Rabbinical law prohibits eating at certain times even on non-fast days, such as prior to daily morning prayer, prior to the recitation of kiddush on Shabbat or Yom Tov, and between the ending of Shabbat and Havdallah. In particular, these laws are to strictly be followed by adult males and should be followed by adult females who are not pregnant or nursing. While it is optimal to wait out these shorter periods of time rather than eating, even for one whose medical condition demands frequent eating, there are exceptions: