Originally Posted by nonegiven

There was a dramatic difference in my BGs before I lost much weight. Even though being fat adds some IR, high levels of insulin in the blood adds a lot.

I do think a 300 lb person can get away with eating more carb than a 150 lb person because they have a higher blood volume. The larger person will have more total glucose in their blood than the smaller person when they have the same BG#. This means that the amount of carb a person can tolerate will decrease as they lose weight.