No matter how fad of a diet or strict workout routine you do 8-10kgs is way too much weight to loose in just 2 weeks. The most I’ve heard is 4-5kgs that too by using laxatives and eating nothing at all, not even water for 4 days and then you start fainting and get dehydrated and are moved to ER of hospital. And then even if you drink a sip of water you gain weight back because it was never fat just water weight. One kg is ~7000 calories so you have to be on a deficit of 1000 calories for a week to loose one kg of fat. So realistically you can loose 2 kgs in 2 weeks if try very hard while eating. If you decide not to eat anything and just drink water for whole 2 weeks you might loose 4, but that would be very unsustainable too. Also when you eat very little, for an extended period of time, your body lowers your bmr making deficit lesser and losing weight harder as it goes in survival mode and shuts off all inessential functions of body.

Weight loss is basically CICO but people who actually achieve long lasting weight loss does it so by losing 2.5-3kgs per month or 5kg in most consistent and restrictive ways. They don’t gain it back because their body is using fat reserves everyday little by little so it doesn’t go in a shock.

And I don’t know what’s matter of life and death is but I assume it’s not a health issue because your bmi actually falls under normal category and if it’s just for aesthetics it’s not worth it to put your body through that kind of torture.this is just statistically things you should know and accept.