If you are getting adiquet protien to support lean weight, eating your veggies, and keeping claories up I don't think fat, even high levels, would be a bad thing. The only time I'd worry is if your protien and calories dropped way too low because of the appatite control. It's not the 90% fat that makes the fat fast dangeroud for the long run, it's the extreamly low calories and protien as well as the very rapid weight loss. To keep weight off and remain healthy it should be lost in a slow controlled manner (I don't mean you have to stick to exactly 1 pound a week, just ina controlled manner for you with eating habits that you can maintain after reaching goal)