The grapefruit diet made easy! The grapefruit diet has been a popular weight-control program for decades, but it can be expensive and inconvenient. Our grapefruit pectin is a hassle-free, economical way to get the benefits of grapefruit. Taken with water before a meal, it can create a feeling of fullness, helping reduce the urge to overeat. Plus, as a natural source of soluble fiber, it makes an excellent supplement for daily colon health care.