Why Are Vitamins Named after Letters?维生素为什么要以字母命名？

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We all know that vitamins are essential for our health， but how did they get their names and when were they found in the first place？

我们都知道维生素对健康至关重要，但它们的名字是怎么得来的？它们是什么时候被发现的？

Though humans have always understood there’s a connection between diet and health， it took thousands of years for modern nutrition research to emerge. Then in 1838， Dutch chemist Gerardus Johannis Mulder proposed the existence of a compound he called protein， which he argued played a “principal role” in nourishment. For decades， protein was considered the “true nutrient” for human health， despite emerging knowledge that fruit， vegetables， and milk eased conditions such as scurvy and rickets.

尽管人类一直都知道饮食与健康之间存在联系，但现代营养学研究却在几千年之后才出现。（剩余2892字）