I was just south of 400 lbs when I realized that I had to do something. I have started Keto, I made a post on it also. I have done well so far. It has been around a month or so now and I have lost about 30 pounds. With all my knee and other problems, it was hard for me to walk a lot. My knees hurt like crazy when I walk but I think if I can start out slowly and build up the strength in the knee that has had five operations on it, it will be much better.
Congrats man, keep it up! Great Job!