A common perception is that, if diabetes means too much sugar in the blood, the logical solution to prevent or cure diabetes would be to avoid or restrict the consumption of sugar and carbohydrates.
Dr. Barnard advances the idea that, due to an unhealthy lifestyle, fat accumulates in the cells, preventing them to properly respond to "insulinum", which in turn, leads to type II diabetes. The research studies he conducted demonstrated that a plat-based diet (complete avoidance of animal products but no restrictions on carbohydrates) can prevent and even reverse type II diabetes.
In type I diabetes, a plant-based diet reduces the likelihood of complications. In fact, milk is considered to be one of the factors which triggers the onset of this condition.