Crossword clues for Food substance. 6 letters:STARCHFood substance.DIGESTConvert food into absorbable substancesNUTRIENTFood substance.FATSFood substances.NUTRIENTHealth-food substanceVITAMINSubstance in food.PTOMAINESubstance falsely tied to food poisoningFOILMetallic substance used in refrigerating foods.