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1747-1940s · vitamin era

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1747-1940s · 维生素时代

The discovery of vitamins is one of the most brilliant chapters of 19th-20th century nutrition science — in under two centuries, a handful of physicians and chemists walked from "why do sailors get scurvy?" all the way to "folate-fortified flour", and the classic deficiency diseases nearly vanished from developed countries. But this same chapter planted the seed of the extended expectation that "supplementing more prevents more disease" — which 50 subsequent years of RCTs had to disentangle:

1747 — James Lind ran the first human controlled trial aboard HMS Salisbury: 12 scurvy sailors split into 6 groups eating different diets → the citrus group recovered in 5 days. First evidence that 'something in food cures disease' (though he didn't isolate vitamin C — that waited for Szent-Györgyi in 1932).

1881 — Russian chemist Lunin showed that purified nutrients alone couldn't sustain animals — there had to be an extra factor in food.

1897 — Dutch physician Eijkman in a Java prison: inmates eating polished rice got beriberi, those eating brown rice didn't — he had discovered an anti-beriberi factor in rice husk.

1912 — Polish chemist Casimir Funk coined the word 'vitamine' (vital amine, later dropping the 'e'). Hypothesis: multiple diseases (scurvy, pellagra, beriberi, rickets) all stem from missing vital factors.

1920-1940s — vitamins were isolated, structurally characterized, and industrially synthesized one by one:

Vitamin C (1932), D (1922-1936), A (1931), B1 (1936), B2 (1933), K (1939), B12 (1948)The success of single vitamins curing specific deficiency diseases during this era sparked the extended hope that multivitamins could prevent multiple chronic diseases.
Post-1940s: Pauling and others pushed megadoses, commercial explosion → the modern multivitamin industry was born here.

The 'expectation' and 'evidence' gap existed from the start — Funk's hypothesis was correct (deficiency diseases are real), but the extended hypothesis that additional supplementation could prevent chronic disease has largely failed in 50 subsequent years of RCTs (see scenes 3 and 4).

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