How Much Protein Do You Need a Day? Protein Needs by Age, Weight and Activity Level

Protein has become one of the most talked-about nutrients in health and fitness.

Supermarkets are filled with high-protein yoghurts, shakes, bars, cereals and snacks. Social media posts sometimes suggest that almost everyone should dramatically increase their protein intake.

But how much protein do you actually need each day?

The answer depends on more than whether you exercise.

Your body weight, age, activity level, health, pregnancy status and goals can all influence your protein needs. And while getting enough protein is important, consuming increasingly large amounts does not automatically produce better health or bigger muscles.

This guide explains how protein requirements are estimated, how to calculate a basic daily target and how to get enough from ordinary foods.

What Is Protein?

Protein is one of the three major macronutrients, alongside carbohydrate and fat.

Proteins are made from smaller compounds called amino acids.

Your body uses amino acids to build and maintain tissues and to produce many important substances.

Protein contributes to:

• maintaining and repairing muscle;
• skin and other tissues;
• enzymes;
• hormones;
• antibodies and immune functions; and
• numerous processes throughout the body.

Because your body continually turns over proteins, you need an adequate supply from your diet.

How Much Protein Does an Average Adult Need?

A widely used baseline recommendation for healthy adults is approximately:

0.8 grams of protein per kilogram of body weight per day.

This represents a general reference intake rather than the perfect target for every individual.

For example:

Body weight	0.8 g/kg protein
50 kg	40 g/day
60 kg	48 g/day
70 kg	56 g/day
80 kg	64 g/day
90 kg	72 g/day
100 kg	80 g/day

The calculation is straightforward:

Body weight in kilograms × 0.8 = grams of protein per day

For someone weighing 75 kg:

75 × 0.8 = 60 grams

That gives a useful basic reference point.

It does not mean 60 grams is necessarily the optimal amount for every 75 kg person.

Why Doesn't Everyone Need the Same Amount?

Two people who weigh exactly the same can have different protein needs.

Important factors include:

• age;
• physical activity;
• muscle mass;
• pregnancy;
• illness or recovery;
• calorie intake;
• strength-training goals; and
• certain medical conditions.

This is why claims such as “everyone needs 150 grams of protein every day” are misleading.

How Much Protein Do You Need Based on Activity?

The basic 0.8 g/kg reference is useful for generally healthy, relatively sedentary adults.

People who exercise regularly may benefit from higher intakes.

A practical way to think about protein requirements is:

Generally sedentary healthy adult: around 0.8 g/kg/day

Regularly active adult: needs may be higher depending on the amount and type of exercise.

Regular resistance or endurance training: sports-nutrition recommendations commonly fall around 1.2–2.0 g/kg/day, depending on training and circumstances.

The upper end of that range should not be interpreted as a target that everyone needs to reach.

Protein Calculator Examples

Consider a person weighing 70 kg.

At 0.8 g/kg:

70 × 0.8 = 56 g/day

At 1.2 g/kg:

70 × 1.2 = 84 g/day

At 1.6 g/kg:

70 × 1.6 = 112 g/day

At 2.0 g/kg:

70 × 2.0 = 140 g/day

That demonstrates why someone's activity and circumstances can dramatically change a calculated protein target.

How Much Protein Do You Need to Build Muscle?

Resistance training provides the stimulus that tells muscles to adapt.

Protein supplies amino acids needed to support that process.

Simply consuming large amounts of protein while remaining inactive does not produce the same effect as resistance training.

For people performing regular resistance exercise, protein intakes above the basic adult reference level may help support muscle growth and recovery.

However, there appears to be a point beyond which simply adding more protein produces progressively smaller benefits.

More protein is not automatically more muscle.

Training quality, total energy intake, recovery, sleep and consistency also matter.

Is 100 Grams of Protein a Day Enough?

It depends on the person.

For a 60 kg adult, 100 grams represents approximately:

1.67 g/kg/day

For a 100 kg adult, the same 100 grams represents:

1.0 g/kg/day

So asking whether 100 grams is “high” or “low” without considering body size can be misleading.

