Vitamin D

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

Sources of Vitamin D

The primary source of vitamin D is sunlight. When the skin is exposed to sunlight, it produces vitamin D. Other food sources of vitamin D include fatty fish (such as salmon, tuna, and mackerel), cheese, egg yolks, and fortified foods (such as milk, orange juice, and cereal).

Functions of Vitamin D

• Promotes calcium absorption in the gut
• Supports bone health and strength
• Regulates immune function
• Supports brain and nervous system function
• Regulates insulin levels and supports diabetes management

Deficiency and Health Implications

Vitamin D deficiency can lead to a range of health problems, including rickets in children, osteomalacia in adults, weakened immune system, increased risk of cardiovascular disease, cognitive impairment in older adults, and increased risk of severe asthma in children.

Study Guide

1. What are the primary sources of vitamin D?
2. List three functions of vitamin D in the body.
3. What health problems can arise from vitamin D deficiency?
4. Why is vitamin D important for bone health?
5. How can individuals ensure they are getting enough vitamin D in their diet?