Yeah, basically, he went out to prove that it's poisonous and he'd prove it by consuming a lot of it, more than a normal individual would.
The reality is different, though. (Not saying fast food is good for you, just saying that it's not poisonous like the movie would claim).
I'll post an excerpt from wikipedia.
TL;DR: the dude was drinking a lot during the filming and didn't tell anyone (including the doctors) about it. His drinking was likely the reason his health was deteriorating.
A 2006 study on fast food consumption by healthy individuals inspired by the documentary showed that, while the heavy diet does affect liver enzymes, it did not show the same dangerous effect shown in the documentary. This suggested that the extreme reaction must have had another cause,[28][29] and in 2017, Spurlock–who previously told his doctors he did not drink–admitted to copious amounts of alcohol consumption during the making of the film, which some critics, such as documentary filmmaker Phelim McAleer, have argued may better account for his liver issues and other health problems, since he had only changed his diet and not his alcohol intake during the experiment.
Edit: here's a short video about the guy lying about his caloric intake
Yeah, basically, he went out to prove that it's poisonous and he'd prove it by consuming a lot of it, more than a normal individual would.
The reality is different, though. (Not saying fast food is good for you, just saying that it's not poisonous like the movie would claim).
I'll post an excerpt from wikipedia.
TL;DR: the dude was drinking a lot during the filming and didn't tell anyone (including the doctors) about it. His drinking was likely the reason his health was deteriorating.
https://en.wikipedia.org/wiki/Super_Size_Me#Counter-claims
Edit: here's a short video about the guy lying about his caloric intake
https://youtu.be/Ccdfzq2M1Ec