classic international reference intake is approximately 0.8-0.83 g of protein per kilogram of body weight per day. This translates to approximately 56-58 g of protein per day for a person weighing 70 kg, and approximately 64-66 g for a person weighing 80 kg. WHO/FAO/UNU define 0.83 g/kg as a safe level, calculated to cover the needs of almost all healthy adults; EFSA uses the same 0.83 g/kg as the European population reference intake. [1]

However, 0.8 g/kg is not a universally optimal figure for every person. Older adults, athletes, people on a calorie deficit, and those in certain post-illness conditions may require more protein. Furthermore, the current Dietary Guidelines for Americans 2025-2030, published in January 2026, suggest a significantly higher target for a generally healthy diet—1.2-1.6 g/kg per day, adjusted for a person's energy needs. [2]

This doesn't mean the previous figure of 0.8 g/kg has become "wrong." We're talking about different concepts: 0.8-0.83 g/kg is a reference level intended primarily to cover physiological needs, while 1.2-1.6 g/kg in the new American recommendations is used as a higher target nutritional range. For physically active individuals, the International Society of Sports Nutrition cites a range of 1.4-2.0 g/kg. [3]

In cases of chronic kidney disease, severe obesity, pregnancy, malnutrition, or serious illness, the simple "weight x ratio" formula may no longer be accurate. In such situations, it's best to determine protein intake based on the diagnosis and body composition.

How to calculate daily protein intake based on weight

The simplest formula:

Body weight in kilograms x protein in grams per kilogram = grams of protein per day.

For example, with a body weight of 75 kg:

• 75 × 0.83 = about 62 g/day;
• 75 × 1.2 = 90 g/day;
• 75 × 1.6 = 120 g/day.

WHO/FAO/UNU calculates the requirement for healthy adults based on a safe level of 0.83 g/kg, while the American Recommended Dietary Allowance is traditionally 0.8 g/kg. [4]

How much protein is obtained at different weights?

Weight	0.83 g/kg	1.2 g/kg	1.6 g/kg
50 kg	42 g	60 g	80 g
60 kg	50 g	72 g	96 g
70 kg	58 g	84 g	112 g
80 kg	66 g	96 g	128 g
90 kg	75 g	108 g	144 g
100 kg	83 g	120 g	160 g

This table shows how strongly the result depends on the selected coefficient. Therefore, the question "How much protein does a person weighing 80 kg need?" doesn't have a single, universal figure without specifying the goal, age, activity level, and health status.

Why do some recommendations say 0.8 g/kg, while others say 1.6 g/kg?

Because these numbers often answer different questions.

WHO/FAO/UNU defined a safe level of 0.83 g/kg, which covers the physiological needs of approximately 97.5% of the healthy adult population. EFSA uses the same figure for adults in Europe. This does not mean "the ideal amount for maximum muscle preservation during exercise" – it is primarily a reference requirement. [5]

The American Dietary Reference Intakes system traditionally uses a Recommended Dietary Allowance of 0.8 g/kg per day. However, protein has a wide Acceptable Macronutrient Distribution Range (AMR) of 10-35% of the total energy value of the diet. Therefore, it is entirely possible to consume significantly more than 0.8 g/kg and still remain within the officially acceptable macronutrient range. [6]

In January 2026, the new Dietary Guidelines for Americans 2025-2030 were published. They explicitly specify a target range of 1.2-1.6 grams of protein per kilogram of body weight per day, and recommend including protein foods in every meal. This is a significant change in American public nutrition policy. [7]

Therefore, for an international audience, it's incorrect to simply write "the recommended protein intake is 1.5 g/kg" or, conversely, "anything above 0.8 g/kg is unnecessary." It's more accurate to distinguish between the reference intake and the higher target range for specific goals and population groups.

Is 0.8 g/kg the minimum acceptable amount?

Not really.

The Recommended Dietary Allowance and Population Reference Intake are deliberately set above the average physiological requirement to cover the needs of the vast majority of healthy people.

WHO/FAO/UNU estimate the average adult requirement to be approximately 0.66 g/kg, after which, taking into account interindividual variability, they obtain a safe level of approximately 0.83 g/kg. [8]

Therefore, the popular formulation “0.8 g/kg is the absolute minimum, below which the body will immediately begin to break down muscle” is too simplistic.

