I've heard about this a lot, particularly as an old, old WW plan, but I can't find what it is. I've Googled but I get all kinds of funny stuff about international economics so I think it's one of those things that you need to know what it is in order to create the correct search to find out what it is!
What do you exchange for what? Or is that just a name? My diabetic friend works with "exchanges" but he can't seem to explain it except in terms of what he has to put in his insulin pump so I'm not sure if it's even the same thing, but it is to a certain extent about carbs.
Can someone either point me to a link or overview what an exchange plan is/does?
thanks!