I'm happy to have stumbled upon this thread, I too am trying to loose body fat, a lot of it. I am currently at 252, 5'9" and according to the BMI I should be 168 to be in the normal range.
I realize that the BMI does not make a lot of sense so I am realistically shooting for around 180lbs and I will figure it out from there if I should loose more.
When I started loosing I was at 274, back in August and recently it has been very slow going, I have been hovering around 250. But I am going to keep going at it. I am keeping track of my progress and writing about my experiences being vegan at http://www.AHealthyVegan.com
feel free to check it out.