Apple cider vinegar is a vinegar made from fermented apple juice. It is made by crushing and squeezing apples. Bacteria and yeast are added to the liquid to start the fermentation process, which converts the sugars to alcohol. In a second fermentation step, the alcohol is converted into vinegar by acetic acid-forming bacteria. Apple cider vinegar has no medicinal or nutritional value. Some clinical evidence supports that regular consumption of apple cider vinegar helps to maintain or lose body weight, or is effective to manage blood glucose and lipid levels.