In a week? Hmmm! I don't think that you can lose weight in a week. In fact my daughter tried one of these one week diets and it did not work for you. I think your body takes a lot of time burn fat and one week is too short a period. You can opt for a detox one week diet if you wish to. This will help you get rid of toxins in the body and this is ideal for detoxing after a bout of binge drinking. If you want to lose weight then I suggest that you go in for a longer diet period. Three to four months will be ideal.