The correct way to lose weight and actually be able to keep it off is to journal you daily caloric intake and maintain a 200 to 300 calorie deficit.
This will allow you to lose .5 to 1 kilo (1-2 lbs) per week. If you try and loose a stone (14lbs, 6.4 Kg) you will have a very hard time doing this and if you do the weight will pile back on and you will have a good chance of ending up weighing more.
The body is designed to recognize when a food source famine is occurring. What it will do when it recognizes this, and it will think your self induced famine is a real famine, is it starts trying to hold onto and build up as much as its fat reserve as possible.
If you were able to loose weight that fast then you would be losing muscle instead of fat. Fat over muscle looks better than fat over emaciated muscle. This is why people that lose weight rapidly look worse than they did before they lost the weight.
If you lost the weight this fast you would be extremely hungry all the time as your brain would be kicking strong motivation for you locate food and eat it.
After the self imposed starvation the metabolic system would be set in famine mode so you would probably not have lost much of the fat storage, but instead lost your muscles. Then when you started to eat again it would put that all back into fat before it would back into muscles.
Instead of looking or a quick fix that could have very bad results, I would instead come up with a good strong plan to do it the successful way.
Healthy diet full of nutrient rich food and cut way back on carbs. You need to eat to lose weight.
Journal everything you eat and the calories it contains and maintain a two to three hundred caloric deficit.
High quality multivitamin
Strong exercise regiment. Both weight training and also cardio. For the cardio I would do interval training. If you're considering not doing the weight training.. take a look around at your gym a check ou the bodies of the people who just do cardio and compare them to the people who do both or even just weight train. If your gyms like mine Im pretty sure you will notice that the people who lift look much healthier and fit.
Hit the gym, eat right in the right amount, and you will see your body, health, mental health, and weight steadily improve and improve.
I would consider just making this change a permanent lifestyle change instead of setting a goal to be reached.
Here is a thread you may want to participate in
Exercise 4 Health, Mental Health, and Addiction vs. The Endorphin Factory