What causes overweight and obesity?

I think because those were lack of energy balance,
it means when you take in more calories than you use.
and other causes are...THEY are inactive lifestyle. 
one reason for this is that many people spend hours
 in front of TVs and computers doing work, schoolwork,
 and leisure activities. In fact, more than 2 hours a day
 of regular TV viewing time has been linked to overweight 
and obesity. Furthermore, Because families also share food 
and physical activity habits,a link exists between genes and the environment.


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