A real threat to Britain's food supplies and Britain’s ability to continue the war effort came in 1916 when a new campaign of 'unrestricted submarine warfare' began with deadly effect:
In Britain various measures were taken to prevent starvation.
In December 1917 compulsory rationing was finally introduced after voluntary schemes had failed. The aim of rationing was to conserve food supplies, ensure fair distribution and control rising prices caused by food becoming more scarce.
For wealthy people these price rises were an inconvenience but for the poor they meant less money to spend on other essentials.
Rationing was gradually introduced and was in force throughout Scotland by April 1918:
As a result of these measures, although there was a degree of scarcity, Britain was never faced with food shortages on the same scale as Germany, where in the winter of 1917-1918, over 500,000 German civilians died of starvation.