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How Much Protein Do You Actually Need Per Day?

Recommended daily protein intake is usually expressed per kilogram of body weight rather than as one fixed number, and the right range for you depends heavily on how active you are.

The baseline: about 0.8g per kg of body weight

This commonly cited figure represents a minimum intake intended to prevent deficiency in a generally sedentary adult, not necessarily an amount optimized for building muscle or supporting an active lifestyle.

Active and strength-training adults: roughly 1.2-2.0g per kg

People doing regular resistance training or intense activity commonly need meaningfully more than the sedentary baseline, with figures in this range frequently cited across sports nutrition guidance for supporting muscle repair and growth.

Endurance athletes often fall in a similar or slightly lower range

Sustained endurance training also increases protein needs above sedentary levels, generally cited in a broadly similar range to strength training, though the exact figure depends on training volume and intensity.

Older adults often benefit from higher intake

Because muscle mass and strength naturally tend to decline with age (sarcopenia), guidance for older adults frequently suggests intake toward the higher end of typical ranges, or above the general sedentary baseline, to help offset that decline.

Spreading protein across meals is commonly recommended

Distributing protein intake across three or more meals β€” often cited as roughly 20-40g per meal β€” is frequently suggested as more effective for muscle protein synthesis than consuming the bulk of daily protein in a single meal.

More is not indefinitely better

Beyond a certain point, additional protein intake generally shows diminishing returns for muscle-building purposes in most people, so significantly exceeding the higher end of these ranges is not typically necessary for most goals.

Why "per kilogram" beats a single fixed gram target

A flat number like "aim for 100g of protein a day" ignores that a 50kg person and a 100kg person have very different bodies to maintain or build. Expressing the target per kilogram of body weight scales the recommendation to the individual, which is why nutrition guidance almost always uses this format rather than one number for everyone.

Common misconceptions worth clearing up

The idea that high protein intake damages healthy kidneys is not well supported by evidence in people without pre-existing kidney disease, though anyone with a kidney condition should follow their doctor's specific guidance. Similarly, the idea of a narrow post-workout "anabolic window" that must be hit within minutes has been considerably overstated compared to what total daily intake actually contributes. This is general nutrition information, not medical advice.

Frequently Asked Questions

Is more protein always better for building muscle?

No β€” intake beyond the commonly cited higher-activity range generally shows diminishing returns for most people's muscle-building goals, since training stimulus and overall calorie intake also play major roles.

Do I need protein powder or supplements to hit my target?

Not necessarily. Whole foods like meat, fish, eggs, dairy, legumes, and tofu can meet most people's protein targets; supplements are simply a convenient option, not a requirement, for reaching a given daily gram target.