I think it's important to get multiple angles on any topic in order to reduce our limited perspective. Being informed often helps us make better decisions. Super Size Me is a documentary/entertainment that has a lot of interesting information, but it also seems quite dramatic. In the other hand, we have Fat Head-- what seems like a low-budget counter Super Size Me.
In a way I tend to side with Fat Head a little more because it covers some of the reactions that occur when we ingest too much sugar. The good thing about each one of these videos is that they allow us to see some of the rhetoric used by companies, movie producers, etc. It's good to have Aristotle's ethos, logos, and pathos in mind as you navigate these movies.