I am assuming we are talking about the probability of Type II diabetes?
You can read https://www.vitamindcouncil.org/health-conditions/type-ii-diabetes/. The last time it was updated, though, was July 2013. So after that came https://www.vitamindcouncil.org/meta-analysis-of-rcts-suggests-vitamin-d-supplementation-improves-markers-of-type-ii-diabetes/. The take away in this one is that they say 4000iu a day or a minimum blood level of 40ng/ml (100nmol/l).
So to answer your question, “maybe” and the only thing you can do is try. Now if you are overweight (more than 150lbs) or have metabolic syndrome (large waist circumference) or are battling a health condition, then you will have to tell me so I can add to my suggestions.
We usually recommend an adult weighing 150lbs take 5000iu a day. This usually gives most people a level of 50ng/ml but this is why you should really get tested after 8 weeks to make sure you have reached that level. Now “regulating calcium, also helps manage sugar in your blood.” (I didn’t know that until I was reading the health topic listed above.) It is actually Vitamin D that helps absorb calcium from the intestines. The point is, without enough Vitamin D you can take a lot of calcium and have very little absorbed. The flip side is even if you have enough Vitamin D if there is not enough calcium in your diet, then that may make regulation difficult. There are not only diabetes studies but other studies that have combined Vitamin D and calcium and they get even better results then with just Vitamin D alone. That just goes to show that people’s diets probably do not contain enough calcium even though they think they do. (If you supplement do not get crazy with high amounts. I would do 500mg or less.)
I encourage everyone to read http://www.vitamindcouncil.org/about-vitamin-d/vitamin-d-and-other-vitamins-and-minerals/. In there it talks about magnesium. Most diets are woefully low in magnesium. So I googled “type 2 diabetes and magnesium”. I think you better gooogle that too. There is a connection.
So if you want to provide more information or have more questions, just ask!