International Sports Sciences Association (ISSA) Fitness Nutrition Practice Test

Fats play a crucial role in nutrition, and option B correctly highlights two significant functions they serve in the body. First, fats are a key source of energy, providing more than double the energy per gram compared to carbohydrates and proteins. This energy reserve is vital, especially during prolonged physical activities when glycogen stores may be depleted.

Secondly, fats are essential for membrane fluidity. They are a major component of cell membranes, where they help maintain structural integrity and fluidity. This fluidity is critical for the proper function of cells, including nutrient transport and communication between cells.

Moreover, fats contribute to the absorption of fat-soluble vitamins (A, D, E, and K), which are vital for various bodily functions, including vision, bone health, and antioxidant activity. While it's true that fats should be consumed in moderation, they are still an essential macronutrient and cannot be completely eliminated from the diet without negative health consequences. This comprehensive understanding illustrates why statement B is accurate and underscores the vital functions of fats in overall health and nutrition.