If you want to lose weight then you must create a calorie deficit. One way to create a calorie deficit is by restricting your diet. Some people, in an effort to lose weight quickly, will reduce their caloric intake down to zero. In other words, they stop eating.
While this is unhealthy, and even dangerous, you can lose weight. How much depends on a variety of factors such as size, fitness level, age, gender, and how much you ate before you stopped eating.
Most people report losing between 4-10 pounds if they go on a week long fast that includes just water. Most of the weight is water as the body uses up all of the stored carbohydrates. You will lose some fat and muscle long the way.
If you restrict your eating enough you can lose weight to the point of even death. This is what occurs to people who suffer from eating disorders such as anorexia.
People who choose to lose weight by ceasing to eat almost always gain it back and then some. But if you’re wanting to drop a few pounds and get rid of any bloat then fasting is certainly one method. Once your fast is over it is important to not eat a large meal. Doing so will cause gastrointestinal issues such as gas, heartburn, and diarrhea.