You could choose the Grapefruit diet which has been very effective for many people for fast weight loss in a very short period of time. But, the grapefruit diet is fairly restrictive on the types of foods, and is best used for short periods of times while followed up with another healthy diet program.
Some people choose the extreme, and will use the Lemonade Diet. The Lemonade Diet will flush your body of toxins, and waste, and since you are on very low calorie intake, it's also a great fast weight loss diet. But is definitely a short term solution.
If you are needing to lose a higher amount of fat, then the fastest fat burning diet will be a combination of exercise, and a healthy diet program. You will lost the fat more steadily, and it is a diet you can sustain for a long period of time.
