Why did the u. s. government impose so many regulations on industrial and food production during the war?

The U.S. government imposes many regulations on industrial and food production during the war due to the change in dynamics in the country. With many people off at war, there are less people able to work in factories. During war, there is a need for certain materials to make weapons and to send food to troops. In the U.S., there was much propaganda that if you weren't rationing, then you were unpatriotic. These regulations helped fund the war and made sure that the military had needed materials.