Personally I believe almost everything is genetically linked. With something like Type-2 diabetes there may be people that are more susceptible than others but it seems relatively curable through diet.
The American Diabetes Association (ADA) states that type 2 diabetes has a stronger link to family history and lineage than type 1. It goes on to say that studies of twins have shown that genetics play a key role in the development of type 2 diabetes.
The ADA also advises that race can also play a role, and research Trusted Source indicates a higher prevalence among Asian, Black, and Latino people. But this may not be entirely due to genetics.
Environmental factors such as diet and lifestyle also influence the risk of developing type 2 diabetes. The ADA notes that it is possible to help prevent type 2 diabetes by exercising and reaching or maintaining a moderate weight.
There can also be a genetic role in obesity, and families often develop similar eating habits. This can put someone with a genetic predisposition at more risk for developing type 2 diabetes.Is type 2 diabetes genetic? Causes, genes, and prevention (medicalnewstoday.com)