Agency (FEMA) has established guidelines for rationing food and water when replacements are not available. According to FEMA standards, every person should have a minimum of per day of water, and more for children, nursing mothers, and the ill. Origins Military sieges have often resulted in shortages of food and other essentials. In such circumstances, the rations allocated to an individual are often determined based on age, sex, race or social standing. During the Siege of Lucknow (part of the Indian Rebellion of 1857) a woman received three-quarters of a man's food ration. Children received only half. During the Siege of Ladysmith in the early stages of the Boer War in 1900 white adults received the same food rations as soldiers while children received half that. Food rations for Indian people and black people were significantly smaller. The first modern rationing systems were imposed during the First World War. In Germany, suffering from the effects of the British blockade, a rationing system was introduced in 1914 and was steadily expanded over the following years as the situation worsened. Although Britain did not suffer from food shortages, as the sea lanes were kept open for food imports, panic buying towards the end of the war prompted the rationing of first sugar and then meat. It is said to have benefited the overall health of the country, through the "levelling of consumption of essential foodstuffs". To assist with rationing, ration books were introduced on 1918 for butter, margarine, lard, meat, and sugar. During the war, average caloric intake decreased only three percent, but protein intake six percent. Food rationing appeared in Poland after the First World War, and ration stamps were in use until the end of the Polish–Soviet War. Second World War Rationing became common during the Second World War. Ration stamps were often used. These were redeemable stamps or coupons, and every family was issued a set number of each kind of stamp based on the size of the family, ages of children, and income. The British Ministry of Food refined the rationing process in the early 1940s to ensure the population did not starve when food imports were severely restricted and local production limited due to the large number of men fighting the war. Rationing on a scientific basis was pioneered by Elsie Widdowson and Robert McCance at the Department of Experimental Medicine, University of Cambridge. They worked on