What do fats act as in the body?

Fats serve as a secondary fuel source and energy reserve in the body. When the body requires energy, it will first utilize carbohydrates for quick energy needs; however, when those stores are depleted, it turns to fats. Fats are stored in adipose tissue and can be metabolized to provide energy, especially during prolonged physical activity or when carbohydrate intake is low. This process allows the body to maintain its energy levels over longer periods.

Fats also play a critical role in various physiological functions beyond energy storage, including the absorption of fat-soluble vitamins and providing essential fatty acids that are important for cellular health. Their storage capability and availability when energy from other sources is low highlight their function as a reserve energy source.