I am not sure some other piece of grilled meat would actually look that much different after that period of time given the same environmental circumstances. This project, while maybe interesting from an artistic and intellectual standpoint, does not actually say much about about the nutritional aspects of such food.
I like fast food from time to time. I would not want to base my nutrition on McD, far from it, and I enjoy eating good, self prepared food from fresh ingredients. But I don't think I live a lot less healthy just because I eat a burger every now and then if I don't want to take the time to cook for myself.