A lot of people who overeat don't realise they are overeating until someone else points it out. "Wow, are you going to eat all of that?" Even if they are overweight because of it, they don't make the connection between the weight and the food. This is because they eat unconsciously. We also attach powerful triggers to food, which make breaking habits difficult, unless you have adequate mental training. TV is one of them. Do you know someone who can't sit on the couch and watch a movie without gulfing down a packet of cookies? They've done it enough times that in their mind, TV equals chocolate time, or popcorn time, or whatever unhealthy food time.