On the other hand, a person may technically get enough protein to prevent deficiency, but that amount may not be optimal for maintaining muscle mass in old age, during intense training, or during weight loss.

How much protein does the average adult need?

For a healthy adult without special athletic or medical goals, it is reasonable to consider 0.8-0.83 g/kg as a basic reference requirement rather than an upper limit.

EFSA sets 0.83 g/kg for adults, including the elderly, in its common reference value system. WHO/FAO/UNU use almost the same figure. [9]

The new US 2025-2030 guidelines propose a much higher overall target range of 1.2-1.6 g/kg. Therefore, there is now real variability between major international guidelines. [10]

A person weighing 70 kg can practically see three numbers at once:

• about 56-58 g is the traditional reference requirement;
• about 84 g - 1.2 g/kg;
• about 112 g - 1.6 g/kg.

None of them, by themselves, defines a “healthy diet” without context.

Do men need more protein than women?

Not necessarily per kilogram of body weight.

For typical adults, the WHO, EFSA, and North American Dietary Reference Intakes do not set fundamentally different g/kg values based solely on gender. Differences in absolute amounts often arise because men have higher average body mass and lean body mass.

For example, if both a man and a woman weigh 65 kg, calculating at 0.83 g/kg will give both of them approximately 54 g of protein per day.

Other circumstances—pregnancy, lactation, training intensity, age, and body composition—can alter needs much more than gender itself.

How much protein do you need after age 65?

Older adults are often recommended to eat more protein than younger adults.

The European Society for Clinical Nutrition and Metabolism (ESPEN) guidelines recommend a minimum of 1.0 g/kg per day for older adults, with individual adjustments based on nutritional status, physical activity, medical conditions, and tolerance. For healthy older adults, a range of 1.0–1.2 g/kg is often considered. [11]

In acute or chronic illness, the need may increase. ESPEN indicates that for elderly patients, expert groups have suggested a range of approximately 1.2–1.5 g/kg, although the exact amount depends on the disease and clinical condition. [12]

The reason is age-related muscle loss and a less pronounced anabolic response to a standard protein intake. Protein is especially effective for maintaining muscle function when combined with physical activity, especially strength training.

A meta-analysis of studies in healthy adults showed an additional benefit of higher protein intake on lean mass during resistance training; in participants ≥65 years, a significant effect was observed in studies with intakes of approximately 1.2–1.59 g/kg.[13]

How much protein do you need when exercising?

A healthy person who exercises regularly typically requires more than the baseline 0.8 g/kg.

The International Society of Sports Nutrition position recommends approximately 1.4–2.0 g/kg protein per day for most physically active individuals wishing to maintain or increase muscle mass.[14]

For example, for a person weighing 80 kg:

• 1.4 g/kg = 112 g;
• 1.6 g/kg = 128 g;
• 2.0 g/kg = 160 g.

This does not mean that 160g is automatically better than 120g.

A large meta-analysis of 49 strength training studies found that increasing total protein intake above approximately 1.6 g/kg per day, on average, no longer resulted in further increases in lean mass gains. This finding applies to the healthy adult population studied and does not establish a rigid physiological "ceiling" for each athlete. [15]

How much protein do you need to build muscle?

For muscle growth, two factors are important at once:

Strength training + adequate nutrition.

Increasing protein intake alone without a training stimulus does not lead to comparable muscle growth.

For most people who regularly engage in strength training, a range of approximately 1.4–1.6 g/kg already meets much of the evidence, and sport guidelines suggest increasing this to 2.0 g/kg.[16]

For a person weighing 70 kg this corresponds approximately to:

• 98 g at 1.4 g/kg;
• 112 g at 1.6 g/kg;
• 140 g at 2.0 g/kg.

Whether you need to aim for the upper limit depends on your training volume, total calorie intake, body composition, and goals.

Do you need more protein when losing weight?

Often yes - mainly to reduce muscle loss during a calorie deficit.

When losing weight, the body loses more than just fat. Some of the weight loss may come from lean tissue, especially if there's a significant energy deficit and no strength training.

