Fats provide storage and insulation for your body. Carbohydrates and proteins that are not needed for energy are stored as fat. These compounds are needed in very small amounts in the diet to regulate chemical reactions in the body. Each vitamin has a specific job in your body, so one vitamin can't replace another. Vitamins do not provide energy but they help our bodies use the energy from foods.
Water carries nutrients to cells and removes wastes products.
Water is also needed to help regulate body temperature.