MeBLady, I agree that weight loss can't explain the improvements in health completely.
For myself, my diabetes was completely controlled within 2-3 weeks of starting low carb; not enough time to have lost a great deal of weight (I'm a Turtle when it comes to losing). Ditto for my blood pressure.
My DH also experienced almost immediate relief of his gastric reflux symptoms when he joined me on low carb (within a few days, actually)...again, weight loss could not have been a contributing factor there.
When I track on Fitday, my percentage of calories coming from fats are consistently in the 55-65% range and have been for the nearly 4 years I've been on low carb since my plan keeps me at 30 grams of carb per day on a permanent basis for blood sugar control.