Fasting from food and drink has been practised by social activists throughout human history:
Gandhi frequently engaged in fasting and integrated it into his political activism, combining it with other forms of direct action, for instance in response to the Rowlatt Acts in 1919, as well as for unity and an end to violence.
Abdul Ghaffar Khan (aka Badshah Khan), an activist who raised history's first "non-violent army", had fasted for similar reasons to Gandhi. Once after having eaten nothing for several days and sipped only creek water at night, he began to feel an inner strength that he had never previously experienced, and was consequently transformed.
Spiritual traditions: Fasting can be an important component of spiritual traditions, for instance in Judaism (especially on Yom Kippur), Christianity (particularly during Lent), and Islam (especially in Ramadan); also Buddhists may abstain from food as an aid to meditation.
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In addition is the Vision Quest, a rite of passage that has been used in certain indigenous cultures in North America and has also been adapted for use by other groups. The quest, which usually works as a twelve-day ritual can include four days of fasting whilst alone in nature. The purpose of the quest is at least in part to help connect an individual to an inner quietness and wisdom that they are then able to draw on as they return to community life.
More information about the purpose behind Fast for the Planet can be found by visiting the concept page.