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Look at the stats from the original article.
About 1 in 10 have the virus but don't get fat.
About 3 in 10 have the virus and do get fat.
That means that 7 in 10 fat people do not have the virus, and 1 in 4 people with the virus don't get fat.
This is neither an explanation of 70% of obesity, nor a cause of it in 25% of infections.
Nobody has published anything about the direction of the causality in this case. At school 20 years ago I was taught that one of the side effects of obesity was a less effective immune system; could it be that rather than proving "This virus makes you 3 times more likely to get fat" all they've done is prove "fat people are 3 times more likely to get this virus".
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Overhead, the Albatross hangs motionless upon the air,
And deep beneath the rolling waves,
In labyrinths of Coral Caves,
The Echo of a distant time
Comes willowing across the sand;
And everthing is Green and Submarine
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