The secret of weight loss lies in grape fruit, which is a rich source of vitamin C and vitamin A. Grapefruit is low in calories, rich in fibre and relieves constipation. Also called mayo diet plan, grapefruit diet plan includes an intake of grapefruit in the form of pulp or juice. After 8 to 10 weeks into the grapefruit diet, you will see dramatic changes in your health and fitness. To lose weight by...