My friend/ Your friend can have an major eye problem as watching T.V a lot can cause eye problems. He can suffer from Obesity, obesity happens when we sit and do not do any kind of activity If we be lazy then that all may lead to Obesity. Our brain can be affected by the light and sound.
He can start writing his own Diary that will take time and it would be interesting too. He can in his free time draw characters which he everyday watches at the television. Read books like comics or novels whatever he feels is interesting. Then he can try making his own food recipes. If he want to save himself then he has to stop watching t.v always