The first reason that make problems to our health such as when you play the internet a lot of time. This mean that you play the computer a lot. This make effect to our eyes that can make our eyes short-sighted and sensitive to light. In the same way the internet can make our overweight because when you play the computer you spend a time to sits front of the computer that make you can't to exercise. This mean that internet is cause make our to overweight.
The second reason is that make our to waste time. Game online make that it make our spend a lot of time to play for level up or rank in the game. Similary, chat room is can to make our spend a time to chat to friend or someone. That make our have no time to doing anything it make banefit to our lifes so but it can't to if it without the internet.