Fasting Before the Wedding
Because the bride and groom are starting a new life together, their wedding day is considered to be a personal Yom Kippur for each of them. For this reason, it is customary to add the Yom Kippur confessional to their private afternoon prayers. This is also the reason why many couples fast on the day of their wedding. While there is a strong custom for both the bride and groom to refrain from eating and drinking on the day of their wedding, there is some leeway. If either feels weak or ill from fasting, they are permitted to eat. And, if it is the first day of the new month, the day after a holiday, or a holiday such as Chanukah, we are prohibited from fasting.
*Please note that fasting is an Ashkenazi practice and is not generally part of Sephardic tradition.