How many nutrient groups are referenced as necessary for a healthy diet?

• A. Five
• B. Six
• C. Four
• D. Seven

Answer: (B)

Six essential nutrient groups are typically recognized as necessary for a healthy diet. They include the three macronutrients—carbohydrates, proteins, and fats—that provide energy and build or repair tissues; and the two micronutrient types—vitamins and minerals—that support metabolism and bodily functions. In addition, water is considered an essential nutrient because it enables hydration, digestion, circulation, temperature regulation, and overall bodily processes. Because these six categories cover all the nutrients the body relies on, six is the standard number referenced for a healthy diet. Four would leave out a fundamental group, five would miss either water or one micronutrient category, and seven introduces an extra, nonstandard category.