The food industry spends billions of dollars on TV advertising because they know it produces results. When we see and hear the advertisements often enough, we eventually buy the products. Even dinnertime, the traditional family catchup period, has been transformed by TV, with many families opting to dine on fast food and take-out, rather than home cooked meals.
I am not saying everything about television is detrimental, but it seems to do more harm than good. Life beyond the filtered screen seems much more educational, interesting and entertaining. The good news is, that any environmental or behavioral influence (including TV) on a persons habits can be changed, but it takes determination and work.