In the first few minutes of "Sugar, the Bitter Truth" he shows that the average daily caloric intake has increased on average something like ~200 calories in recent decades, shows it's mostly sugar calories, then spends the rest of the video explaining info that supports his hypothesis that it's the fructose, ignoring that people are simply eating more and not using that extra energy, so they get fatter.

Every scientific claim I hear I run through this http://norvig.com/experiment-design.html and "Sugar, the Bitter Truth" raised a lot of alarm bells for me.