I see a lot of "this food stalled me" or "Aspartame STALLS, avoid it!" and my question is:

How do you KNOW that's what caused the stall? I know I don't have the patience to introduce ONE food in, say, 2 weeks time or even more, document my loss pattern, any changes and such, then move on to ONE more new food, etc...can someone point me at a conclusive study?

IMHO, unless you isolate one food or substance at a time, there would be no way of knowing in such certain terms that it was that packet of nutraweet or maybe a natural pause in your weight loss.

It's not just nutrasweet and sweeteners, but I'm just also curious about how people go about nailing the right culprit?