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Wasn’t it taught by Reish Lakish that one who eats gluttonously on Yom Kippur is exempt from liability for violating the prohibition of “… that shall not afflict…”
Our daf’s conclusion is clear; namely, one who eats gluttonously on Yom Kippur does not violate the prohibition against eating on Yom Kippur, because gluttonous eating is not defined as eating.
Tosafos answers (3) that there are two types of gluttonous eating; the more severe type of gluttonous eating is when one is full to the point that the thought of additional eating is reviled. Eating under this condition is not defined as eating, as implied by our Gemara.
The less severe form of eating, which is defined halachically as eating, is when a person is not interested in eating because he is full but has not yet reached the point that the thought of eating makes him ill.
These guidelines are cited by Mishnah Berurah which rules that if a person eats when feeling full he is still obligated to make a beracha before and after he partakes.
If, however, he is full to the point that food appears disgusting he does not make a beracha before or after eating, since that act of gluttonous eating is not defined as eating.
We explore the halachic parameters of eating the Afikomen when full and the notion of gluttony.