Yes of course there are shows like thatBiggest loser, I can make you thin, Honey We re Killing the Kids... and I can t speak for other people but those shows are made for entertainment and you can chose to believe what they say if you want to!!
Only on Food Network and FIT TV on satellite tv. Sometimes I see other cooking shows on basic channels.
I have an American pen pal (i m British) and she watches our British version of you are what you eat.xx