Hey Patrick forget about weight loss and focus on building your core so you can support your upper body without putting weight on the front bars you'll probably shed any unnecessary extras on the way but the riding result will be great. I once heard Nicki Hayden say that we can't see how much they use their legs on a bike and learned a whole new stlye from that comment. Heaps of times I hear comments that people get sore wrists and wonder if its because they are leaning on the bars , but it could also be the angle of the wrists. 190cm is a decent frame to fit a sport bike.