Ok first of all. You don't develop diabetes from eating a) too much sugar b) eating too much food. You develop diabetes from a combination of insulin absorbtion problems and a lack of insulin for your body weight (When you're large you need more, body can't produce the amount needed, and also, fat increases the amount of insulin required for the same amount of glucose reduction as if you weren't fat. ) This is called type II diabetes, you can as well get this via old age which is simply partial organ failure (insuling is produce by some rather fragile cells in the pancreas called islets of langerhan. They are subject to being weakened and made dysfunctional with age. Type II diabetese is Incedental diabetes and the majority of cases are due to being overweight, not exercising enough, and just generally being a fatty mcbutterpants and eating all the wrong crap. Just cos you eat fastfood daily wouldn't even be enough, it would be the combination of all your health malpractices. I'm a type 1 diabetic (the cause is idiopathic, (unknown) however it is believed that we have a predisposition as our islets of langerhan looks similar to a virus that uses this to its advantage, once our body realizes this and responds, it decides to nuke our insulin production system. No amount of dietary control/weight loss would help. Again nothing caused this but a bad deal of the cards. I've been Type 1 Diabetic since I was 11, I'm 5'7" and weigh 170lbs with about 8-10% body fat index.
As for seatbelts. As a former EMT I will express my love of the requirement of seatbelts. All the old wives tales and urban legends about "seatbelts killing someone" are utter crap, sure they've been the primary cause of trauma, but what isn't stated in these cases is that a force that is intense enough to damage you to that extent via the seatbelt would splatter you without one. It's just a 0% survivability chance in most of those cases. I can also assure you that I'd approximate 1 our of every 200 car fatalities I scraped up off the highway were buckled, the other 199 were not.
Lastly, what people don't realize is how DANGROUS of a missile you become at 50mph and above, to passengers in your vehicle. I've seen many people killed by incidental traumas caused by secondary impact of the unrestrained passenger into the restrained passenger. usually both die in this case. So to relieve the burden on your tax dollars to pay for the public EMS transit / medical care / etc just in that light, the seatbelt law is needed. You don't just endanger yourself, you endager all who are in the car with you. As such I won't ride with anyone in my vehicle unrestrained. I've seen what it does, over and over and over. I still have some rather bad dreams concerning car wrecks. Its for the better.
