On 8 January, 1940 (four months after the Second World War started), food rationing came into force.
During the war, there were many shortages of essential foodstuffs, not just luxuries. Many imported goods such as tea, bananas, oranges, and grapes were in short supply. It was to be six or seven years before any of those fruits were seen again. Butter, lard, sweets, cakes, flour and sugar became hard to get too, followed by meat and fish.
Rationing was introduced as a way of ensuring that everybody got a fair share of what was available, and to try to prevent stockpiling.