Hi Rachna,
    Not only do most television programs and channels often include countless ads for unhealthy, highly processed foods, but there has been research supporting the consumption of more calories while viewing television. For example, children in one study ate around 230 more calories while watching television, while in another adults ate an extra 140. While this may not sound like much, the additional caloric intake with little to no energy expenditure can greatly affect overall health and weight gain.
 
Here are some reference articles regarding the matter:
http://www.reuters.com/article/healthNews/idUSPER95653920080709
http://www.healthandage.com/TV-and-Eating-Habits

Yes.. in kids and in seniors who do nothing but watch tv. Eating comes from it being advertised at every turn, and from the kids/seniors not being active leading to boredom.