Which of the following is NOT one of the six key nutrients?

The six key nutrients essential for human health are carbohydrates, proteins, fats, vitamins, minerals, and water. While sugars are a form of carbohydrates, they are not categorized as a separate nutrient. Instead, they are classified as simple carbohydrates that provide energy. The other options, vitamins, fats, and proteins, all represent distinct categories of nutrients critical to various bodily functions, including growth, repair, hormone production, and biochemical processes. Thus, sugars, being a specific type of carbohydrate rather than a standalone nutrient, is why this answer is correct.