This is why protein recommendations are often expressed relative to body weight.

How Much Protein Do Older Adults Need?

Protein becomes particularly important as people age because ageing is associated with gradual loss of muscle mass and strength.

European clinical nutrition guidance recommends that older adults generally consume at least 1.0 g/kg/day, adjusted according to nutritional status, physical activity, illness and individual tolerance.

For healthy older adults, expert groups have commonly suggested approximately:

1.0–1.2 g/kg/day

Some people who are ill, malnourished or recovering may require more—but those circumstances need individualised nutritional guidance.

Maintaining muscle in later life is not only about appearance.

Muscle supports:

• mobility;
• balance;
• independence;
• strength;
• physical function; and
• healthy ageing.

A 2026 systematic review also highlighted the importance of adequate dietary protein for preserving muscle mass and function among older adults, while noting that evidence becomes more complicated when multiple long-term health conditions are present.

Protein and Strength Training as You Age

Protein works best as part of a bigger strategy.

Resistance exercise is particularly important for maintaining strength and muscle.

Examples include:

• weight machines;
• resistance bands;
• free weights;
• appropriately modified body-weight exercises; and
• other forms of progressive resistance training.

Recent systematic-review evidence continues to support resistance training for improving strength and physical function in older adults with sarcopenia.

How Much Protein Do Women Need?

Women do not have one universal protein requirement.

Needs depend on body size, age, activity and health rather than sex alone.

For example, a sedentary 55 kg woman and an athletic 80 kg woman should not automatically receive the same protein target.

Protein becomes particularly relevant during midlife because maintaining muscle is important as body composition changes with ageing and menopause.

Related reading: Perimenopause Belly Fat: Why It Happens and What Actually Helps

Does Protein Help During Perimenopause and Menopause?

Adequate protein can help support muscle maintenance, particularly when combined with resistance exercise.

But protein is not a treatment that selectively burns menopause belly fat.

During the menopausal transition, the goal should be broader:

• preserve muscle;
• maintain strength;
• support bone health;
• stay physically active; and
• maintain a nutritionally balanced diet.

Protein is one part of that strategy.

How Much Protein Do Men Need?

The same principle applies to men.

Protein requirements depend strongly on body size and activity.

A larger, highly active man may require substantially more total protein than a smaller sedentary man.

But being male does not automatically mean someone needs enormous quantities of protein powder or multiple high-protein products every day.

How Much Protein Do You Need for Weight Loss?

Protein can be particularly useful during weight loss because maintaining lean tissue is important when body weight decreases.

When people lose substantial weight, they do not necessarily lose body fat alone.

Some lean mass can also be lost.

Adequate protein combined with resistance exercise can help support muscle preservation.

This is particularly relevant for people experiencing significant appetite reduction during medical weight-management treatment.

Related reading: GLP-1 Diet: What to Eat, What to Avoid and How to Get Enough Protein and Fibre

Our upcoming article GLP-1 and Muscle Loss will examine this issue more closely.

Does Eating More Protein Make You Lose Weight?

Protein isn't a fat-burning substance.

A higher-protein diet may help some people with fullness and muscle preservation, but weight loss ultimately involves the broader balance between energy intake, energy expenditure and numerous behavioural and biological factors.

Adding protein shakes and bars on top of everything you already eat does not guarantee weight loss.

They still contribute energy.

Should You Eat Protein at Every Meal?

You do not need to obsessively calculate every bite.

However, spreading protein-containing foods across the day can be a practical way to reach your needs.

For example:

Breakfast: eggs or yoghurt.

Lunch: beans, lentils, tuna, chicken or tofu.

Dinner: fish, lean meat, beans, tofu or another protein source.

Snack when needed: yoghurt, milk, nuts or another nutritious protein-containing food.

This may be easier than trying to consume almost your entire day's protein at dinner.

What Foods Are High in Protein?

You can obtain protein from both animal and plant foods.

