Sunlight is an important source of Vitamin D. Some non-vegetarian foods like fish and eggs also contain this vitamin. Vitamin D helps in improving the health of bones. The vitamin is required by our body for the absorption of calcium. A person who has a deficiency of this vitamin has a high chance of suffering from rickets. Such patients have soft bones. Vitamin D protects you from many diseases. The vitamin helps in improving health. Its deficiency can lead to cardiovascular disease and dementia. We will tell you about some diseases caused by Vitamin D deficiency. Following are the 5 illnesses caused by Vitamin D deficiency.