I used it for 6 weeks and didn't gain weight at all, but here's the trick: mix it with prune juice when you take it! 4oz of prune juice, 1 packet--shake & drink. This adequately combats the constipation everyone warns about
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One thing I did notice is that my belly felt bigger and gassier when I was on it. I did end up wearing slightly baggy tops so I'd feel more comfortable.
For what it's worth, I've had 5 kids, I'm in my 40s, and I'm at my pre-baby weight, too.
I understand. Feeling confident in one's size is essential!