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POPSHow Effective Is Slim Fast Diet Plan? Slim fast diet plan is one method that can help conscious people achieve a fit and healthy body. Having a great body can boost a person’s social life and people tend to look for ways to cut down their weight in a period of time. 3 2 1 slim fast diet is a crash diet that claims to help you lose 10% of your body weight within the first six month of using it.