How do you lose 2-3 kilos in 5 days?

The wife and I havent lost quite the 5 kilos you're asking about but we've dropped quite a lot of weight in a short period, probably about 8 lbs in a couple of weeks by avoiding all starches and sugars (carbohydrates),(Ex: Breads, Pasta, & any sugar based drink like soda pop. Also we stopped eating after 6:00 at night. Your body uses carbohydrates as fuel to provide quick energy, and when your body doesn't use them all up, it converts the excess to triglycerides and then changes them to fat. This is a natural process that started when man lived in caves and didn't know when he was going to eat his next meal. The accumulated body fat was the body's way of storing energy to protect itself against periods of no food. When you eat later at night (especially carbs)and then go to sleep, you become relatively inactive and your body has to do something with those carbs, so it stores them to become fats later on down the road. Also try eating one full plate at each meal that you eat-don't skimp, BUT... GET IMMEDIATELY AWAY FROM THE TABLE SO YOU DON'T TAKE SECOND OR THIRD HELPINGS. Maybe this sounds silly but think about it... When you go to a restaurant you don't leave hungry, and yet you don't generally get second helpings, unless of course you go to a buffet style place. I hope our experience with this helps-it involves a fairly simple lifestyle change, but it seems to work for us, and once we got used to those changes and it became a routine part of our day, we found that it tended to keep our excess weight off long term.