Carbohydrates provide the main source of energy for the body's daily activities and metabolism, with sources including rice, noodles, potatoes, bread, pasta and sugar cane. While consuming foods and drinks high in simple carbohydrates may lead to tooth decay, fats help prevent heat loss, protect internal organs, and transport fat-soluble vitamins, with plant sources like corn oil, olive oil, and margarine, and animal sources such as butter, lard, and ghee, though consuming too much fat poses health risks.