High Sugar Levels Impair One's Ability To Fight Infection: Study Diabetes has now been found to be fuelling India's deadly tuberculosis (TB) epidemic. In fact, according to researchers, it may be to blame for more than 10% of TB cases in India and China. After reviewing scientific data of the last four decades on 1.7 million people from 13 studies done in Canada, Mexico, US, Britain, Russia, Taiwan, India and South Korea, researchers at the Harvard School of Public Health in Boston have concluded that diabetics are three times more at risk of developing active TB that those with normal blood sugar. Announcing the finding in the Public Library of Science journal