How Much Protein Do You Need? Complete Guide to Protein Requirements

How much protein you need is one of the most searched nutrition questions on the internet — and one of the most poorly answered. Government guidelines give a figure that’s adequate for most healthy adults but doesn’t account for training goals. Fitness influencers often recommend numbers so high they’re impractical and unnecessary. The evidence points to a well-researched middle ground that depends on your goals, body weight, age, and activity level.

This page gives you evidence-based protein targets for different goals, practical guidance on how to hit them, and answers to the most common protein questions.

Why the RDA Isn’t Enough for Active People

The Recommended Dietary Allowance (RDA) for protein is 0.8 grams per kilogram of body weight per day — the figure in most official guidelines.

The RDA is set to cover the needs of almost all healthy adults for maintaining the body’s protein balance. It isn’t a bare minimum, but it also isn’t designed around training: it doesn’t account for building muscle, recovering from hard training, or preserving muscle while dieting.

For people who train, the research points to higher intakes. A 2018 meta-analysis of resistance training studies found that gains in lean mass increased with protein intake up to about 1.6g per kg per day, with possible further benefits for some people up to about 2.2g per kg. A sedentary person eating 0.8g per kg can be perfectly healthy — but someone training to build or keep muscle will usually benefit from more.

Protein Requirements by Goal

Protein for General Health and Light Activity

Target: 1.0–1.2g per kilogram of body weight per day

For people who exercise lightly — walking, recreational sports, occasional gym sessions — the RDA of 0.8g per kg covers basic needs, and 1.0–1.2g per kg provides a comfortable margin.

Example: 70kg person, lightly active → 70–84g of protein a day

Protein for Muscle Building (Calorie Surplus)

Target: 1.6–2.2g per kilogram of body weight per day

This range comes from the meta-analysis described above: about 1.6g per kg captures most of the benefit for most people, and up to 2.2g per kg covers those who may benefit from more. Sports nutrition organizations recommend similar or slightly lower ranges — 1.4–2.0g per kg from the International Society of Sports Nutrition (ISSN), and 1.2–2.0g per kg from the American College of Sports Medicine and dietitians’ organizations.

As a rough guide to where you might land within the range:

• Recreational lifters training about 3 times a week: 1.6–1.8g per kg
• Intermediate lifters training 4–5 times a week: 1.8–2.0g per kg
• Advanced lifters or very high training volumes: 2.0–2.2g per kg

Above about 2.2g per kg, additional protein brings diminishing returns for muscle growth for most people — the extra is mostly used for energy.

Example: 80kg intermediate lifter → 144–160g of protein a day

Protein for Fat Loss (Calorie Deficit)

Target: 2.0–2.4g per kilogram of body weight per day

Protein needs are higher during fat loss than during a calorie surplus, for two reasons:

Muscle preservation: in a calorie deficit, the body breaks down more of its own tissue, including muscle protein. Higher protein intake — combined with resistance training — helps preserve muscle. In one well-known study, people in a large deficit who ate 2.4g per kg and trained hard gained lean mass while losing fat, compared with those eating 1.2g per kg.

Satiety and the thermic effect: protein is the most filling macronutrient, and digesting it uses more energy than digesting other macronutrients — roughly 20–30% of its calories, compared with about 5–10% for carbohydrates and 0–3% for fat.

For lean, resistance-trained people in an aggressive cut, who are most at risk of losing muscle, some researchers recommend 2.3–3.1g per kg of lean body mass.

Example: 75kg person cutting → 150–180g of protein a day

Protein for Body Recomposition

Target: 1.6–2.2g per kilogram of body weight per day

Body recomposition — losing fat and gaining muscle at the same time — usually happens at calorie maintenance or in a slight deficit, combined with resistance training. It’s most achievable for beginners, people returning to training, and those with more body fat. Protein needs overlap with the muscle-building and fat-loss ranges.

Protein for Endurance Athletes

Target: 1.4–1.8g per kilogram of body weight per day

Endurance athletes often underestimate their protein needs. During long sessions, especially when glycogen runs low, muscles break down some amino acids for fuel — a small share of total energy, but enough to raise protein needs. Repairing and adapting muscle after high training volumes also requires protein. A study in endurance athletes estimated their needs on training days at around 1.6–1.8g per kg. Athletes combining endurance with strength training, or training at very high volumes, may need the upper end of the range.

Protein for Older Adults (Over 65)

Target: at least 1.0–1.2g per kilogram of body weight per day; 1.2–1.6g per kg for those doing resistance training

Expert groups, including the PROT-AGE study group and the European Society for Clinical Nutrition and Metabolism (ESPEN), recommend at least 1.0–1.2g per kg for healthy older adults, and more (1.2–1.5g per kg) for those with acute or chronic illness. Older adults who train regularly may benefit from the higher end. There are two main reasons needs rise with age:

Anabolic resistance: older muscle responds less to a given dose of protein. Studies suggest older adults need about 0.4g per kg per meal — roughly 25–40g for most people — to maximize the muscle-building response, compared with about 0.25g per kg in younger adults.