A meta-analysis of 47 studies with 3,218 overweight or obese participants found that higher protein intake reduced muscle loss during weight loss. In this analysis, intakes above approximately 1.3 g/kg were associated with greater muscle mass preservation, while intakes below 1.0 g/kg were associated with greater muscle mass loss. [17]

Therefore, a range of approximately 1.2-1.6 g/kg is often used as a practical guideline for weight loss in healthy adults, especially when combined with strength training. However, with significant obesity, the problem arises of choosing the weight by which to multiply the coefficient.

How to count protein if you're obese

Simply multiplying the actual 120-150 kg by a high coefficient is not always correct.

Protein requirements are more strongly related to metabolically active and lean mass than to fat mass. Research shows that relying solely on actual weight in severe obesity can differ significantly from relying on lean mass. [18]

In clinical nutrition, adjusted body weight is sometimes used. For example, ESPEN uses adjusted body weight instead of actual weight for certain clinical situations in people with obesity. [19]

This is especially important if a person wants to calculate, for example:

150 kg x 1.6 = 240 g protein daily.

From body weight alone it cannot be concluded that he actually needs 240 g.

In cases of severe obesity, especially in the context of diabetes, kidney disease, or when using medication-assisted weight loss, a personalized calculation by a nutritionist will be more accurate.

Protein when taking weight loss drugs

A significant decrease in appetite can lead to a risk of not only calorie deficiency but also protein deficiency. This is especially true during therapy with glucagon-like peptide-1 receptor agonists.

A 2026 review of nutritional guidelines for GLP-1 therapy suggests that appropriate adults without chronic kidney disease should aim for at least 1.2 g/kg, sometimes increasing to 1.6 g/kg, while also incorporating strength training to preserve muscle tissue. The authors emphasize that recommendations should be tailored to body composition and medical condition. [20]

This is not yet a universal international standard for all users of GLP-1 drugs, but rather a developing area of clinical nutrition.

How to distribute protein throughout the day

For most healthy people, the first priority is to get an adequate total daily intake.

Physically active people may find it helpful to spread it over several meals rather than eating almost all of their daily protein at dinner.

The ISSN position on sports nutrition considers approximately 20-40 g of quality protein per meal, or about 0.25-0.40 g/kg, spaced approximately every three to four hours, as a practical way to support muscle synthesis in training individuals.[21]

For example, the goal of 100 g per day can be achieved not by one huge intake, but conditionally:

• 25 g at breakfast;
• 30 g at lunch;
• 15-20 g as a snack;
• 30 g at dinner.

The average person does not need to strictly count the minutes between meals.

Is there a limit to how much protein can be absorbed in one sitting?

The common belief that the body can only “absorb 20-30g of protein at a time” is incorrect.

The digestive system can absorb even larger amounts of protein. However, the stimulation of muscle protein synthesis after a single intake is dose-dependent and does not increase indefinitely in proportion to the amount consumed.

This is why sports recommendations suggest approximately 20-40g per serving to optimize muscle response, rather than stating that any protein beyond this amount “will not be absorbed.” [22]

Excess amino acids can be used for other processes or oxidized as an energy source.

How much protein do pregnant women need?

The need increases as pregnancy progresses.

EFSA recommends adding to a woman's normal requirement:

• approximately +1 g/day in the first trimester;
• +9 g/day in the second;
• +28 g/day in the third. [23]

These are additional grams to the base requirement, not the final total amount.

When breastfeeding, EFSA recommends an additional 19 g per day in the first six months and 13 g per day after the first six months of lactation. [24]

During pregnancy, there's no need to switch to a very high-protein diet just because "the baby needs protein." The diet should remain balanced in energy, fiber, fat, vitamins, and minerals.

How much protein do children need?

For children, the requirement per kilogram is usually higher than for adults, since protein is needed not only for tissue maintenance but also for growth.

EFSA sets age-specific population reference intakes of approximately 1.31 g/kg in early childhood, gradually decreasing to 0.83 g/kg by the end of adolescence.[25]

Therefore, the adult coefficient of 0.8 g/kg cannot be mechanically applied to a small child.

On the other hand, children should also not be given sports protein powders or a high-protein diet just to promote growth without medical indications.

What to do if you have kidney disease

Here the recommendations may be the opposite of sports advice.

