You know, my experience as a (previously) pregnant woman gave me great insight into what it feels like to carry around a bunch of extra weight and what it does to the body. Including the baby, the fluids, the placenta and the extra fat, in 9 months my body was carrying around an extra 50 lbs. The havoc that reeks on a body is phenomenal. When I was stationary, I breathed like I was trying to run a marathon. My heart would be pounding 3 times faster than it normally does (which when your stationary is quite startling) When I would lay in bed I could HEAR my blood pounding trying to get through all of my body fast enough. Walking was painful. My back hurt. OMG my knees felt like they were going to pop everytime I sat down. All I could think about was this is what extremely overweight people feel like all the time. And then suddenly it was gone. Literally overnight my knees felt almost 100% whole again. I could lay in bed without weezing. I could get up and down at a normal speed again and not feel like I just broke my body.
My point is because it happened from one extreme to the other for me (people that are over weight don't lose 20 pounds in 3 days) I was able to really see how much it affected my body. I mean you hear about it constantly: overweight people are at high risk for heart problems, diabetes, joint problems, back problems. But to go from extreme pain to extreme relief so quickly it really makes you realize just how much better it is to be a healthy weight.
/rambling