1. The acidity of apple cider vinegar is too high, it is better to dilute it with plain water or fruit juice before swallowing apple cider vinegar. Because pure apple cider vinegar may damage tooth enamel and throat tissue.

2. Drinking apple cider vinegar for a long time will lead to the decrease of potassium and the decrease of bone density: for the people who are deficient in potassium and have osteoporosis, they should consume apple cider vinegar cautiously.

3, apple cider vinegar may offset the effect of diuretics, laxatives.

4, diabetic patients taking apple cider vinegar should follow the doctor's advice, because the vinegar also contains chromium, which will sway the insulin substance.

5. Apple cider vinegar is acidic and has a stimulating effect on the stomach, so if an individual has excessive stomach acid and drinks apple cider vinegar for a long time, it will lead to acid reflux, heartburn and heartburn.