What role do fats play in the body?

Fats play a crucial role in the body, primarily through providing long-term energy storage and assisting in the absorption of fat-soluble vitamins. When carbohydrates are depleted, the body turns to stored fats as a source of energy, yielding a higher energy output per gram than carbohydrates or proteins. This makes fats an excellent medium for long-term energy storage.

Additionally, fats are essential for the absorption of fat-soluble vitamins, such as A, D, E, and K. These vitamins require fat for proper absorption in the digestive system, making dietary fat a vital component of a well-rounded nutrition plan. As a result, adequate fat consumption is important not just for energy, but also for maintaining overall health through nutrient absorption.

The other choices focus on more immediate functions or roles that fats do not primarily fulfill. For example, while fats can support brain health, their role in energy storage and vitamin absorption is more foundational.