Food vitamins and minerals can lead to diseases that can have far-reaching effects on health. For instance, 30% of the world's population either has, or is at risk for developing, iodine deficiency. It is estimated that at least 3 million children are blind due to vitamin A deficiency. Vitamin C deficiency results in scurvy. Calcium, Vitamin D, and phosphorus are inter-related; the consumption of each may affect the absorption of the others. Kwashiorkor and marasmus are childhood disorders caused by lack of dietary protein. Many individuals limit what foods they eat for reasons of morality, or other habit. For instance, vegetarians
Customs and traditions of the Royal Navy by others, include "Matelot" (pronounced "matlow", and derived from mid 19th century (nautical slang): from French, variant of matenot which was also taken from the Middle Dutch mattenoot ‘bed companion’, because sailors had to share hammocks in twos, and "Limey", from the Lime-juice given to British sailors to combat scurvy - mainly redundant in use within the Royal Navy. Royal Marines are fondly known as "Bootnecks" or often just as "Royals". Uckers is a two player board game similar to Ludo that is traditionally played in the Royal Navy. It is fiercely competitive and rules differ between ships and stations