Answer:
Apple Cider Vinegar, especially unfiltered and unpasturized apple cider vinegar is a superior prebiotic food. Prebiotics are the food that our intestinal microflora (probiotics) need to thrive. Other foods such as cultered vegetables (fermented/pickled vegetables) and young coconut kefir are also excellent prebiotics for our probiotics. For more information on this topic, I found the following website very helpful with researching the cravings I had for apple cider vinegar:
http://www.bodyecology.com/07/04/05/apple_cider_vinegar.php
I just came off of the Master Cleanse diet after 21 days and this is when my cravings started happening. With such intense cleansing, the digestive tract is severely depleted of the microflora the body needs to break down the food and aid with the absorption of nutrients. These beneficial microflora (probiotics) are essential not only for digestion but also for immunity to parasites and disease.
Hope this helps!
Rachel