I am 6'0 and 200 pounds. I was 180 pounds since the age of seventeen, and I always looked good at that weight and felt great too. This year I have put on 20 pounds because my vision was compromised by a retina disease that needed treatment. I was unable to see, so I stayed at home and didn't get much activity, and I managed to gain 20 pounds. I liked how I was at 180, and none of my favorite clothes fit me. I was healthy and felt great then. Now that my disease is cured, I want to lose these 20 pounds. For the past week I've been walking 3 miles per day, and I don't have any commitment problems doing this on a daily basis. My doctor says walking is the healthiest thing for me (I cannot lift weight because of glaucoma risks). Is there a way to effectively get down to my original 180 weight by Christmas time? I know that long term habits must be changed, but it would mean the world to me to accomplish this goal by the holiday. Please help me.