Thanks for your concern, but I'm doing quite well on alli, with no side effects. The message boards rarely hear from satisfied users such as myself!
I have always had a regular period, on or off The Pill, and I continue to have a regular period while taking alli. My sister just started menopause a few years ago and hadn't had a period for over a year and got one on the same day I started taking alli. She's not taking alli--and she didn't even touch one of my pills--Go figure! Personally, I don't know anyone who went through menopause and didn't have a number of unpredictable periods...As for missed periods and spotting--a lot of women these days are on low dose oral contraceptives that are much less forgiving if they are not taken at the same time each day/or taken every day.
I feel GREAT since I've started the alli plan! I'm eating healthy meals and learning appropriate portion sizes. Of course, I also haven't decreased my fat intake to zero or cut my calories down to near-anorexic levels, either (factors which definitely DO have a proven effect on menstruation). If you don't want to take alli, that's your choice and you're entitled to it. But there are a lot of women who can benefit from it and, if they give it a chance and don't go seeking problems, excuses and complaints, it will definitely work for them.