Most likely the opposite in the vast majority of cases, as Type 1 diabetes requires constant attention to insulin requirements and carbohydrate intake to maintain blood sugar, leading them to be far more aware of their health and diet to survive. However, that's not what the commenter was asking. The commenter was trying to draw a link to a poor lifestyle and the development of Type 1, to which there is absolutely no link. Most people are diagnosed as children.

I mean, sure. Any chronic condition can and usually does impact the way a human lives their life. But the commenter was drawing a link between a "generally poor lifestyle" (I'm assuming they mean in terms of poor activity levels and food choices) and being diagnosed with Type 1 diabetes, where there is absolutely no link between the two.

Having a "generally poor lifestyle" has nothing to do with developing Type 1 diabetes. You're likely thinking of Type 2. In Type 1 diabetes, usually when you are relatively young, your pancreas ceases making any insulin. Lifestyle has nothing to do with it. In Type 2, your pancreas doesn’t make enough insulin, and the insulin it is making doesn’t always work as it should (can be related to an unhealthy lifestyle).