What will be the effect of vitamin d deficiency?

Bone loss: Vit D is essential for the absorption of calcium into your bones. A deficiency will lead to bone loss and eventually osteoporosis later in life. There is also research in Vit D's role in preventing certain cancers, reducing blood pressure, diabetes, rheumatoid arthritis, multiple sclerosis, Alzheimer's disease and even helping the immune system to fight off influenza and the common cold!