If you are trying to improve your nutritional health then education on Vitamin D is important and a good place to start.
It is likely the most underrated nutrient in mankind in regards to nutrition.
The health benefits of it are plenty.
It is known to prevent the following:

• Cancer
• Diabetes
• Obesity
• Depression
• Osteoporosis
• Prostate and breast cancer

The reason more people are not aware of the importance of Vitamin D is because of the Drug Companies.
There is no profit in touting something that people can get for free.
It comes in the sunshine and can't be sold, though people are trying to with tanning salons.
Here is a list of things you should know about Vitamin D

• It is fat soluble and is stored in the body
• The UV ray that produces Vitamin D can not go through glass
• Vitamin D is produced by your skin from sunlight
• It's almost impossible to get Vitamin D in your diet
• You would have to drink more than 10 glasses of fortified milk daily to get minimum amount of Vitamin D
• The only reliable way to get Vitamin D is in sunlight
• People with dark skin may need up to 30 times as much light exposure to get same amount of Vitamin D
• Because Vitamin D is so hard for black skinned people to get through sunlight it answers why black men are more prone to prostate cancer
• It takes months to go toxic with Vitamin D
• It takes months to rebuild loss Vitamin D
• The weakest of sunscreens will still block by 95% your body's ability to generate Vitamin D
• A sign of chronic Vitamin D deficiency is pain when pressing on your breast bone (sternum)
• Vitamin D needs to be activated in the liver and kidneys before you can use it
• Without Vitamin D your body renders Calcium supplements useless

Education on Vitamin D is important! The above interesting facts about Vitamin D surely makes you want to get out and walk in the sunlight.
Knowing your body and how it works will help you be more able to bring it to full well being.