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Skin

The body's largest organ, and a visible reflection of hydration, sun and sleep.

Skin is influenced by a handful of everyday factors you can track: fluid intake, sleep, a varied diet with enough vitamin C for collagen, and — the one that dominates long-term skin ageing — sun exposure. None of these is a miracle lever, but sun protection in particular has more evidence behind it than almost anything sold for the purpose.

The honest position on skin and diet is that dramatic claims outrun the evidence. Staying hydrated, sleeping enough and eating a varied diet support skin as they support everything else; they do not transform it. What genuinely protects skin over decades is not smoking and not burning.

Sleep and stress do show on the skin in the short term, which is one reason the same habits that help the rest of the body help here. A simple, gentle routine and steady basics beat an elaborate regimen, and they are cheaper.

Metrics that relate to skin

• Hydration
• Sleep
• Vitamin C and varied diet
• Sun habits

Calculators and reference pages that apply

Each of these is a real page on this site, chosen because it relates to this system:

The everyday levers

• Sun protection — the biggest lever for long-term skin.
• Enough fluid and sleep.
• A varied diet with vitamin C; not smoking.

What tracking can and cannot tell you

Tracking supports skin only indirectly, through hydration, sleep and diet. A changing mole or a persistent skin problem is a reason to see a doctor, not to adjust a supplement.

Frequently asked questions

Other systems

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