How come i get diarrhea from cola now but not in the past?

Ok so i use to drink a lot of coke-cola, lets say 1 liter or so a day. I Haven't had a coke-cola for about 2 months. The other day i had my first cola since then, and after the first or second sip of cola i was feeling like i had diarrhea. My question is why do i get diarrhea from one small cup of cola, where... show more Ok so i use to drink a lot of coke-cola, lets say 1 liter or so a day.
I Haven't had a coke-cola for about 2 months. The other day i had my first cola since then, and after the first or second sip of cola i was feeling like i had diarrhea.
My question is why do i get diarrhea from one small cup of cola, where in the past i could drink like a liter or 2 and not feel anything
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