I think that is one of the reasons Atkins states to make sure you follow the carb ladder, or at least just add one new food in at a time. That way you have time to see how your body reacts.

It also takes some experimentation and just learning to read your body. I found out cream stalled me by reading the signals my body gave me more then the scale. When I had cream I would instantly crave more. Even if I was full having some cream as a dessert would make me want to eat more. Weight loss wasn't as good of an indicator because it was anything but steady normally. I had ups, downs and flat lines on the graph.

Eliminating the majority of foods form your diet then slowly adding them back in is a great way to see what foods you are sensative too and what can stall you.

i can tell something stalls me because every night when i go to sleep, i am one pound above what i was that morning. And when i wake up the next morning i am one pound less than when i went to bed. So i always loose one pound overnight. If i eat something with aspartame in it, i dont loose that pound at night.. its like it messes up my metabolism and i will gain a pound.