Does the mb info list saturated fat?
I do take your point on the calories and I agree, but satiated or trans fat in the cheeseburgers would come into the equation would it not? You can lose weight and have an unhealthy heart - look at the Atkins diet.
Please don't start on Atkins, there is massive misinformation out there on it and a lot of people that barely read what it was about before embarking on it and basically thinking they could eat bacon 24/7 (completely untrue).

I think in general we still know how little food affects the body, it appears to be such a complicated process. Also these days many studies seemed be funded by companies with an agenda. One will point out the bad about sugar, another about fat, another about heart disease, another about cancer. At the end of the day if you put all the studies together we are basically damned no matter what we eat.