The advice did not come as a surprise, as once while talking to very senior consultant in infectious diseases, on why Indians who come to live here are more susceptible to tuberculosis, he said Indians are used to more and regular intake of Vitamin D and darker skins require more of it, so when they migrate here the body cannot adapt to the lack of sunshine and the immune system begins faltering. Vitamin D helps to increase the amount of good immune proteins that fight and destroy bacteria. People with low levels of Vitamin D are more likely to develop dormant tuberculosis, and are also more likely to progress to active tuberculosis. Having high levels of Vitamin D may be a way to help prevent tuberculosis infection, but more experiments need to be done to say for sure. And, as he informed that since a large proportion of Indians are vegetarian, it accelerates the process.