India, Sept. 20 -- Vitamin D is a fat-soluble micronutrient that helps the body absorb calcium and phosphorus to strengthen the bones and the immune system. The best source of the nutrient is sunlight exposure, which triggers its formation in the skin.

However, modern indoor lifestyles often leave one lacking in this regard, leading to a deficiency. Taking to Instagram on September 19, Dr Kunal Sood, a Maryland-based physician in anesthesiology and interventional pain medicine, listed five signs that can suggest that one is running low in vitamin D. They are presented as follows.

As the nutrient plays an important role in maintaining bone health, severe deficiency can show up as unexplained bone pain, shared Dr Sood. In his words, "Seve...