I think the focus for a sedentary person should be one of carb control for the purpose of appetite control, rather than the purposeful drastic increase of fat intake.
Just know why you're increasing your fat intake and not go crazy with it. What's most important is to eat real food, get good sleep, stress less, get some sun and move your body.
Ps. I lost 80lbs without any exercise on the paleo diet before I felt compelled to start exercising.