Unfortunately, there is nothing that can be done to prevent Type 1 Diabetes from occurring.
Scientists are always looking for prevention method that can be used to help people with high risk of getting Type 1 Diabetes so that they can continue to lead a normal life without the fear of developing this deadly disease.
There are also researches being done to find out if it is possible to prevent further destruction of islet cells to those newly diagnosed with this health problem. You might want to participate and go for the clinical trial. But make sure that you do your due diligence before going for any of them.
People with Type 1 Diabetes can prevent themselves from getting the serious health complications by continuously keep their blood sugar on the normal level.