Scientists say humans are built to live to 120, but even the healthiest people only live to 80 — so something else must be limiting lifespan.
Evidence from Studies
Supporting (2)
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Longer-lived animals have better internal repair systems for their cells. This suggests that even if humans ate perfectly, our bodies might still wear out faster because we don’t repair ourselves as well as some other animals.
This paper says we’re not hitting a biological wall at 120 years — we’re just not using the right medical tools yet. If we did, people could live longer, meaning diet isn’t the main thing holding us back.
Contradicting (2)
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Eating less protein helped mice live longer and stay healthier — so what you eat really does affect how long you live, even if you’re already in good shape.
Changing what you eat — specifically cutting back on certain proteins — can make animals live longer. This means diet might be a bigger factor than the claim says.