KDIGO 2024 recommends that adults with chronic kidney disease stages G3-G5 not on dialysis maintain an intake of approximately 0.8 g/kg per day. It also advises avoiding high intakes above 1.3 g/kg if there is a risk of kidney disease progression. [26]

The reason is that protein metabolism products are excreted by the kidneys, and high protein intake increases the renal filtration load. For a patient with already reduced kidney function, the recommendations differ from those for a healthy athlete.

Very low-protein diets exist for some stages of chronic kidney disease, but KDIGO considers them only as specialized treatment under professional supervision. Reducing protein to 0.3-0.6 g/kg on your own is dangerous due to the risk of malnutrition. [27]

In contrast, patients on dialysis may have higher requirements due to amino acid losses and metabolic peculiarities. Therefore, the advice to "eat less protein when you have kidney disease" also cannot be applied equally to all stages.

Is high protein harmful to healthy kidneys?

A healthy person should not have to endure the restrictions intended for chronic kidney disease.

In the sports literature, intakes of 1.4–2.0 g/kg are considered acceptable for healthy, physically active individuals.[28]

However, this does not mean that “the more, the safer.” EFSA has not yet established a Tolerable Upper Intake Level for protein, as there is insufficient data to determine a specific upper limit that would be universally safe for all population groups. [29]

The lack of an official UL simply means there is insufficient data to support a single, universal number - not proof that any quantity is safe.

Therefore, consuming 3-4 g/kg daily without a specific sporting or medical reason cannot be justified by the argument that “there is no upper limit.”

Should you eat only animal protein?

No.

Protein can be obtained from:

• meat;
• fish and seafood;
• eggs;
• dairy products;
• legumes;
• soybeans;
• tofu and tempeh;
• nuts and seeds;
• whole grain products.

The British Dietetic Association points out that the requirement can be successfully met by plant foods - lentils, beans, chickpeas, soya, tofu, tempeh, nuts and seeds. [30]

The 2025 position statement of the Academy of Nutrition and Dietetics concludes that properly planned vegetarian and vegan diets for adults can be nutritionally complete.[31]

Differences in the amino acid composition and digestibility of individual proteins exist, but with a varied diet, it is not necessary to strictly combine specific plant proteins in one plate. A variety of sources allows you to obtain the necessary essential amino acids throughout the day. [32]

What is a "complete protein"?

Protein is made up of amino acids. The body can synthesize some of these on its own, while essential amino acids must be obtained from food.

Different foods contain them in different proportions and differ in digestibility. Therefore, when assessing protein, it's not just the number of grams that matters, but also the quality of the entire diet.

WHO/FAO/UNU separately establish the needs of adults for essential amino acids - leucine, lysine, valine, tryptophan and others. [33]

In a normal, varied, mixed diet, a person rarely needs to count each amino acid separately.

How much protein is contained in common foods?

It is important not to confuse the weight of a product and the amount of protein.

100 grams of chicken is not 100 grams of protein. Most of the weight is made up of water and other components.

Approximate values vary greatly depending on the type of product, fat content and cooking method, but as a guide:

Product	Approximate amount of protein
1 large egg	about 6 g
100 g cooked chicken breast	about 30 g
100 g cooked fish	usually about 20-25 g
200 g Greek yogurt	approximately 18-20 g
250 ml of milk	about 8 g
100 g cooked lentils	about 9 g
100 g tofu	approximately 8-17 g, depending on the product
30 g of nuts	about 5-7 g

The nutritional content of individual foods varies, so for precise calculations, it's best to use the product label or a food composition database. USDA FoodData Central is one of the largest government databases of such data and is updated regularly. [34]

What 90-100g of protein might look like in a typical meal

This amount doesn't necessarily mean several large steaks or daily protein powder.

For example, per day protein can come from:

• eggs and dairy products for breakfast;
• meat, fish, tofu or beans for lunch;
• yogurt, cottage cheese or soy product as a snack;
• fish, poultry, lentils or beans for dinner;
• small quantities from bread, cereals, vegetables, nuts and other products.

Protein doesn't just come from what's commonly referred to as "protein foods." Cereals, bread, and vegetables also contribute to your daily intake.

