Why is 'Lauki-Bhat' eaten on 'Nahay-Khay'?

On Nahay-Khay, devotees observing the Chhath fast consume sattvic food, traditionally lauki-bhat (bottle gourd and rice). Patna-based astrologer Dr Shripati Tripathi explained that eating bottle gourd has both religious and scientific significance. It helps prevent dehydration and replenish essential nutrients before 36-hour waterless fast. This diet keeps the body light and aids digestion.