Acharya Prashant clarifies the fundamental difference between 'Vrat' (vow) and 'Upvas' (fasting/nearness). He explains that 'Vrat' is a mental resolution or a vow born from the ego, where one pre-determines their actions to fulfill personal desires. Vedanta and sages like Ashtavakra suggest being 'Avrati' (without vows) because such resolutions often strengthen the ego rather than diminish it. In contrast, 'Upvas' literally means 'to sit near.' It signifies the mind sitting near the Soul, much like a disciple sits near a Guru. It is about being established in one's center and has no intrinsic spiritual connection to the mere act of abstaining from food.