Animal Protein Sources

Examples include:

• fish;
• eggs;
• chicken;
• turkey;
• lean meat;
• milk;
• yoghurt;
• cottage cheese; and
• other dairy products.

Plant Protein Sources

Examples include:

• lentils;
• beans;
• chickpeas;
• tofu;
• tempeh;
• edamame;
• peas;
• nuts;
• seeds; and
• certain whole grains.

People following vegetarian or vegan diets can meet their protein requirements without meat.

Variety becomes particularly useful because plant foods provide different combinations of amino acids and other nutrients.

Do You Need Protein Powder?

No.

Protein powder is optional, not essential.

Most people can obtain protein through ordinary foods.

Protein powders can be convenient for people who:

• struggle to meet requirements through food;
• have very high training demands;
• have reduced appetite;
• need a convenient post-training option; or
• have another reason for supplementation.

But a protein shake isn't automatically healthier than a balanced meal.

Whole foods can also provide fibre, vitamins, minerals and other beneficial nutrients.

What About Protein Bars?

The words “high protein” on a package do not automatically make a food healthy.

Protein bars vary considerably.

Some contain substantial amounts of:

• added sugar;
• saturated fat;
• calories;
• sugar alcohols; and
• highly processed ingredients.

They can be convenient, but they do not need to become the foundation of your diet.

Can You Eat Too Much Protein?

Yes, more is not necessarily better.

Very high-protein diets can crowd out other nutritious foods if they leave little room for:

• vegetables;
• fruits;
• whole grains;
• healthy fats; and
• fibre-rich foods.

Extremely high intake also isn't necessary for most people.

People with certain medical conditions require particular caution.

What About Protein and Kidney Health?

This deserves careful treatment because internet advice is often too simplistic.

For generally healthy people, ordinary recommended protein intake should not be confused with kidney disease treatment.

However, people with chronic kidney disease or significantly impaired kidney function may need individualised protein targets depending on disease stage, nutritional status and treatment.

Some people with kidney disease may be advised to restrict protein, while circumstances such as dialysis can change requirements considerably.

European clinical nutrition guidance specifically emphasises adjusting protein intake according to kidney function in medically complex patients.

Therefore:

Do not start an extremely high-protein diet because of something you saw online if you have kidney disease or impaired kidney function.

Speak with your doctor or a qualified renal dietitian about an appropriate target.

Does Protein Damage Healthy Kidneys?

Statements such as “protein destroys your kidneys” are too broad.

Protein recommendations for healthy people and protein management in established kidney disease are different questions.

The important point is not to assume that a very high intake is beneficial simply because moderate protein is necessary.

Individual health status matters.

Can Protein Make You Constipated?

Protein itself isn't necessarily the direct problem.

But some high-protein eating patterns replace fibre-rich foods with large quantities of meat, shakes or processed protein products.

If vegetables, fruits, beans and whole grains disappear from the diet, fibre intake may become inadequate.

Hydration matters too.

A balanced diet should not become:

protein + protein + protein.

Fibre, micronutrients and healthy fats remain important.

Is Animal Protein Better Than Plant Protein?

Animal proteins generally contain all essential amino acids in proportions that make them highly usable by the body.

But that does not mean plant proteins are inadequate.

A varied diet containing beans, lentils, soy foods, nuts, seeds and grains can provide sufficient protein.

Plant-protein foods can also provide valuable fibre and other nutrients.

The overall dietary pattern matters more than declaring one entire category “good” and another “bad.”

How Much Protein Is in Common Foods?

Exact amounts vary by product, serving size and preparation, but approximate examples can help.

A typical serving of cooked chicken breast can provide around 25–30+ grams.

A serving of fish may provide approximately 20–30 grams.

Two large eggs provide roughly 12–13 grams.

A typical high-protein Greek-style yoghurt may provide around 15–20 grams, depending on the product and portion.

A cup of cooked lentils provides roughly 17–18 grams.

A cup of cooked beans can provide roughly 14–16 grams, depending on the variety.

Always check nutrition information when you need precise amounts because serving sizes vary considerably.

