There are religious faiths in which fasting was practiced long before islam ever appeared on the scene. Fasting was practiced in Buddhism, Hinduism, and even christianity centuries before mohammed.
That aside, knowing that fasting is beneficial does not in any rational way prove any religious text. We can observe and experience benefits of fasting without the need for miraculous explanations.
Blogging Theology 
There are religious faiths in which fasting was practiced long before islam ever appeared on the scene. Fasting was practiced in Buddhism, Hinduism, and even christianity centuries before mohammed.
That aside, knowing that fasting is beneficial does not in any rational way prove any religious text. We can observe and experience benefits of fasting without the need for miraculous explanations.
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