LEM, I agree that underweight women and those with unhealthy diets etc.. would be unwise to ttc and of course there are some healthy overweight people etc..
I don't agree with stopping anyone from having a child if they want one. I mean how the hell would you stop them , for a start. I just think it's a matter of encouraging people to think a bit more before falling pregnant. Obesity is soaring in this country and it's scary, this is the first generation of kids expected to die at a younger age than their parents as a direct result of obesity and it's very worrying. The more we stick our heads in the sand and defend it the worse it will get.
Correct me if I'm wrong but even if you have the obesity gene doesn't it have to be triggered by environmental factors?. Therefore if you ate healithly and in reasonable amounts (I'm not talking American portions here) + kept fairly active you would keep within a healthy weight-range..An d if your baby had it, as long as you gave them nutritious food they would be fine (unlike that ridiculous program the other night where they were constantly fed chips - but I take that with a pinch of salt)
Kiddiz, I don't think the OP meant people who were a bit fat, quite podgy, overweight or even obese. She referred specifically to the morbidly obese due to the health implications that they very likely have and or may pass on.
As for losing the weight, sadly I think like anything else that's worth doing it's hard work and you have to want it badly enough...
Phew, apologies for the length