A child has less time for self-directed daydreaming and thinking. It takes away time for participating in sports, music, art, or other activities that require practice to achieve competence. TV interferes with conversation and discussion time. It reduces social interactions with family and friends. TV discourages reading.
Reading requires much more thinking than television.
Reading improves a youngster's vocabulary. This much TV interferes with study, reading, and thinking time. If children do not get enough sleep because they are watching TV, they will not be alert enough to learn well on the following day. TV discourages exercise. An inactive life-style leads to poor physical fitness.