How Much Protein Do You Actually Need Daily to Build Muscle?
Most people either eat far too little protein and wonder why they are not recovering well, or stress over hitting an impossibly high number they read on a supplement website. The research lands in a much more practical place.
The Short Answer
For most resistance-training adults, a daily intake between 1.6 and 2.2 grams of protein per kilogram of bodyweight covers the full range of what studies have shown to be effective for maximising muscle protein synthesis.
Why Protein Matters for Training
Skeletal muscle is in a constant state of turnover. Muscle protein synthesis (MPS) — the process of building new muscle tissue — runs in parallel with muscle protein breakdown (MPB). Whether you gain muscle, lose it, or maintain it depends on which side of that equation dominates over time.
Resistance training powerfully stimulates MPS. But MPS requires amino acids as raw material. Without adequate dietary protein, the anabolic signal from training cannot be fully acted upon. This is why protein intake is arguably the most important nutritional variable for anyone who trains.
What the Research Actually Shows
A landmark 2018 meta-analysis by Morton and colleagues examined 49 studies and over 1,800 participants to determine the protein intake threshold for maximising training-induced gains in muscle mass. The findings were clear: gains plateau at approximately 1.62g per kilogram of bodyweight per day for most individuals.
A 2022 updated meta-analysis extended this, suggesting the upper threshold may sit closer to 2.2g/kg for some individuals — particularly those in a caloric deficit or with high training volumes, where muscle breakdown is elevated.
For practical purposes, targeting 1.8–2.0g/kg covers the vast majority of people in the vast majority of training contexts.
How to Calculate Your Target
Standard Daily Calculation Formula:
Example scenario: An 80kg individual would calculate their intake as follows: 80 × 1.8 = 144g of protein per day.
Note: If you track your weight in pounds, divide your total weight by 2.2 first to find your metric weight in kilograms, then multiply by 1.8.
For those in an active fat-loss phase, slightly higher intakes (up to 2.4g/kg) are supported by research specifically for lean mass preservation during a caloric deficit.
Does Timing Matter?
The concept of the "anabolic window" — the idea that you must consume protein immediately after training or miss the adaptation — has been largely revised by research. While post-workout protein does contribute to MPS, total daily intake matters far more than precise timing.
What does matter meaningfully is distribution: spreading protein across three to five meals throughout the day, each containing 0.4–0.55g/kg of bodyweight, appears to maximise MPS compared to consuming the same total in one or two large meals.
Complete vs Incomplete Protein Sources
Not all protein sources are equivalent. Complete proteins — those containing all nine essential amino acids in adequate amounts — are most effective for stimulating MPS. These include:
- Meat, poultry, and fish
- Eggs and dairy
- Soy (the only complete plant protein)
- Protein supplements derived from whey, casein, or soy
Plant-based athletes can meet protein targets effectively by combining complementary sources throughout the day — rice and legumes, for example — to ensure all essential amino acids are represented.
Practical Food Sources and Their Protein Content
Building your daily intake around whole foods makes hitting your targets sustainable. Use these common profiles to plan your shopping list:
Key Takeaways
- Target 1.6–2.2g of protein per kilogram of bodyweight daily.
- Spread your total intake across 3–5 balanced meals for optimal metabolic distribution.
- Total cumulative daily intake carries vastly higher priority than split-second nutrient timing.
- Prioritise complete amino acid profiles to ensure efficient tissue recovery.
- Incorporate higher targets during deficit phases to safeguard lean muscle tissue from wasting.
Tracking Your Macros? Consistently hitting your targets is significantly easier with structured data. Our Nutrition Planning Bundle automates macro assignments by bodyweight and contains pre-formatted meal templates to simplify your prep.
References
- Morton RW et al. (2018). A systematic review, meta-analysis and meta-regression of the effect of protein supplementation on resistance training-induced gains in muscle mass and strength. British Journal of Sports Medicine.
- Stokes T et al. (2018). Recent perspectives regarding the role of dietary protein for the promotion of muscle hypertrophy. Nutrients.
- Areta JL et al. (2013). Timing and distribution of protein ingestion during prolonged recovery from resistance exercise. Journal of Physiology.
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