The USDA's current 2025-2030 US guidelines also consider both animal and plant sources: eggs, poultry, fish, meat, legumes, nuts, seeds, and soy. [35]

Do you need protein powder?

For most people, no, as long as they get enough protein from regular food.

Whey, casein, soy, or other protein is primarily a convenient, concentrated source of dietary protein, not a required sports supplement.

ISSN notes that a physically active person is able to fully meet their protein needs with regular food; supplements are convenient mainly because they allow you to easily increase your protein intake without eating a large amount of food. [36]

The powder can be practical, for example:

• after training, if it is not possible to eat normally;
• with poor appetite;
• with a high protein goal;
• if your regular diet constantly doesn't provide enough protein.

But 25g of protein from powder does not have a magical property that a complete protein food cannot provide in principle.

Is it necessary to drink protein immediately after a workout?

There is no need to fit into a narrow “anabolic window” of a few minutes.

Total daily protein intake remains the key factor. Protein consumed before or after strength training can stimulate muscle protein synthesis, and the anabolic effect of exercise lasts significantly longer than immediately after the workout. [37]

A practical strategy for an athlete is to get a full serving of protein in the hours surrounding a workout, without turning nutrition into a stopwatch.

Can more protein help you lose weight faster?

Protein can help control dietary intake by promoting satiety and preserving muscle tissue, but it does not, by itself, eliminate energy balance.

If a high-protein diet simultaneously contains more calories than the body uses, increasing protein does not guarantee weight loss.

The main benefit of increased protein intake during a calorie deficit is related to the preservation of lean mass rather than to fat burning itself. A 2024 meta-analysis confirms greater muscle mass preservation with increased protein intake in overweight and obese individuals undergoing weight loss programs. [38]

Do you need to count protein every day?

For most people, keeping accurate counts on a regular basis is not necessary.

It is especially useful if:

• a person trains with the aim of gaining muscle mass;
• is in a severe calorie deficit;
• loses muscle mass;
• is elderly and poorly nourished;
• follows a very restrictive diet;
• has a medical condition in which the protein is specifically regulated.

A practical way is to calculate your usual diet over several typical days and get a rough idea of the average.

If you're consistently on target, weighing each food item daily usually doesn't provide any additional benefit.

What is often misunderstood

"Every person needs exactly 1 gram of protein per kilogram."

No. Requirements vary based on age, physical activity, energy balance, and health status. International reference values for the average adult are around 0.8–0.83 g/kg, while new US recommendations use a target range of 1.2–1.6 g/kg. [39]

"0.8 g/kg is dangerously low"

No. This figure is calculated specifically as a level that covers the needs of the vast majority of healthy adults. It may simply be lower than the optimal amount for some purposes. [40]

"The more protein, the faster your muscles grow."

No. A meta-analysis of resistance training found a significant saturation of effect around a total intake of 1.6 g/kg/day; further increases, on average, did not result in additional gains in lean mass.[41]

"Only 30g is absorbed at a time"

No. The limitation does not concern digestive absorption itself, but the magnitude of the maximum acute stimulation of muscle protein synthesis. [42]

"For protein, you definitely need meat."

No. A properly planned plant-based diet can meet the protein needs of adults. [43]

"High amounts of protein are safe for absolutely everyone."

No. In chronic kidney disease, recommendations may require restrictions, and KDIGO advises patients with CKD G3-G5 to avoid intakes >1.3 g/kg if at risk of progression. [44]

Practical algorithm: which number to choose

For a person without serious illnesses, one can be guided by the following logic.

If physical activity is low and the goal is simply to cover physiological needs: about 0.8-0.83 g/kg corresponds to traditional international references. [45]

If you want a higher total protein diet to preserve muscle and feel satiated: The range of 1.2-1.6 g/kg is consistent with the current US Dietary Guidelines 2025-2030. [46]

If a person exercises regularly: approximately 1.4-2.0 g/kg is within the ISSN range for healthy physically active people.[47]

After 65 years: The ESPEN guideline starts at a minimum of 1.0 g/kg, and for healthy older adults, around 1.0-1.2 g/kg is often considered. [48]

For weight loss: Increasing protein to approximately the 1.2-1.6 g/kg range may help preserve muscle tissue, especially in conjunction with strength training; for obesity, choosing body weight for calculation requires caution. [49]

