Not convonced on the FF nd obesity link so far. Certainly in real life my experiences don't bring this conclusion.
For example, I was breast fed - I am short and have a tendancy to put on weight. Why? partly my shape inherited from my dad's side of family, and mainly as I like to eata nd drink too much and don't exercise as I should!
My brother was FF due to medical reasons. He is stll below average height but very slightly built. He has my mum's family shape and he also doesn't eat that much, does loads of exercise and does't really drink much.
My sister was breastfed longer than I was. She is tall and thin. She has the same shape as a couple of my auntis on my mum's side and is very careful with her food intake.
I personally think the main reason for rising obesiity is that we all eat too much, and exercise too little. Our lifetsyles have changed and we now take in far more calories than we use up.