In 2004, the American Diabetes Foundation found in a study that 2 Tb of vinegar before meals significantly increased insulin sensitivity and reduced insulin and glucose spikes after meals in both diabetic, prediabetic and healthy groups which in turn resulted in significant weight loss. To read more, http://articles.mercola.com/sites/articles/archive/2009/06/02/Apple-Cider-Vinegar-Hype.aspx