Vitamin A

Vitamin A is a fat-soluble vitamin that is essential for maintaining good vision, a healthy immune system, and cell growth. There are two main types of vitamin A: retinoids and carotenoids.

Sources of Vitamin A

Retinoids are found in animal products such as liver, fish, and dairy products. Carotenoids, on the other hand, are found in colorful fruits and vegetables such as carrots, sweet potatoes, spinach, and kale.

Functions of Vitamin A

Vitamin A plays a crucial role in maintaining healthy vision, especially in low-light conditions. It also supports the immune system by helping the body fight off infections. In addition, vitamin A is important for the growth and development of cells, including those in the skin and mucous membranes.

Deficiency and Toxicity

A deficiency of vitamin A can lead to night blindness, increased susceptibility to infections, and dry, rough skin. On the other hand, excessive intake of vitamin A can lead to toxicity, which can cause symptoms such as nausea, dizziness, and even liver damage.

Study Guide

1. What are the two main types of vitamin A? Explain their sources.
2. Discuss the functions of vitamin A in the body.
3. What are the potential consequences of a vitamin A deficiency?
4. What are the risks associated with excessive intake of vitamin A?