Pre-existing Conditions

Heart Disease
Include bananas and avocados when juice fasting to balance the blood sugar level. Toxins in the blood and reduced blood sugar levels may cause a weak heart to labor. Like any other organ, the heart needs nutrients, a toxin free environment, and time to heal. Also if one has the disorder of POTS it is advisable to take salt so that the blood pressure does not get too low.

Hypoglycemia
Do not juice fast unless you use bananas and avocados to balance the blood sugar level.

Kidney problems
Fasting can irritate damaged kidneys due to the amount of toxins they filter. Try short juice fasts of 3 to 5 days before progressing to longer fasts.

Liver Disease
The liver can become toxic due to abuse. If the liver is badly degenerated, cleansing must be done in stages. Start with short juice fasts and lead to fasts over five days. Avoid heavy proteins, refined flours and fatty foods. Eat meals of fruits or vegetables between the fasts.

Age
Nobody is too old to fast - it is exactly what the body needs to feel young again. Shorter fasts are recommended to start. Assess your physical state as you proceed. If juice fasting becomes too intense, bananas and avocados will lessen the intensity by slowing the cleansing.

Ulcers
Fasting will help significantly. Choose the juices that do not irritate the condition.