Apple cider vinegar helps with controlling diabetes and blood sugar levels, according to WebMD. Cider vinegar's antiglycemic effect is similar to certain medications that control blood sugar in that it blocks some starches from being digested. Apple cider vinegar shows promise in lowering blood sugar after meals, states Authority Nutrition.
Diabetics currently taking medication for the condition and considering using apple cider should discuss this remedy with their doctors, as apple cider vinegar may exacerbate certain digestive issues and place a strain on bones and kidneys, warns WebMD. Because apple cider vinegar is very acidic, drinking it straight can harm the teeth or throat. It should be diluted in a ratio of 1 to 2 tablespoons to a large glass of water and sipped with meals once or twice a day.