During the 9-day Navratri fast, focus should be on sattvic and light food like milk, paneer, yoghurt, kuttu, rajgira, sabudana, fresh fruits, and vegetables. Use rock salt instead of regular salt. Avoid onions, garlic, non-veg, lentils, regular grains, junk food, processed snacks, aerated drinks, and alcohol to maintain energy, digestion, and spiritual focus throughout the festival.