The 7-Day Diet is a low-calorie weight loss plan that is said to help individuals lose up to 10 pounds in a week. The diet involves eating specific foods on specific days, with a focus on consuming low-calorie, nutrient-dense foods and avoiding processed and high-calorie foods. The diet includes several days of eating fruits, vegetables, and lean protein, as well as a "cleansing" day that involves consuming only certain types of fruits and vegetables. The 7-Day Diet is not a sustainable long-term weight loss solution and it is important to consult a healthcare professional before starting any new diet.