Which of the following is NOT an essential nutrient?

Sugars are classified as a type of carbohydrate, and while they can provide energy, they are not considered essential nutrients in the same manner as water, proteins, and vitamins. Essential nutrients are those that the body cannot synthesize on its own and must obtain from the diet to sustain life and support growth.

Water is vital for all bodily functions; proteins are crucial for building, repairing tissues, and making enzymes and hormones; and vitamins are necessary for various metabolic processes and overall health. Sugars can offer a quick source of energy but are not required in the diet, as the body can derive its necessary energy from other carbohydrates, such as starches and fibers. Thus, while sugars can be part of a balanced diet, they do not fulfill the criteria of being essential nutrients.