“An estimated 1.6 billion Muslims are observing their religion’s most sacred month. A primer for the uninitiated”. Source: 9 things everyone should know about Ramadan – Salon.com
Then there are the Alevis Beliefs and Practices:
Fasting – Alevis fast in the first 12 days of Muharram (the first month of the Islamic Calendar, marking the murder of Prophet Muhammad’s (PBUH) grandson, Hussain). In addition to giving up food and liquids till sunset (not strictly adhered to by all Alevis), the days of fasting are also meant to be a time for sacrificing other comforts and pleasures, as an appropriate symbol of mourning. Alevis may also fast from February 13th to 15th (Hizr Feast).