Check out "That Sugar Film," it was on Amazon Prime when I saw it. Highly recommend.
In it, he goes from a zero-sugar diet to a "recommend healthy amount of sugar" (and from "healthy" sources — he is not eating candy) while maintaining the same calorie count and exercise routine.
Spoiler: he gains weight and inches and develops a fatty liver.
And as for the talking heads he chose, well... http://www.slate.com/articles/health_and_science/medical_exa...
I still think there is a lesson to be learned. If we can assume his calorie intake remained the same (which he claims, but given your link, who knows), we can say that the source of the calories matters. I've met a few people who only subscribe to calories in vs calories out.
By keeping his calorie intake the same but replacing all foods with those containing added sugar, he really tipped the scale. I suspect with more calories he might have gained some weight but would feel better and not have that liver issue.
I've never seen an honest documentary on nutrition.
Spoiler: the summary given in this comment is not accurate and the film spouts a bunch of quackery.
He didn't eat he "recommend healthy amount of sugar," that would be no more than less than the equivalent amount in a can of soda.
He didn't get liver disease.
http://www.slate.com/articles/health_and_science/medical_exa...