What is the best food for people who are suffering from obesity?

For almost six months, I am suffering from obesity. My age is 34 and my height is approx 6 feet and my current weight is 310 pounds. I am obeying all the treatments that the doctor prescribed me like eat less and exercise more. I am also taking medicines like sibutramine and orlistat. But the main problem that I am facing is regarding the selection of food. The doctor told me that you have to eat only low fat food, but there is a lot of confusion on selecting the best one. I want to ask from you people what are the best foods for people who are suffering from the obesity? Please share with me some personal experience?