A prominent festival for the North Indian state of Bihar and certain regions of Uttar Pradesh and Nepal, Chhath Puja rituals start on the sixth day of Hindu calendar month, Kartika.
The grandest festival for those who observe it, Chhath Puja is also a stringent one that encourages frugality and abstinence from food and water.
Some say Chhath Puja also has roots in science as it helps the human body get rid of toxicity. Taking dips in water and exposing oneself to the Sun increases the flow of solar bio-electricity that improves the overall functionality of the human body. Some also believe that Chhath Puja helps eliminate harmful bacteria and viruses from the body–thus preparing one for the onset of the winter season.
Thus it is believed that following the practice of Chhath Puja has alot of health benefits.