During World War I (1914-1918), the Canadian government formed the Canada Food Board to increase agricultural production and encourage frugality here on the home front. It produced a series of colourful posters driving these messages home.
As the above poster indicates, it was illegal to "hoard" foods that were in short supply. Flour, sugar, eggs, meat and fats such as lard and butter were sent to Europe in large quantities to feed Allied troops and civilians at home in Britain. Canadians were encouraged to eat less of them.
Thirteen of these food posters produced during WWI can be viewed on the website of McGill.ca.
The Canada Food Board also created a series of educational illustrations for newspapers. These panels included tips for reducing food waste and for using less bread, sugar, butter and meat. These panels can be viewed on the website of Ontario archives.