Vitamin D

Vitamin D is a fat-soluble vitamin that is essential for the maintenance of healthy bones and teeth. It also plays a crucial role in supporting the immune system, brain, and nervous system function.

Sources of Vitamin D

• Sunlight: The body produces vitamin D when the skin is exposed to sunlight.
• Fatty fish (such as salmon, mackerel, and tuna)
• Cod liver oil
• Egg yolks
• Certain fortified foods (such as milk, orange juice, and cereals)

Functions of Vitamin D

Vitamin D helps the body absorb calcium and phosphorus, which are essential for maintaining strong and healthy bones. It also regulates the immune system and supports overall health and well-being.

Deficiency and Toxicity

A deficiency of vitamin D can lead to bone disorders such as rickets in children and osteomalacia in adults. On the other hand, excessive intake of vitamin D can lead to toxicity, causing symptoms such as nausea, vomiting, weakness, and kidney damage.

Recommended Intake

The recommended dietary allowances (RDAs) for vitamin D vary based on age and gender. For example, the RDA for children aged 1-18 years is 600 IU per day, while for adults aged 19-70 years, it is 600-800 IU per day.

Study Guide Questions

1. What are the sources of vitamin D?
2. What are the functions of vitamin D in the body?
3. What are the potential health effects of vitamin D deficiency and toxicity?
4. What are the recommended dietary allowances for vitamin D?