I don't need a study to tell me that since I did an experiment with n=1 (myself as the only subject). I've lost weight before on low calorie diets but was always frustrated by the fact that my vitals never improved significantly (i.e., blood pressure, cholesterol, blood sugar, etc.).
This time I lost weight and have been maintaining a relatively low carb life style and everything has improved. No more blood pressure medication. Good cholesterol way up, bad cholesterol way down, blood sugar levels normal, etc.
I find it funny when I see people arguing about whether one kind of diet is better than other, etc. I say, just try it out and see for yourself. Maybe low carb won't work for everyone, but no point arguing against it when current way of eating is putting you in worst physical condition.
BTW, if anyone wants to learn more about all the research that has been done on the low carb way of eating, Good Calories, Bad Calories is an excellent book. Not a diet book per say but goes into great detail about how we come to believe that low fat, high carb diet is good for us and how that is exactly the opposite of what we should be eating.