Thats an excessive amount of weight to try lose in one week.....I honestly don't know any physician who would recommend losing that amount in such a short time. It would be an awful strain on the body...and most of all the heart. Most drs recommend losing between 1-2 lbs a week to be healthy and not cause damage to your body or internal organs.

Why do you feel you need to lose so much in such a short time? I"m certainly not trying to be discouraging, but your post is worrisome.

i had a boxing match and i had to loose that much weight in a week but they extended it to 2 weeks cuz of the amount of weight i have to loose

but i stil need to loose that amout of weight

This is actually pretty easy to do. Try to limit your meals to a portion of veggies & a chicken breast. Also go buy some detox pills. they can be found at vitamen world, gnc, etc.. They will help you flush water weight & any extra fats that were in your meals.
Go to the grocery store buy a frozen bag of chicken breast or tenders, make sure its less than 5 grams of fat & a bag of frozen veggies.

simple as that. everyone i have recommended this too, and myself, have lost about 13 lbs in the first week. every week after that it comes off slower but your first week you drop weight quick!

good luck.