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The passage tells us that before the discovery of vitamins, ......................
The value of certain foods in maintaining health was recognised long before the first vitamins were
actually identified. In the 18th century, for example, it had been demonstrated that the addition of
citrus fruits to the diet would prevent the development of scurvy. In the 19th century it was shown that
substituting unpolished for polished rice in a rice-based diet would prevent the development of
beriberi. In 1906 the British biochemist Frederick Hopkins demonstrated that foods contained
necessary "accessory factors" in addition to proteins, carbohydrates, fats, minerals and water. In 1911
the Polish chemist Casimir Funk discovered that the anti-beriberi substance in unpolished rice was an
amine — a type of nitrogen-containing compound, so Funk proposed that it should be named vitamine
— for "vital amine". This term soon came to be applied to the accessory factors in general. It was later
discovered that many vitamins do not contain amines at all, yet because of its widespread use, Funk's
term continued to be applied, but the final letter e was dropped.