Ramadan, the Month of Fasting
The third "pillar" or religious obligation of Islam, fasting has many special benefits. Among these, the most important is that it is a means of learning self-control. Due to the lack of preoccupation with the satisfaction of bodily appetites during the daylight hours of fasting, a measure of ascendancy is given to one's spiritual nature, which becomes a means of coming closer to God. Ramadan is also a time of intensive worship, reading of the Qur'an, giving charity, purifying one's behavior, and doing good deeds.
As a secondary goal, fasting is a way of experiencing hunger and developing sympathy for the less fortunate, and learning to thankfulness and appreciation for all of God's bounties. Fasting is also beneficial to the health and provides a break in the cycle of rigid habits or overindulgence.
source from here