I was very ill with my last child, in fact I was in the ER for IV fluids several times. I lost about 30lbs durning my pregnancy. I continued to be ill for the following year, very unpleasent. I lost 70lbs in total! Not a great way to diet and in fact I still have some weight to lose. I was a very heavy gal and now not so much. I would have much rather not been so ill for so long, than weight loss. I did have a very healthy 8lb baby boy, well worth it all!
My heart goes out to anyone with Morning sickness.