Losing 20 pounds in two weeks without exercise is not recommended and is not a healthy or sustainable way to lose weight. However, if you are determined to do so, you can do so by following a very low-calorie diet and cutting out all processed and sugary foods. You should also drink plenty of water and limit your sodium intake. Additionally, you should focus on eating nutrient-dense foods such as lean proteins, fruits, vegetables, and whole grains. Finally, you should get plenty of sleep and reduce stress levels as much as possible.
