Acetic acid bacteria are beneficial bacteria. Acetic acid bacteria, or Acetobacter, are specialized aerobic bacteria. Acetobacter is widely found in kimchi fermentation and grows and multiplies rapidly under conditions of adequate oxygen supply. Acetobacter can directly convert glucose into acetic acid if there is sufficient glycogen. Vinegar formed by acetic acid bacteria is an indispensable seasoning in diet, which can stimulate gastric nerves and has the effect of appetizing and eliminating stagnation. Especially for the lack of stomach acid in the middle-aged and elderly people, has a very good effect on digestion. In addition, acetic acid bacteria are beneficial bacteria. Dietary Acetobacter can regulate intestinal microecology and maintain intestinal ecological balance, which can play a role of probiotics and help human health. Acetic acid bacteria are beneficial bacteria, but the effect is limited, if there is discomfort, please hospital medical treatment.