Can anyone help with crash diet recipies?

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hi all, I have recently joined a gym and the coach has told me that i can loose a lot if i can do a crash diet for a month. He believes that i can't go in for a crash diet because of lack of determination. I believe that i can do it and i want to show him that i can. I am starting today so please help me with it... Thank you all and wish me luck for the comming month.