Whether you want to admit it or not fat people are consuming too many calories. If you have bought into the Atkins Die From Heart Disease DIEt or the South Beach Die a Little Later From Heart Disease Diet the fact still remains that the amount of calories you consume has a much much greater effect on your weight than the source of those calories.
Eating Healthy is not rocket science and you don't need some dead quack like Robert Atkins or some dying quack like Arthur Angaston filling your head full of junk science and absurd theory. You need to know how many calories you are eating and you need to know the proper ammount of calorie you need to consume for your age, size, sex and lifstyle.
This will get you in the ballpark. It's free and it is accurate.