Water Kefir and diarrhea

Hi guys. I've been making water kefir for about a little over a week now (I already have an overflow of water kefir grains) and each time I made a batch, I took a few sips of the water kefir, then discarded the rest (I was mainly just trying to get good grain growth first).

Anyway, today was the first time I actually consumed more than a few sips. I took half a cup of water kefir that had been fermenting for 3 days with an additional 1 day of secondary fermantation (after draining off the kefir grains, I just left the bottled water kefir in the fridge for 1 day).

I just had a bout of diarrhea (which isn't common for me) and I wasn't sure if this was related to the water kefir I drank. My diet definitely hasn't changed. I remember reading somewhere that your body has to become used to kefir first so you should introduce the kefir slowly which was why I took some sips for about a week before consuming half a cup. Could it be that the jump from a few sips to half a cup was too much? Has anyone else had experience with water kefir causing diarrhea?

Thanks

hi cherchez. could it be you are unable to tolerate any excess unfermented lactose? how long have you been taking kefir?