Q: Do you ever regret for it?
A: *shakes head* Many Jews and Christians fast at different times for different reasons. Islam determines that fasting shall be the entire month of Ramadan, the periods of time for fasting have been different for the other religions. Penticostals fast frequently whenever they are supplicating for things, Catholics and similar sects have a semi-fast for Lent each year. Jews frequently fast throughout the year as Muslims do.