Problem with activia yogurt ?!
Answers:
Some people have this problem with Activia, including my mother who is slightly lactose-intolerant.
"Activia contains a probiotic given the trademarked name of Bifidus Regularis in the US and Bifidus Digestivum in the UK. The bacteria's scientific name is Bifidobacterium animalis DN-173 010 and Dannon's research has proven it shortens the colonic transit time in healthy women."
Googling around a bit it seems like a lot of people have the same reaction to it as you.
Try drinking Kefir instead.
http://en.wikipedia.org/wiki/Kefir
Not likely that it was the Activia. You probably ate something that disagreed with you OR may have had a bug.
Montezumas Revenge!!!!!!!!!!!!!!!!!!!
you may be lactose and tolerant