MSG - can it cause weight gain?

We've all heard how MSG is bad for you. It gives people headaches, Chinese restaurants talk about how they avoid it, and no one knows what it is. Monosodium Glutamate, MSG for short, is pretty much in all processed foods. Just read the labels. Now according to a recent study it seems as though MSG has a positive correlation to weight gain. That doesn't mean scientists know why the two are related, but it seems as if they are. More research needs to be conducted to know what the relationship is and why it exists, but for now this falls under the general category of "eat less processed foods".