There is one mistake in each sentence. Underline and correct the mistake

there is one mistake in each sentence. Underline and correct the mistake 
1. sitting close to the laptop's screen hurt your eyes
2. you can avoid many diseases by eat healthy food
3. you look so bad ! How's wrong with you ?
4. Eating lots of fast food can make you fat or obesity
5. Eating more fruit and vegatables to get vitamins, minerals, fiber
6. Good nutrition is a important part of leading a healthy lifestyle
7.watch more television if not your eyes will be tired
8. I've drunk three glasses of beer but I've got a headache