Scientific American has an interesting articele in its June 2005 issue
about obesity. Here is the link: http://tinyurl.com/8ut27
In summary, it says that obesity statistics are not true and/or not up
to date. Obese people are not at great risks as is known by general
public. "Anti obesity industry" is accussed to pump up the numbers, etc.
What it does not say (as far as I can see in the article) is the effect
of the weight on the joints, or many other points for that matter. But I
think the article is mainly focused on life expectancy of obese people,
which it says does only differ about 4-9 months from normal (according
to BMI) people.
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Burak
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