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Paul McNally

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Across 1 decoded pieces of advice. This scores the state of the evidence behind what they say — not them, and not their honesty. Good creators cover contested ground; that shows up here as mixed.

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Extreme, prolonged sun deprivation — like months aboard a nuclear submarine — is exactly the scenario where routine vitamin D supplementation makes real sense: several studies on submarine crews (Royal Navy, US Navy) show levels drop markedly within weeks without it.

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Source: several published studies on submarine crews (Proceedings of the Nutrition Society, Royal Navy; a 1988 US Navy research report; Occupational & Environmental Medicine). Evidence type: controlled trials with blood testing before and after patrol. These converge on the same picture: without supplementation, vitamin D levels drop 17-40% over a 2-3 month patrol with no natural light, while daily supplementation (1000-2400 IU/day across studies) markedly blunts or prevents that decline. This is one of the cleanest examples of a population with genuinely zero sun exposure over an extended period, unlike most sweeping claims that "everyone is low on vitamin D." The post, anecdotal in form (a submariner's life story rather than health content), lands on a solidly documented point. Direction: causal, controlled trials with direct blood measurement.

holds upMar 24, 2026the post

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