People have been processing foods since the beginning. (1) Changing texture by removing rough parts, beating into mushes. (2) Heat processing, boiling, roasting

People have been processing foods since the beginning. (1) Changing texture by removing rough parts, beating into mushes. (2) Heat processing, boiling, roasting, frying, soups. (3) Dehydrating, drying (4) Fermenting. Modern industrial food processing uses machines and mass production. Adds chemicals like sugar, starch, salt, spice, nitrates, phosphates ... Probably too much of this.