Rav Schachter quotes the Avnei Neizer that we know how big an olive is. An olive is the average olive (not like the Tzlach), and this is certainly an opinion that a Zaken or Choleh can rely on. Opinions range anywhere from 11 to 28 (maybe even 33) grams. If you are going to eat 28 grams, though, make sure you eat at least 11 grams within 2 minutes.
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