Some small studies have hinted that apple cider vinegar could help with several conditions, such as diabetes and obesity.
Vinegar (and other acidic liquids) have long been proposed as agents to enable weight loss, one proposed mechanism is that it prolongs the sensation of satiety after eating. A 2009 study on mice showed that consuming acetic acid (the active component in ACV), upregulates the expression of genes for fatty acid oxidation enzymes in the liver causing a suppression in body fat accumulation.
There is limited scientific support for the claim that apple cider vinegar can promote weight loss. However, one small study (published in Bioscience, Biotechnology, and Biochemistry in 2009) found that obese people who consumed acetic acid daily for 12 weeks experienced significant decreases in body weight, abdominal fat, waist circumference, and triglycerides. In tests on mice, another 2009 study (published in the Journal of Agricultural and Food Chemistry) found that acetic acid may help prevent the buildup of body fat and certain liver fats.