Final answer:
Essential nutrients are substances that the body needs and cannot produce, while nonessential nutrients can be synthesized by the body. Carbohydrates, proteins, lipids, and water are macronutrients that provide energy to the body.
Step-by-step explanation:
Essential nutrients are substances that the body needs for proper functioning but cannot produce on its own, so they must be obtained from food. Nonessential nutrients, on the other hand, can be synthesized by the body and are not necessary for proper body function. Macr%onutrients are needed in relatively large amounts and include carbohydrates, proteins, lipids, and water, all of which provide energy to the body.