Can anybody please answer the question (or have an opinion) regarding what the acceptable GI or GL levels are per day while being in the weightloss phase?

I've been reading to minimize the GI and GL levels in the food I eat. Also, if I remember correctly Montignac talks about eating until you're satisfied (as long as the food is low in GI).

However, I have the feeling that there must be some other guideline regarding what the max. allowed GL is per day (in the weightloss phase). Does anyone have an answer/opinion regarding this?