America Is Fat: Jimmy Kimmel Figures Out Why (VIDEO)

WATCH: Are You Too Fat?

A recent study by the London School of Hygiene and Tropical Medicine found that people worldwide are 34 billion pounds overweight. They also found that, despite comprising only 5 percent of the world's population, Americans account for almost a third of those extra pounds.

So Jimmy Kimmel decided to look into what might be causing this phenomenon.

At first he was tempted to say it was bacon on ice cream sundaes, but then he cracked the code.

It's not what you may think.

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