Why mixing Daily and Deli in one targeting model destroys both Deli — food for satisfying appetite Human needs are in constant competition. Biological needs compete with social and even spiritual ones. Eating, at its core, is an entirely physiological process. Food is energy — a kind of “fuel” for the entire body and its “flight control center,” the brain. Hunger is one of the most ancient instincts that has shaped human evolution, driving the development of tools, cognitive