For chronic kidney disease: Do not use sports ranges on your own; KDIGO for CKD G3-G5 is usually around 0.8 g/kg. [50]

Key points from experts

Dorothee Volkert is a researcher at the Institute for Biomedicine of Aging, Friedrich-Alexander-Universität Erlangen-Nürnberg; she is the first author of the ESPEN guidelines on nutrition for older adults. Her membership in the research group on biomedicine of aging and her leading role in the ESPEN guidelines are confirmed by the society's publications. [51]

In the ESPEN recommendations, the Volkert group points out that for the elderly, the standard 0.8 g/kg may not be a sufficient practical guideline: at least 1 g/kg should be provided, and in healthy elderly people, 1.0-1.2 g/kg is often considered with further individual adjustment. [52]

Stuart M. Phillips, PhD - Distinguished University Professor McMaster University, Professor of Kinesiology, Tier 1 Canada Research Chair in Skeletal Muscle Health in Aging, and researcher on the effects of nutrition and exercise on muscle protein metabolism. [53]

In a meta-analysis conducted by a group including Phillips, protein supplementation enhanced resistance training adaptations, but further gains in lean mass ceased to increase on average after a total intake of approximately 1.6 g/kg per day. This nicely illustrates the principle that more protein does not mean infinitely greater muscle gains.[54]

Frequently Asked Questions

How much protein does a 60 kg person need?

The international reference intake of 0.83 g/kg yields approximately 50 g per day. With a target range of 1.2-1.6 g/kg, this yields approximately 72-96 g.

How much protein do you need if you weigh 70 kg?

About 58 g according to the EFSA/WHO reference; approximately 84-112 g with a range of 1.2-1.6 g/kg.

How much protein do you need if you weigh 80 kg?

About 66 g at 0.83 g/kg; 96 g at 1.2 g/kg and 128 g at 1.6 g/kg.

Is 100g of protein per day enough?

It depends on your weight and goals. For a 70 kg person, it's about 1.43 g/kg, while for a 100 kg person, it's 1 g/kg. The same figure represents different levels of consumption.

Should you eat protein for breakfast?

It doesn't have to be in the morning, but spreading it out evenly throughout the day can be convenient, especially for older people and those who exercise.

Is it possible to get 150g of protein from food alone?

Yes. Protein powder is not essential. However, if your target amount is high, a supplement can make your diet easier.

Is it possible to eat 2g of protein per kilogram?

For a healthy, regularly exercising individual, 2.0 g/kg is within the ISSN sports nutrition recommendations range. However, this is not a universal recommendation for people with kidney disease or other medical limitations. [55]

Is there a maximum protein intake?

EFSA has not established an official tolerable upper intake level for protein due to insufficient data. This does not mean that any amount is equally beneficial or safe. [56]

Do you need more protein after 60-65 years?

Often yes. ESPEN recommends a minimum of about 1 g/kg for older adults, typically considering 1.0-1.2 g/kg in healthy older adults.[57]

Does protein help maintain muscle mass when losing weight?

Yes, higher intakes in weight loss programs are associated with better muscle mass retention, especially when combined with resistance training.[58]

Which is better - animal or plant protein?

Both can be part of a complete diet. For a plant-based diet, adequate total calories and a variety of sources are especially important – legumes, soy, nuts, seeds, and grains. [59]

Main

For a healthy adult, 0.8–0.83 g of protein per kilogram of body weight per day remains the international reference level, calculated to cover the physiological needs of most people. For a person weighing 70 kg, this is approximately 56–58 g of protein. [60]

However, the modern understanding of protein nutrition is broader than a single number. The current US Dietary Guidelines 2025-2030 recommend a target range of 1.2-1.6 g/kg, ESPEN recommends at least 1 g/kg for older adults, and sports recommendations for healthy individuals who exercise regularly use approximately 1.4-2.0 g/kg.

Therefore, the most reasonable question is not simply “what is the protein requirement?” but “how much protein does a person of my weight, age, activity level, and health status need?” In cases of chronic kidney disease, severe obesity, or serious illness, calculating based solely on actual body weight may be incorrect. [61]