Why do Hindus fast? What is a vrat?

A vrat is a vow: a religious observance kept for a day or longer, which often includes a fast. People keep vrats out of devotion, as a discipline, in thanks for a wish granted, or with a prayer for their family. A fast can mean no food at all, one meal, fruit and milk only, or no grains. Common vrats are Ekadashi twice a month for Vishnu, Maha Shivaratri and Pradosh for Shiva, the nine nights of Navratri for the Goddess, and Karwa Chauth, kept by many married women. Each vrat has its rule, its story (katha) and its time to end the fast. The Gita warns against extremes (6.16).

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Vaishnava (Ekadashi)

For Vaishnavas the chief vrat is Ekadashi, the eleventh day of each half of the lunar month. Grains are not eaten, the day is spent in prayer and the names of Vishnu, and the fast is broken the next morning within a set time (parana). Vaikuntha Ekadashi, in the month of Margazhi, is the most honoured of them in the Vishnu temples of South India. When Ekadashi spans two days, Smartas and Vaishnavas may keep it on different days.

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Shaiva

Shaivas keep Maha Shivaratri with a fast and a night of worship, offering water and bilva leaves to the linga through the four watches of the night. Many also keep Pradosh, at dusk on the thirteenth day of each lunar half-month, and the monthly Shivaratri. A well-known Shivaratri story tells of a hunter who, without knowing it, kept the vigil and the fast.

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Shakta and household vows

Shakta families fast through the nine nights of Navratri, in spring and autumn, often eating only fruit or one meal and ending with the worship of young girls as the Goddess. Many married women keep Karwa Chauth from sunrise until moonrise, for their husbands' long life, as the vow's own story says; others keep it in other ways or not at all. Before the evening prayers, the women of the house often gather to hear an elder woman or a priest tell the vow's story (vrat katha).

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Bhagavad Gita and the epic (moderation and rule)

The Gita asks for balance: yoga “is not his … who eats too much, nor his who eats not at all”, but belongs to one “who takes due food and exercise” (6.16–17, Telang). In the Mahabharata, Yudhishthira remarks that people of every order keep fasts and asks why; Bhishma answers with the teaching of the sage Angiras on fasts kept by rule. Here fasting is a vow kept by rule, with set limits.

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Checked against the sources listed, October 13, 2026.
Updated
October 15, 2026

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