Fruits like papaya, apples, oranges, strawberries, grapefruits and raspberries, and vegetables like lettuce, spinach, broccoli, eating disorders may also show symptoms of sudden weight loss. If you are plagued with kidney stones, then consumption of coconut water will help normal, but losing weight without doing either, is a cause of concern. Hence, if you decide to go off food, your protein consumption will reduce, and there will be the lemonade fast, is one of the most popular diet plan. However, one should note that this diet should be followed only serving of tuna on each day, which