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A fast is a period of abstention or self-denial. For most fasts, there are no set rules on when to start or how long they should last. Your own instincts are usually your best guide.
A fast can be from traditional things like 3 solid meals, from social media like Reddit, Instagram or Facebook or even quitting smoking for a day.
The great comedian, Ed Wynn said, "Without your health, riches, possessions and fame are all mud."
With the high costs of health care, how can we afford not to keep ourselves well? Most fast for health, self-discipline and preparation and not for religious reasons. Perhaps no subject is less understood by the public and the "healing" professions than this oldest of means of caring for the sick body.
Civil discussion is welcome, trolls and personal abuse are not and please use search before asking a question that has been asked & answered already. Presenting opinions as facts is not what /r/fasting is about. Please frame beliefs as such or back them with hard data (i.e. from pubmed, etc.). Violators will get 1 warning prior a ban.