Vitamin A: An Overview

Vitamin A is a fat-soluble vitamin that plays a crucial role in various bodily functions, including vision, immune system function, and cell growth. It exists in two forms: retinoids (preformed vitamin A) and carotenoids (provitamin A). Retinoids are found in animal products, while carotenoids are found in plant-based foods.

Sources of Vitamin A

Some common food sources of vitamin A include:

• Liver
• Egg yolks
• Milk and dairy products
• Carrots
• Sweet potatoes
• Spinach
• Kale

Functions of Vitamin A

Vitamin A has several important functions in the body, including:

• Supporting vision and eye health
• Promoting immune system function
• Supporting cell growth and differentiation
• Playing a role in reproductive health

Deficiency and Toxicity

A deficiency of vitamin A can lead to a range of health problems, including night blindness, increased susceptibility to infections, and poor growth. On the other hand, excessive intake of vitamin A can lead to toxicity, which can have adverse effects on the liver and bone health.

Study Guide for Vitamin A

Here are some key points to remember about vitamin A:

1. Vitamin A is essential for vision, immune function, and cell growth.
2. It is found in animal products as retinoids and in plant-based foods as carotenoids.
3. Deficiency can lead to night blindness and increased susceptibility to infections.
4. Excessive intake can lead to toxicity and adverse health effects.
5. Include a variety of vitamin A-rich foods in your diet to ensure adequate intake.

Remember to consult with a healthcare professional or a registered dietitian for personalized advice on vitamin A intake and supplementation.