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Is weight gain caused by an obesity virus?
Poor eating habits, too little exercise, and faulty genetics have
all been blamed for the rise in obesity over the last few decades.
Now, researchers suggest another possibility — that a virus
triggers weight gain in some people.
Obesity virus
The recent interest in "infectobesity" began after Dr.
Nikhil Dhurandhar found that mice and chickens infected with a common
human virus gained much more fat than uninfected animals [2]. In
four experiments, the Wisconsin researchers inoculated chickens
and mice with a virus known as AD-36. After several months, animals
infected with the virus weighed more on average than those without
the virus. Their bodies also contained far more fat.
Human studies show that roughly 3 in 10 overweight people show
signs of exposure to AD-36. This compares to less than 1 in 10 of
the lean population. Of course, while this research shows a link
between AD-36 antibodies and human obesity, it doesn't show that
it's causing it. The only way to know for sure would be to inject
people with the virus. For ethical reasons, this is very unlikely
to happen!
But is it really an obesity virus that's solely to blame
for the frightening rise in obesity over the last few decades? Is
it due simply to the fact that we're doing less or eating more?
Or is it the case that "faulty" genetics make long-term
weight loss almost impossible for some people?
Believe it or not, the...
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