I checked on Google and got 0 responses so if the spelling is right it looks unlikely they are still around.

I remember Limmits.

I think they have been superceded by all the other slimmings systems that you can get now. A biscuit in comparison to say, all the Heinz Weight Watchers products, probably wouldn't stand an earthly these days when, a few decades ago, they were virtually the only game in town.

One thing I do remember though, is that they had one vital ingredient in common with something else that was very popular at the time. It may or may not have been called Celugar but it was also prevalent in Wallpaper Paste!