Which vitamins are classified as fat-soluble?

The classification of vitamins into fat-soluble and water-soluble categories is based on their solubility characteristics and how they are absorbed and stored within the body. Fat-soluble vitamins include vitamins A, D, E, and K.

These vitamins are absorbed along with dietary fats in the small intestine and can be stored in the liver and fatty tissues. This storage capability allows them to be utilized by the body as needed, but it also increases the risk of toxicity if consumed in excess, as the body does not excrete them as readily as water-soluble vitamins.

Vitamin A is crucial for vision, immune function, and skin health. Vitamin D plays a vital role in calcium metabolism and bone health. Vitamin E functions as an antioxidant that helps protect cells from oxidative damage, and vitamin K is essential for blood coagulation and bone health.

The other groups listed in the other choices contain vitamins that are classified as water-soluble, such as the B vitamins and vitamin C, which are not stored in significant amounts in the body and must be replenished more frequently through diet. Thus, the correct identification of vitamins A, D, E, and K as fat-soluble underscores their unique physiological roles and management within the body.