babysmith's Losing Weight Wish

I am 25 and have been married for almost 5 years. Through out my 8 year relationship I have gained 65 pounds. My husband still loves and is extremly attracted to me. So I'm not losing it for him but for me because I feel that it is benifical to my health and the possibility of conceiption. Within the next year I really need to loose 45 pounds. I currently weigh 185 pounds but I would really like to be between 135 and 140 pounds. Please help me to acheive my ideal goal.