Teenagers with a bedroom television tend to have poorer diet and exercise habits and lower grades in school than those without one, U.S. researchers said on Monday.

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Not surprisingly, those with a bedroom TV were more apt to watch it a lot, clocking four to five more hours in front of a television per week, the researchers said. Twice as many of the teens with a bedroom TV were classified as heavy TV watchers -- at least five hours a day -- compared to those without one.

Girls with a bedroom television reported getting less vigorous exercise -- 1.8 hours per week compared to 2.5 hours for girls without a TV. They also ate fewer vegetables, drank more sweetened beverages and ate meals with their family less often, the researchers said.

-- or, people who have no clue prefer to watch TV and eat a lot of unhealthy food. Whichever it is, the behaviour is a disease in our society today.