How quickly can i lose weight with a zero calorie diet?

Not practical!: Drastic efforts to lose weight do not work well and do not last...So don't even try this approach. To lose weight you need to eat less but not quit because controlling weight is a life long discipline. So eat a balanced meal with calorie restriction in a way that is practical and enjoyable. Not eating anything is a punishment which no body deserves! add daily exercise to your diet for better resul.

This will backfire : On you. Your body will go into starvation mode and your metabolic rate will rapidly drop.

Not a Diet: Zero calories is starvation, not a diet. It is not sustainable. You will lose weight but as soon as you begin eating again it will come right back. The more sustainable approach is to change the food choices and quantities you consume. This is very hard to do in our society of high calorie fast food.