Probiotics are just live bacteria, usually ones already found in your gastrointestinal system but sometimes "new" ones, that can help you digest food or protect against bad bacteria/fungi. unless maybe you had some sort of bacterial imbalance right now, and eating these products corrected it. I can't think of a way that they would help you lose weight (I'm a biochemist, but with very little experience in human biology) unless you had some imbalance now and didn't know it.
That said, I've heard of plenty of people saying that probiotics improved their digestive health, even when they didn't think they had any problems to begin with. So maybe it's worth a try! I do eat yogurt nearly every day, and I've tried yogurts that are supposed to have more/different probiotics, but I never felt a difference compared with days/weeks when I don't eat it. *shrug*
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