Anyone know the fastest diet that will make me drop 3 sizes in under two months?

I am trying to lose weight now and i can't do this because my family doesn't take me seriously about losing weight because they believe being big is better. I am a size 14 and trying to be a size 8 or 6, anyone know the fastest way to lose weight.

Your advice is muchly appreciated.
Anyone know the fastest diet that will make me drop 3 sizes in under two months?
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