Dr A suggests that we not use aspertame as it can lead to stalls in many people, but can anyone tell me how long it would take for this to show up?

eg, My husband had an aspertame-flavoured soda the other day - he is still losing about 1 lb per day (sometimes more), but how long would it take for stalls to show up? Can he continue the odd "fix", and just wait and see?

I'm concerned about the aspertame in my sugar free jello (about 1 portion every 2-3 days), and I would one day like to be able to drink diet coke in moderation (like when we go out - I don't want to be on water forever!)

Any advice is appreciated.

Thanks
Dawn