Answer:
Food analogs are natural or manufactured substances that are used in place of a traditional food or a food ingredient.
A little extra :) 
Food analogs are used in place of traditional food products or ingredients. They are designed to serve one or more of the following purposes :
 -Save money 
-Change the nutritive value of foods 
-Improve the performance of foods or compounds 
-Take the place of foods or food ingredients that are restricted for health reasons
Hope this Helps! :)