Mexicans and other Latin Americans have a higher risk of diabetes because of a Neanderthal gene mutation, researchers say. These findings could uncover new targets for diabetes drugs, investigators added. An international team of researchers focused on Type 2 diabetes, the most common form of the disease, accounting for 90 percent to 95 percent of diabetes cases in humans. In Type 2 diabetes, the body either does not generate enough insulin or its cells ignore the molecule. Insulin is a hormone the body needs in order to use sugar for energy.