A Simple High-Protein Day Without Protein Powder

Someone aiming for approximately 80–100 grams might potentially obtain it through ordinary meals.

For example:

Breakfast: eggs plus yoghurt.

Lunch: lentil or chicken salad.

Snack: yoghurt or milk with nuts.

Dinner: fish, tofu, beans or poultry with vegetables and whole grains.

This is only an illustration.

Your appropriate total could be lower or higher.

Is Protein More Important Than Calories?

They answer different nutritional questions.

Protein helps provide amino acids.

Calories represent energy.

Someone can consume plenty of protein while still eating too much or too little total energy.

Likewise, someone can consume enough calories but insufficient protein or micronutrients.

A healthy diet has to consider the whole nutritional picture.

Frequently Asked Questions

How much protein should I eat a day?

For a generally healthy adult, approximately 0.8 g/kg of body weight per day is a widely used baseline reference. Individual needs can be higher depending on age, exercise and other circumstances.

How do I calculate my protein needs?

Multiply your body weight in kilograms by the appropriate grams-per-kilogram target.

For the basic 0.8 g/kg reference:

Body weight × 0.8 = grams per day

Is 100g of protein a day too much?

Not necessarily. Whether 100 grams is high, low or appropriate depends partly on your body size, activity and health.

Is 50g of protein enough?

It may be sufficient for some smaller sedentary adults but inadequate for larger, highly active or older people. Calculate requirements relative to body weight rather than relying on one number for everybody.

Do I need more protein after 50?

Maintaining adequate protein becomes increasingly important with ageing. Guidance for older adults commonly recommends at least around 1.0 g/kg/day, with individual adjustment.

How much protein should I eat to gain muscle?

People performing regular resistance training commonly need more than the basic sedentary adult reference. Sports-nutrition recommendations often fall within approximately 1.2–2.0 g/kg/day, depending on circumstances.

Can I get enough protein without meat?

Yes. Beans, lentils, chickpeas, soy foods, nuts, seeds and other plant foods can contribute significantly to protein intake.

Do eggs count as protein?

Yes. Eggs provide high-quality protein along with other nutrients.

Do I need protein immediately after exercise?

You do not need to panic if you cannot consume protein within minutes of finishing a workout. Your overall daily protein intake and regular distribution across meals are more important than treating a tiny post-exercise window as an emergency.

Is more protein always better?

No. Once your needs are adequately met, continually increasing intake does not automatically provide additional benefit.

The Bottom Line

There is no universal number of grams of protein that everybody should eat.

For generally healthy adults, around 0.8 grams per kilogram of body weight per day provides a useful baseline reference.

But requirements can increase with age, physical activity, resistance training and certain health circumstances.

Older adults may benefit from at least around 1.0 g/kg/day, while people undertaking substantial exercise often use higher targets.

The most important lesson is simple:

Calculate protein according to the person—not according to a social-media trend.

And don't allow protein obsession to push vegetables, fruit, fibre-rich foods, whole grains and healthy fats out of your diet.

If you have kidney disease, another significant medical condition, are pregnant, are recovering from serious illness or have specialised athletic requirements, seek individual nutritional advice rather than relying solely on a general protein calculator.

Medical disclaimer: This article provides general health and nutrition information and is not a substitute for personalised advice from a qualified healthcare professional or registered dietitian.

Sources and Further Reading

European Society for Clinical Nutrition and Metabolism — ESPEN Scientific Guidelines

https://www.espen.org/guidelines/espen-scientific-guidelines-pdf-versions

ESPEN — Clinical Nutrition and Hydration in Geriatrics

https://2022.espen.org/files/ESPEN-Guidelines/ESPEN_practical_guideline_Clinical_nutrition_and_hydration_in_geriatrics.pdf

PubMed — Evidence on Protein Intake, Lean Body Mass and Function in Adults Aged 50+

https://pubmed.ncbi.nlm.nih.gov/42105861/

PubMed — Resistance Training and Muscle Health in Older Adults With Sarcopenia

https://pubmed.ncbi.nlm.nih.gov/41212331/