Yes, you’re right: poverty does come up as an etiology of diabetes but I did not mention it because it was not the focus of my post. One man from one of the towns calls poverty a “problem” and an “enemy.” Most of the patients perform menial jobs for a living and their sources of livelihood do not financially empower them into eating healthy food. So, they eat what they can afford which means eating lots of cheap carbohydrates such as bread and rice.
Islam does not discourage education or mistrust of medical professionals. I think the link between God and diabetes has to do with the chronicity of the disease. A lot of patients lose hope as a result of this and so, they believe that where doctors and drugs fail in healing them completely or fail in ridding them completely of the disease, an all-knowing and all-powerful God won’t.