Which of the following are classified as non-fuel nutrients?

The classification of non-fuel nutrients is critical for understanding the body's nutritional needs. Non-fuel nutrients are those that do not provide energy (calories) to the body but are essential for various physiological functions. The correct answer includes vitamins, minerals, and water, all of which play vital roles in maintaining health.

Vitamins are organic compounds that assist in many biochemical reactions in the body, supporting processes such as immune function, energy production, and cellular repair. Minerals, such as calcium and iron, are inorganic substances needed for functions like bone health and oxygen transport. Water is essential for hydration, temperature regulation, and as a medium for biochemical reactions.

The other options include substances that either provide energy or do not represent a clear category of non-fuel nutrients. For instance, carbohydrates, proteins, and fats provide the body with energy, classifying them as fuel nutrients. Electrolytes, while important for hydration and nerve function, are not a standalone category of non-fuel nutrients in this context. Lastly, fibers and oils, found in the final option, either have energy-providing properties or do not fit the definition of non-fuel nutrients as clearly as vitamins, minerals, and water do. Thus, the identification of vitamins, minerals