Forget diets: Cutting fat keeps you slim - Vitals
Ooooo, you can lose 3.5 lbs opting for low fat versus the SAD diet. I'd say that's about what you can hope to expect eating a miserable low fat diet. Throw in some chronic cardio and you might lose 5. Then when your body craves fat, you can go on an eating bender and gain back those 5 lbs plus 5 more.
Of course, actually eating fat and cutting processed foods and reducing carbs to reasonable levels yielded me a loss of over 35 lbs to date.