NANP Board Practice Exam 2026 - Free NANP Board Practice Questions and Study Guide

The correct answer is omega-3 fatty acids, as they are classified as essential nutrients because the human body cannot synthesize them and must obtain them from dietary sources. Essential nutrients are those that the body needs for various functions but cannot produce on its own or in sufficient quantities. Omega-3 fatty acids play a critical role in brain function, cardiovascular health, and anti-inflammatory processes.

Carbohydrates, although important for energy, are not classified as essential because the body can produce glucose from other macronutrients through gluconeogenesis. Fiber, while important for digestive health, is not considered an essential nutrient in the same way that omega-3 fatty acids are. Proteins are important for numerous bodily functions, but the body can produce certain amino acids (non-essential amino acids) and only requires essential amino acids from food sources. Thus, omega-3 fatty acids stand out as the nutrient that must be sourced from the diet due to the body's inability to synthesize them.