Acidity is often caused because of an extended gap between meals, empty stomach or excessive intake of tea, coffee, smoking etc. to digest food; the gastric glands in our stomach secrete acid. However, when these gastric glands secrete excess acid, then we may experience acidity.

Apple cider vinegar may be a liquid produced during the fermentation of apple cider. During this process, the sugar in apples is fermented by yeast and/or bacteria added to the cider, which then turns it into alcohol and, finally, into vinegar.