How Much Protein Do You Really Need? Beyond the RDA

The number that's quietly too low

Ask how much protein you need and you'll often hear the official figure: 0.8 grams per kilogram of body weight. It sounds authoritative, and it is — for the narrow purpose it was built for. What most people don't realise is that this number was set to prevent deficiency in the general sedentary population, not to optimise muscle, strength, recovery, or body composition. Treating a deficiency-prevention floor as a performance target is one of the most common nutrition misunderstandings. The research on what's actually optimal tells a more generous story.

What the RDA really means

The Recommended Dietary Allowance for protein — that 0.8 g/kg — answers a specific question: what's the least protein that keeps a typical adult from showing signs of deficiency? It's a safety minimum, deliberately conservative, aimed at the whole population including the inactive.

That makes it a floor, not a goal. For someone sedentary who never lifts a weight and isn't dieting, it may be adequate. But for anyone training, trying to preserve muscle while losing fat, or simply ageing, the evidence points consistently higher. Understanding this distinction reframes the whole question: it's not "am I getting the minimum?" but "am I getting the amount that's optimal for my situation?"

What the research supports for different goals

Decades of research — much of it in the last 15 years — have mapped out protein needs by goal reasonably well:

• General health, sedentary: ~0.8–1.0 g/kg. The RDA zone.
• Active / recreational exercisers: ~1.2–1.6 g/kg.
• Building muscle / strength training: ~1.6–2.2 g/kg. This is the well-supported range for maximising muscle protein synthesis in people training hard.
• Fat loss while preserving muscle: often the highest, ~1.8–2.4 g/kg, because adequate protein during a calorie deficit is what protects lean mass and keeps you full.
• Older adults: ~1.0–1.2 g/kg or more, to counter sarcopenia — the age-related loss of muscle that undermines strength and independence.

A 70 kg person building muscle, for instance, lands around 112–154 g per day — well above the ~56 g the RDA implies. The Protein Intake Calculator turns your weight and goal into a target range directly.

Is more protein dangerous?

A persistent worry is that high protein "damages the kidneys." For people with healthy kidneys, the research does not support this — intakes in the athletic ranges above have been studied without evidence of harm to kidney function. Protein is also uniquely satiating (it keeps you full) and muscle-sparing, which is why higher intakes help with fat loss.

The genuine caveat: people with existing kidney disease may need to moderate protein under medical supervision, and anyone with a specific medical condition should follow their doctor's guidance. For the general healthy population, though, the fear of "too much" protein is largely unfounded within sensible ranges — and extremely excessive intake simply offers no extra benefit while crowding out other foods.

The timing myth

Gym lore long held that you must slam protein within a narrow "anabolic window" right after training or waste the session. The research has walked this back substantially. What dominates is your total daily protein; the window is far wider and more forgiving than once believed.

There is a modest benefit to spreading protein across the day — several servings of roughly 20–40 g each appear to support muscle building a little better than one giant dose, because there's a ceiling to how much your body uses for muscle synthesis per sitting. But this is a fine-tuning detail. If you're hitting your daily total from varied sources, you've captured the vast majority of the benefit. Don't let timing anxiety distract from the number that matters: the daily total.

Hitting your target

Good sources make the target achievable: chicken, fish, eggs, dairy, and lean meat are protein-dense and complete; lentils, beans, tofu, tempeh, and seitan cover the plant side (varied across the day to get all amino acids). As a reference, 100 g of chicken breast has ~31 g of protein and an egg ~6 g — so a day's target is a handful of deliberate protein servings, not an impossible mountain.

Setting your target

Enter your weight and goal into the Protein Intake Calculator for a daily protein range. To fit it into your overall calories and the other macros, use the Macro Calculator.

Sources

1. Morton, R. W. et al. Meta-analysis of protein supplementation and resistance training, British Journal of Sports Medicine (2018).
2. International Society of Sports Nutrition (ISSN). Position Stand: Protein and Exercise.
3. Bauer, J. et al. Protein recommendations for older adults (PROT-AGE Study Group).

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This article is for general informational and educational purposes only and is not medical or dietary advice. People with kidney disease or other medical conditions should consult a doctor before increasing protein intake.