A patient might be living with diabetes for some time before their symptoms become noticeable, in which case they could be eating and reacting to food, unaware that anything is wrong. It's not a common idea that food intolerances might play a role in diabetes. Still, several things could cause your symptoms, including food. In most cases, food sensitivities are rare in people with diabetes. Still, it's important to note that food intolerances tend to develop in people without diabetes.