We can control a helicopter on Mars but fail to find a cure for diabetes.
The cure for diabetes is prevention. Minimize sugar and other sweets, refined carbohydrates. Doing this can also cure diabetes for a number of diabetics. Basically fish, fowl, meat, eggs, cottage cheese, low starch vegetables like salad greens, celery, cucumber, asparagus. After the diabetes is under control, small amounts of whole grains, and higher starch vegetables. Fats in moderate quantities like olive oil, butter, chicken with it’s skin, etc. Fresh fruits in modest quantities like blueberries, strawberries, citrus fruit, apples, grapes, pears. This diet will usually lead to weight loss as well.