Your sister’s dedication is to be commended. Fruits and vegetables are wonderful sources of many nutrients that are essential for health, but may not provide all the nutrients needed by someone who is seriously ill. Fruit and vegetable juices may provide little protein, fiber, vitamin B12, vitamin D, and essential fatty acids all of which are necessary for health. Some may interfere with medication she is given, as may the Chinese herbs. Even though she needed to lose weight, her weight loss may be a cause for concern since this may be an indicator of malnutrition. Perhaps it is time for the three of you to revisit your mom’s diet with the input of her physician and/or a dietitian who specializes in clinical care (check with your hospital or the American Dietetic Association).