You don't need more data.
You need one number to hit.

It's called anabolic resistance — and it's the reason the old daily protein guideline (set in the 1980s for young adults to prevent deficiency) doesn't apply to you anymore. Your body's ability to convert protein into muscle becomes less efficient with age. The fix isn't complicated: you need more protein, and you need to hit a threshold at each meal.

Most men over 40 are quietly underestimating this. Not because they're lazy — because no one told them the number changed.

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  Muscle loss is real — and largely preventable. Sarcopenia (age-related muscle loss) accelerates in your 40s and 50s. Protein is the most controllable variable in slowing it down — more so than any supplement.
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  The old daily guidelines weren't built for you. The 0.8g/kg RDA was set to prevent deficiency in young sedentary adults. Current research puts the optimal target for adults 40+ significantly higher — and most people don't know their number changed.
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  You don't need a full nutrition tracker. You need one clear target. Hitting a daily protein goal — consistently — matters more than tracking every calorie or macro. That's the whole idea. See the 30g rule →