The document discusses the 6 essential nutrients: carbohydrates, protein, fats & oils, vitamins, minerals, and water. It explains that essential nutrients cannot be produced by the body and must be obtained through food. Carbohydrates provide energy and come in simple and complex forms. Protein is needed to build and repair tissues. Fats insulate, cushion organs, and transport vitamins. Vitamins and minerals maintain proper body functions. Water is the most important nutrient and helps process vitamins, hydrate the body, and regulate temperature.