purple sky, i think you were right, bigger/over weight women tend to try to diet and watch what they're eating, therefore they are unconciously eating less calories and less variety of foods.
For me i thought doing the girl diet means no fruits/vegs/salt/high sodium sauces/chili, etc that is alkalinizing but there's a lot of other stuff i have to watch out and i never knew about it. Prior to DS conception i ate salad religiously and was pretty much like a walking "IG ttc boy diet" although i didn't know what swaying was.
I will try to see how I go as I am slowly weaning DS off breastfeeding. It's just that I always have big appetite and i love food so much. The thing that I like from the girl diet, particularly IG diet is that I get to eat more empty carbs (does not mean A LOT)and little fruits/vegs.... which i think it's an easier maintenance for me since I have soooo little time these days. BUt the only problem i have is that i have to eat until i feel FULL then I will stop. Must change this behaviour.