According to the scientific research bread does not actually cause diabetes. However, the fact behind the white breads ingredients states that its nutrients do not help and may cause a ride in blood sugar and finally obesity which may cause type 2 obesity. The diabetes board encourages people to take brown bread because of its nutrition contents.
It can cause type 2 diabetes which is when your body is overloaded with sugars too often. Bread itself breaks down into sugars in the body, and an over consumption over a certain time period can damage you. It'll take a while and you'll become obese but it can cause diabetes