Welcome to Sparkpeople and the cycling forum as well. I am a teacher as well and toward the end of my weight loss journey. I am 10 pounds from my goal. The last 10 is taking a long time in coming, but the most important part of this journey is that I have kept it off for a few years now and I am even now off all of my blood pressure meds and everything. Hang in there. You can do it. Think of what an inspiration you will be for both your family and your students.