To lose 20 pounds on a water fast it will take around 20 days although some people have lost 20 pounds of weight within a week on a water fast.
To lose 20 pounds the water fast usually needs to extend past the 24 hours to 72 hours, which is based on the average loss of 1 pound of weight per day.
It's also important to note that the significant portion of the initial weight loss during the water fast is water weight and stored carbohydrates also known as glycogen and not just the fat in the body.
The water weight that you can lose during the water fast can return after you start eating again normally.
True fat loss during a water fast can often result in at least half a pound of weight loss per day during extended water fasts.
Water fasting is where you consume only water for a set period of time which is often 24 hours to 72 hours, while you also avoid all other beverages and foods for these hours.
Water fasting can lead to weight loss and provide some health benefits such as lower blood pressure.
However water fasting can also lead to dehydration, electrolyte imbalance and potential complications for some people.
Water fasting can lead to a short term decrease in your body weight and can help lower blood pressure and can reduce the risk of certain disease and conditions such as cardiovascular issues, insulin resistance and obesity.
Water can also cause you to experience side effects such as headaches, disordered eating patterns and mood changes and restricting of food intake can also disrupt your electrolyte balance.