The Weight of the Nation, a four-part health documentary series looking into the obesity crisis in the United States.
The film looks into all aspects of the problem from its root causes, symptoms and treatments. As well as providing on the ground research, "The Weight of the Nation" also features commentary from a number of scientifically minded people including Robert Lustig, Samuel Klein, Francis Collins and Rudolph Leibel.
Of course, various counties have similar issues so many of the points made in each of the films could be applied anywhere else, though the US seems to be the worst.