Discusses the amount of bread one is required to consume in order to be obligated to recite Birkas Hamazon. All other food-related shiurim are tied to the shiur of a kezayis; however, regarding Birkas Hamazon, the Torah mentions explicitly eating and feeling satisfied - "Ve'achalta ve'savata". Therefore, there is a discussion as to whether less than a kezayis would suffice if one does feel full after eating, or whether one is required to recite Birkas Hamazon after eating a kezayis or more, even though he does not feel full.

This discussion also comes up in Parshas Bechukosai, regarding the pasuk "Ve'achaltem Lachmechem L'sova". Chazal explain this Bracha to mean that one would only need to eat a little, and would still feel full. This brings rise to the discussion amongst the poskim - in such an instance, would he be obligated to recite Birkas Hamazon?