Sarcopenia: the gradual loss of muscle mass and strength with age contributes to falls, fractures, and loss of independence. Resistance training, combined with adequate protein, is the most effective strategy for slowing it.

Example: 70kg person aged 70 → at least 70–84g of protein a day; 84–112g if training regularly

Older adults with kidney disease should follow their doctor’s advice on protein intake.

Protein for Vegans and Vegetarians

Target: the same ranges as above — with a small cushion if most of your protein comes from grains and beans

Plant proteins are generally a little lower in leucine and somewhat less digestible than animal proteins, and grains are low in lysine. But eating enough of them closes the gap: in a 2021 study, young men on a vegan diet who ate 1.6g of protein per kg — much of it from soy protein — gained muscle just as well as omnivores eating the same amount of protein.

Soy, pea protein, and other concentrated plant proteins work well. If most of your protein comes from less digestible whole foods such as grains and beans, adding about 10% to your target is a sensible margin.

Example: 75kg vegan lifter building muscle → 120–165g a day, or about 132–182g if relying mainly on grains and beans

Including legumes or soy foods every day — for lysine — and varying your protein sources throughout the day gives a complete amino acid profile.

Protein Requirements Summary Table

How Much Protein Can Your Body Use Per Meal?

One of the most persistent fitness myths is that your body can only absorb about 30g of protein per meal, and anything more is wasted. That’s not true.

Your body absorbs almost all the protein you eat — larger meals simply take longer to digest and absorb.

Earlier research suggested that about 20–40g of protein per meal maximized muscle protein synthesis, with little extra benefit above that. Newer research has changed this picture: in a 2023 study, 100g of protein after exercise produced a larger and longer-lasting muscle-building response than 25g, with the effect stretching over more than 12 hours. Larger protein meals aren’t wasted — the body uses them over a longer period.

The practical implication: total daily protein matters most. Spreading protein across 3–5 meals of about 20–40g each is a sensible, practical approach, but if your schedule means eating protein in fewer, larger meals, that works too.

Protein Distribution: Spreading Protein Through the Day

Total daily intake is the priority, but spreading protein across the day is a sensible way to reach it and to keep muscle-building signals going throughout the day.

Aim for 3–5 Protein-Containing Meals a Day

Giving each meal a meaningful protein dose — about 20–40g, or roughly 0.3–0.4g per kg — makes high daily targets easier to reach.

A practical framework for an 80kg lifter targeting about 160g of protein a day:

• Breakfast: 35–40g of protein (eggs, Greek yogurt, a whey shake)
• Lunch: 35–40g of protein (chicken breast, tuna, turkey)
• Post-workout snack: 25–30g of protein (whey shake, cottage cheese)
• Dinner: 35–40g of protein (beef, salmon, pork, tofu)
• Before bed (optional): 30–40g of protein (casein, cottage cheese, Greek yogurt)

Don’t Neglect Breakfast Protein

Many people eat little protein at breakfast and most at dinner. Some studies suggest a protein-rich breakfast helps with appetite control later in the day, and it makes your daily target much easier to reach.

Pre-Sleep Protein Is a Useful Option

Eating 30–40g of slow-digesting protein — such as casein protein, cottage cheese, or Greek yogurt — before bed increases muscle protein synthesis overnight and provides amino acids during sleep. When total daily protein is matched, though, studies haven’t shown clear extra benefits for muscle growth — so its main value is as a convenient way to reach your daily target.

Post-Workout Protein Is Useful but Not Urgent

The “anabolic window” is far wider than the 30-minute rush often described — muscle stays more responsive to protein for at least 24 hours after training. A protein-rich meal or shake within a couple of hours of training, especially if you trained without eating beforehand, is a practical guideline.

How to Calculate Your Personal Protein Target

Step 1: Know your body weight. Use your current body weight in kilograms. If you have a lot of body fat to lose, using your target body weight, or lean body mass, gives a more practical figure, because protein needs relate mainly to lean tissue rather than fat.

Step 2: Identify your goal. Muscle building, fat loss, maintenance, or endurance — your goal determines which range to use from the table above.

Step 3: Choose your position in the range. Use the lower end if you’re a beginner or train less; the higher end if you’re advanced, train frequently, are in a calorie deficit, or are older and training.

Step 4: Calculate your daily target. Multiply your body weight in kg by your chosen protein intake per kg.

Example calculation:

• Body weight: 85kg
• Goal: muscle building, intermediate lifter training 4 times a week
• Target: 2.0g per kg
• Daily protein target: 85 × 2.0 = 170g of protein a day
• Per meal (4 meals): about 42g per meal

Use our Macro Calculator to calculate your personal protein target alongside your carbohydrate and fat targets.

How to Hit Your Protein Target Every Day

Build Meals Around Protein

The most effective strategy is to choose the protein source first when planning each meal, then build the rest of the meal around it. Chicken breast, eggs, fish, Greek yogurt, cottage cheese, tofu — choose your protein anchor, then add carbohydrates, fats, and vegetables.

Use Protein Supplements When Helpful

When whole foods won’t cover your daily target — because of time, appetite, or practicality — protein powders bridge the gap. A whey protein shake typically provides 20–30g of high-quality protein in seconds. If you compete in drug-tested sport, choose third-party tested products.

Keep High-Protein Foods on Hand

Meal prepping — cooking a batch of chicken breast, hard-boiling eggs, portioning Greek yogurt — makes protein convenient. When high-protein options are ready to eat, you’re far more likely to hit your target consistently.

Track Your Intake at First

If you’re new to protein targets, tracking your intake for 2–4 weeks with a food tracking app is valuable. Many people find they eat less protein than they thought, and a period of tracking builds an intuitive sense of portion sizes that makes ongoing monitoring easier.

Know Your Protein Landmarks

Knowing the approximate protein content of the foods you eat most often saves looking everything up:

• Chicken breast (100g, cooked): about 32g of protein
• Beef mince, 80% lean (100g, cooked): about 26g
• Salmon (100g, cooked): about 22g farmed, about 25g wild
• Tuna, light, canned in water (100g, drained): about 19g — brands vary
• Egg (1 large): about 6g
• Greek yogurt, plain nonfat (170g): about 17–18g
• Cottage cheese, low-fat (100g): about 11g
• Lentils (100g, cooked): about 9g
• Whey protein (1 scoop): usually 20–30g — check the label

Is There Such a Thing as Too Much Protein?

Kidneys: in healthy people with normal kidney function, the protein intakes discussed on this page haven’t been shown to cause kidney damage. People with kidney disease — or with diabetes or high blood pressure affecting the kidneys — should follow their doctor’s advice on protein. People prone to kidney stones may also need to moderate very high intakes of animal protein.

The practical ceiling for muscle building: above about 2.2g per kg, extra protein brings diminishing returns for muscle growth, and the excess is mostly used for energy. Eating 300g of protein a day when 180g would do the same job is unnecessary and expensive.

Very high intakes: the liver can only convert so much protein nitrogen into urea. Diets where protein supplies a very large share of calories — well beyond the ranges on this page — can cause nausea, diarrhea, and fatigue, which is why protein-only diets don’t work. Upper limits of around 3.5g per kg per day have been suggested for well-adapted adults.

Balance: very high protein intakes can crowd out carbohydrates that fuel training and the fats, fiber, and micronutrients that support overall health. Hitting your protein target alongside adequate carbohydrates and fats matters more than pushing protein higher.

Body Size and Protein Needs

Lean Body Mass vs. Total Body Weight

For people carrying a lot of body fat, calculating protein from total body weight can give unrealistically high numbers. Because protein needs relate mainly to lean tissue, using lean body mass or a target body weight gives a more practical figure.

Example: 120kg person with 40% body fat

• Lean body mass: about 72kg
• Protein target at 2.0g per kg of lean mass: 144g a day
• Protein target at 2.0g per kg of total weight: 240g a day — unnecessarily high

Hardgainers

People who struggle to gain weight usually need more total calories, not dramatically more protein. Aim for the muscle-building range, and focus on eating enough overall — energy-dense foods, liquid calories such as smoothies, and regular meals help.

Larger, More Muscular People

Because targets are calculated per kilogram, larger and more muscular people automatically get higher targets — no extra adjustment is needed.

Frequently Asked Questions About Protein Requirements

Should I eat more protein on training days than rest days? Keep your intake similar on rest days. Muscle stays more responsive to protein for a day or two after training, so rest-day protein supports recovery too.

Does protein timing matter as much as total daily intake? No — total daily protein is the main driver of results. Timing strategies, such as spreading protein across meals or eating protein after training, are sensible ways to reach your total, with smaller effects of their own.

Will eating more protein help me lose weight faster? Protein helps fat loss through satiety, its thermic effect, and preserving muscle in a deficit. But the fundamental driver of fat loss is a calorie deficit. Protein improves what happens within that deficit — it doesn’t replace it.

What if I can’t eat enough protein from whole foods? Protein powders — whey, casein, soy, or pea — are a practical way to close the gap. They’re food-derived products that provide the same amino acids as whole foods.

Does cooking affect protein content? Cooking doesn’t destroy a meaningful amount of protein, but it changes the weight of food. Meat loses water as it cooks, so per 100g, cooked meat contains more protein than raw meat — for example, about 22–23g in raw chicken breast versus about 31–32g cooked. Food databases list both raw and cooked values, while packaged meat labels usually give raw values. The key is consistency: weigh food raw and use raw values, or weigh it cooked and use cooked values.

Related Pages

• Best Time to Take Protein — protein timing guide
• Basic Nutrition — macronutrient fundamentals
• Macro Calculator — calculate your personal protein target
• Calorie Calculator — find your daily calorie target

Protein values: USDA FoodData Central — chicken breast, skinless, boneless, cooked (Foundation 331960); ground beef, 80% lean, broiled patty (SR Legacy 171797); Atlantic salmon, farmed, cooked (SR Legacy 175168) and wild, cooked (SR Legacy 171998); light tuna, canned in water (Foundation 334194); egg, hard-boiled (SR Legacy 173424, per 50g large egg); Greek yogurt, plain, nonfat (Foundation 330137); cottage cheese, low-fat, 2% (Foundation 328841); lentils, cooked (SR Legacy 172421).