Why do people go on a diet?

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Here are my corrections for you:

Many people have negative image about fat guy.

>> Many people have negative images about fat guys.
Maybe people thought that fat guys are dull and lazy.

>> Maybe people think that fat guys are dull and lazy.
So many people want only good body shape like a model.

>> So many people only want guys with a good body shape like a model.
I think that the mass media has affected to ours.

>> I think that the mass media has affected us.