The yogurt with active bifidus regularis. I’ve had a few lately, and tonight I’m sick as a dog. I suppose it could be a bug going around, but thought I’d better check. Google seems to suggest possible gas, but that is not my problem.
The main difference between Activia and a “regular” yogurt is the marketing. The second biggest difference is the price. The third one, that some varieties come only in one version of the labeling.
Regular yogurts have “bifidus regularis” (or whatever TM each brand has been able to obtain or is trying to obtain in the specific location) as well. If they do not have active bifidus, they can not be called yogurt, at least in some jurisdictions. I don’t know what is the legal situation in the Prairie 
Too much yogurt can be bad for you, same as too much of anything (that’s the definition of “too much”) but shouldn’t cause anything but a bit of gas or a bit too much speed, unless you happen to be somewhat allergic to milk proteins or were clogged to begin with (not even lactose intolerance, as the fermentation of the lactose is what turns the milk into yogurt). My WAG is on a stomach bug; if you find that you have a similar and recurring problem with other dairy products you may need to see your doctor about it.
The Activia yogurts contain inulin, which could be your problem. It’s in a lot of the foods meant to give you more fiber/help with digestion (Fiber One bars, that kind of thing), and can cause gas, diarrhea and cramping for a lot of people. Especially if you eat more than one in a day.
Since I ate two or three over three weeks, I’m thinking it’s a wee nasty bug. Had to cover the bases just in case.
I’ve seen meat and dairy products sitting in the customer service area at WalMart Superstore (the ones with grocery). Even if they had some timer to make sure they don’t sit there for too long, who knows what happened to them between the time the customer bought them and returned them?
Anyway, my point is not to bash WalMart but to indicate that there are many possible ways that one particular yogurt could have gone bad and made you sick, from the various separate ingredients all the way to your fridge.
I don’t know how you even narrow down for sure what made you sick… I felt barfy all day yesterday, and I’m sure it was something I ate. I had skipped lunch, the day before, so do I blame it on the McDonald’s breakfast burrito or the Tuesday Taco special I ate at 6:30pm at the movie theaters?
Dang, you like to live dangerously!
It was one of those crazy-all-day days… go go go!
I started a thread on the how-do-I-tell-what-made-me-sick question so I know if I should avoid that McD’s or that Taco Special from now on
Wow, you can get tacos at your movie theater? I really want a taco now. 
I didn’t mean to hijack the thread, honest :eek:
Maybe this will steer it back:
Anyway as concluded in my other thread, the incubation period is wide enough that you can’t narrow it down to a particular meal, or item such as yogurt, breakfast burrito, or taco 
And even sticking your finger in your mouth to pick your teeth can spread something that you touched and you end up making yourself sick.
If you can eat the yogurt (or tacos 
) without effects on different occasions, then you can probably rule out allergy or bad reaction to ingredients.