Juice fasting , also known as juice cleansing , is a controversial fasting method and a detox diet in which a person consumes only fruit and vegetable juices to obtain nutrition while otherwise abstaining from food consumption. Juice fasts may last anywhere from a few days to several weeks. The juice consumed during a juice fast is not the type commercially available, but rather that produced from freshly juiced fruits and vegetables . Reasons for fasting Reasons to undergo juice fasting may include spiritual or religious reasons, detoxification , a desire to lose weight, or attempts to stop habitual behavior such as smoking, drinking soda, overeating, or caffeine addiction. Participants may use juice fasting as an alternative medicine . Participants may believe juice fasting will cure chronic pain, cancer, depression, arthritis, severe infections that resisted antibiotics, autoimmune diseases, and many other diseases. One reason for ju