The purpose of the food administration was encourage people to grow

The food administration was done to encourage food conservation to avoid any kind of food wastage.

Explanation:

Food administration was started in the United States of America and the purpose to start this was to encourage conserving food by the people. Since food is needed to live, this program was started to encourage people to save food so that this food can be used to save the army of the United States which is ever growing. There were situations of famine in Europe and the saved food could also go to the European countries to feed the hungry people.