Charles Glen King was neither the first, nor the only one such person. However, it was he who proved that vitamin C prevents scurvy or scorbute. Cabbage, onions and potato contain the antiscorbutic agent, i.e., ascorbic acid, so people of low status never suffered from scorbute, as their rations mainly included vegetables. Lemons also contain ascorbic acid. Navigator James Cook realized it and included lemons or lemon juice into the diet of sailors. He was even awarded for that with a gold medal of Royal Society, while nickname lemon-eaters stuck to English sailors.