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How Much Protein per Day to Build Muscle?

By Douglas AraújoUpdated 2 min read

Exercise professional · creator of the Letz method

Short answer

For those doing resistance training, the literature shows gains in mass and strength up to about 1.6 g of protein per kilogram of body weight daily, with little additional benefit beyond that. In a calorie deficit, this requirement rises, and distributing protein across meals produces a better stimulus than concentrating it in one.

The Reference Number

The most widely cited meta-analysis in the field finds that gains in lean mass and strength increase alongside protein intake up to about 1.6 g per kilogram of body weight per day, with small and uncertain additional benefits beyond this threshold for healthy adults who do resistance training.

This is a reference benchmark for people who train, not a general public health recommendation. It already includes a safety margin: most of the benefit occurs well before reaching the upper end of the range.

What Changes in a Deficit

Eating fewer calories changes the equation. In a deficit, protein takes on the role of protecting lean tissue, and requirements rise—the larger the deficit and the lower the body fat, the greater the demand.

A controlled trial involving an aggressive deficit and training compared high and moderate protein intakes: the higher-protein group preserved lean mass better and even gained mass. Reviews on hypocaloric diets point in the same direction.

Distribution and Timing

Distributing protein across the day's meals produces a better stimulus for protein synthesis than concentrating the entire amount into a single sitting. It is a low-cost adjustment with a genuine effect.

Meanwhile, the so-called anabolic window—the notion that a narrow post-workout interval exists during which protein must be consumed—does not hold up as a decisive variable. Total daily intake and distribution matter far more than the clock.

Older adults are a noteworthy exception: they require more protein per meal to trigger the same stimulus, making distribution even more relevant in this age group.

Frequently asked questions

Does 1.6 g per kilogram apply when losing weight?

It is the floor, not the ceiling. In a calorie deficit, requirements increase, and the larger the deficit and lower the body fat, the more protein is needed to preserve lean tissue.

Is there any benefit to eating more than 2 g per kilogram?

For healthy adults doing resistance training, the additional benefit above roughly 1.6 g/kg is small and uncertain. In an aggressive deficit, higher intakes do have empirical support.

Do I need to take protein right after a workout?

A narrow anabolic window does not hold up as a decisive variable. Daily total intake and distribution across meals carry far more weight than the exact time until the next meal.

Registry rules cited here

  • Protein and Training AdaptationSufficient protein can support gains in lean mass and strength alongside training; the response varies and does not increase indefinitely with higher intakes.
  • Higher Protein Intake During a Calorie DeficitIn a deficit, higher protein protects lean mass and can even allow muscle gain alongside intense training; the effective range rises to approximately 1.6 to 2.4 g/kg.
  • Distribute protein throughout the dayDividing protein into servings of around 0.4 g/kg across four or more meals stimulates protein synthesis more than concentrating everything into one or two.
  • Protein in older adultsOlder adults need more protein per meal to stimulate muscle synthesis; consensus guidelines recommend 1.0 to 1.2 g/kg/day or more for those who train.
  • Nutrient timing and the anabolic windowTotal daily protein intake matters more than exact timing; the so-called anabolic window is broad, and consuming protein within a few hours around training is sufficient.

Sources cited

Informational content about training and nutrition. It is not a recommendation, prescription or adjustment of any medication, and it does not replace assessment by your doctor or dietitian.

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