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"In 1740 Admiral Vernon was the first to serve rum diluted with water and lime juice to seamen, instead of neat rum, and his sailors called the new drink 'grog'. The purpose was chiefly to increase resistance to the disease, scurvy, which resulted from vitamin C deficiency. The practise of ensuring a regular intake of vitamin C in this way also gave rise to the term 'limey', used by foreigners initally to mean a British seaman, and later extended to British men generally. (With thanks to Katherine Hull)"