OH MY GOSH!!!!!!!
I have had the most HORRENDOUS acid/heartburn today, so bad I was in a cold sweat and at one point thought I might be sick!
It started last night, but I didn't start with my packs till today!
Did a bit of research and have narrowed it down to the water flavouring! I was so impressed with it last night I had about a ltr of water with only a little bit but the indigestion started almost straight away.
May be an individual thing but thought I'd share my experience.
On the plus side...loving the shakes!!! I had one tonight in a pint glass with lots of ice....it certainly soothed the 'fire in my belly'