yes you can !!!! check out OPTIFAST, it is a medically supervised program, with weekly group meetings for support and helpful information to change habits regarding food choices
You certainly can: just make sure you do it the healthy way, and don't over-abuse your body. Cutting junk, sodas, juice, and carbs (in the right amount so that you don't crash either) would do it. Don't forget to exercise! :-) Good Luck!
You probably can't lose fat that fast. Generally the most an average person with no special considerations can lose is about a pound a week. More can be lost through water weight with diuretics and crash dieting can also increase fat loss but only for a short time. When we lose fat too fast our metabolism will slow in order to conserve fat (fuel) deposits (starvation mode) and that creates new problems such a resetting the metabolic rate and fat gains during the plateau, etc.
I lost 20 lbs in 4 month you can do it eat healthy lots of water low carb high protein
It's possible, but certainly not easy if you're going to do it in a healthy manner.
If you drink sodas and eat junk food, simply cutting those out, will give you a good start.