I cannot read more at the NYT because THEY won't let me and I will NOT give the traitors my name. ;)
What was making her gain weight? Just give me a summary, please.
unlikeliest of culprits: the microorganisms we encounter every day
It's multifactorial, i.e. history of obesity, predominance of what gut microflora, type 36 adenovirus infection, 50 genes, etc.
The article is 32,511 words long and you want a summary?
Here, courtesy of http://www.bugmenot.com/view/nytimes.com
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Go enjoy.