Despite claims by zinc supplement manufacturers that the pills can help prevent type 2 diabetes, clinical trials do not support this hypothesis.

Laboratory research suggests that zinc helps promote the production and action of insulin. A four-week study of 56 obese women found that zinc did not have an effect on factors associated with the development of diabetes. This study was an example of one trial that treated 56 people with either zinc or a placebo for four weeks and found no effect. This single trial is too small and too short to tell us anything about the effectiveness of zinc in preventing the development of type 2 diabetes.

Research does support that zinc plays a key role in the regulation of insulin production and glucose utilization. Diabetics have shown a zinc deficiency, which impairs their ability to use glucose. However this fact does not confirm zinc as a supplement to prevent the development of diabetes. I apologize it's a nonevent insofar as news. But look at it this way – it's one trial. Nobody says you have to cross it off your list because 56 obese women didn't see a change in their risk factors for developing diabetes. One study is not gospel.