I think there is some truth to the apple/pear thing but of course not going to work across the board. I am curious to take the "bagel test". I read about it in Women's Health magazine. I suspect I am pretty carb tolerant (I am a pear) as for many years I ate a very high carb diet and don't recall having any of the problems people who are intolerant report. Now I eat much more protein/good fats (and even more so now that I am doing NROLW) and some days I don't even get up to 40% carbs and wondering if this is hindering me.
A fear years ago I tried South beach diet. The first two weeks (which is almost no carb, just veggies) I barely lost anything. Then in the next two weeks where you can have fruit/grains I lost weight and lots of inches. I suspect my body needs more carbs.
Bagels are one of my all time favorite foods (REAL bagels, not those stinkin blueberry/french toast/chocolate "muffins" that pass themselves as bagels)

SO yeah, I think I need to take the test hehehe