Five Pillars of Islam
Muslims all over the world, observe fasting from sunrise to sunset, during the month of Ramadan (Ninth month of the Islamic calendar), every year.
Besides completely abstaining from many Lawful (Halal) things such as eating, drinking and getting intimate with spouses during the fasting hours, they also avoid loose talk or harsh words during their fast.
The elderly, the sick, travelers, nursing mothers, pregnant women and women during their menstrual cycles are exempt from fasting. Those who can compensate their missed fasts after becoming normal, should do so, later.
Fasting is an exercise to gain self control.
A light pre-dawn meal (Sahur) is highly recommended.
Following the tradition of the last Messenger of Allah, Muhammad (Peace be upon him), Muslims break their fast with palm-dates or water.
Breaking fast without any valid reason is a great sin and its penalty is to keep fast for 60 days continuously, or feed 60 people.
God had prescribed fasting for all the other religions before Islam, but they have either forgotten it altogether or have reduced it to mere symbolism.