I had a gastric bypass Jan. 09, my highest weight was 547 pounds and I was 481 the morning of surgery. Right now I weight 190 pounds (my lowest was 180) but have an incredible amount of loose skin all over my body. I am worried about my weight getting too low without realizing it so I would like to have a resonable estimate of what the excess skin weighs in order to figure out my appropriate target weight. What is the best way to figure this out??