Who washes and Bentches but does not eat?
closed as not a real question by Isaac Moses Jun 16 '11 at 22:09
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Having thought more about this. I decided that based on the Yiddish meaning of Bentching, everyone who is old enough to say Asher Yatzar does. Because you wash and then bentch Asher Yatzar. I am leaving my original answer as well.
Everyone who follows the rulings of the Ben Ish Hai who says to wash ones hands and make a Berakha on besamim before each of the three prayer services(actual source in sefer Ben Ish Hai, and its derivative from Sha'ar HaKavvanot to follow once I look them up).
Does drinking count as eating? There is certainly an opinion that one bentches birkat hamazon after wine, and I think there is an opinion to wash before wine, certainly terumah in days of bais hamikdash