Super Size Me is a documentary designed to warn the audience about the dangers of fast food, which it does pretty openly. However, most people misinterpret the intended message of the film's central stunt, in which Morgan Spurlock eats three meals a day of McDonald's. The point was not that it's unhealthy, which is obvious, but to show how unhealthy it is. This is why the film juxtaposes his doctors' expected results at the beginning ("You'll gain some weight") to their analysis at the end ("Stop this experiment if you value your life").
The extent to which it was unhealthy for Spurlock has remained controversial however, because nobody's been able to accurately recreate the results he was able to get in the movie. Some of this is no doubt due to McDonald's no longer offering a super size option, but some have speculated that it may have also been due to Spurlock having been a vegetarian before he started the experiment and thus his body wasn't used to high meat intakes anymore. The fact that Spurlock never released the McDonald's receipts that he got during the experiment has only fueled these controversies.
The trope doesn't seem to fit a nonfictional documentary, which has no narrative to get in the way of delivering the message.
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The trope doesn't seem to fit a nonfictional documentary, which has no narrative to get in the way of delivering the message.