Well, let this be a lesson to me re: gum. Asked the same question as you the other day (on day 3 of water fast) and got caring replies, all to the effect of 'don't chew the gum!' Well, today, my assistant kept asking program-based questions and, fearing that I might kill her w/ faster breath, chewed Sugar free gum every time I walked to her desk.
10 minutes ago,I vomited up pink (so very pink) watery-bile.
Lovely. Looks like in this instance, my body is more committed to cleansing than my mind!