Over time, this can damage cells in the pancreas. Eventually, the pancreas may not be able to produce any insulin.

If you don’t produce enough insulin or if your body doesn’t use it efficiently, glucose builds up in your bloodstream. This leaves your body’s cells starved for energy. 

Can damage kidneys, nerves, and eyes.

3.9 million people are currently living with a diagnosis of diabetes, and 90% of those with type 2. In addition, there are almost a million more people living with type 2 diabetes who don’t know they have it because they haven’t been diagnosed yet, bringing the total number up to more than 4.8 million.
 

https://www.nature.com/scitable/topicpage/g-protein-coupled-receptors-pancreatic-islets-and-14257267/
https://www.who.int/news-room/fact-sheets/detail/diabetes
https://www.healthline.com/health/type-2-diabetes#risk-factors 

https://www.diabetes.org.uk/resources-s3/2019-04/Diabetes%20UK%20Tackling%20the%20Crisis.pdf?

He said that:  people with Type 2 diabetes produce an abundance of insulin in response to an environment that allows them to ingest more calories than ever before without many physical demands, such as walking, cycling, and physical work, while leading a rather inactive lifestyle sitting at a desk. This combination of excessive amounts of calories coming in and a paucity of calories going out leads people to gain weight and become obese. We have seen this imbalance in the developed world since the 1930s, leading to the rapid rise of Type 2 diabetes in the 1980s and 1990s. But now also in the developing world, the amount of high caloric food that some people eat far exceeds their requirements and so the epidemic is spreading

Physical exercise helps lower your blood sugar level. You should aim for 2.5 hours of activity a week.

You can be active anywhere as long as what you're doing gets you out of breath.

This could be:

Screening:
If you are aged between 40 and 74, you are eligible to receive an NHS Health Check, which checks for the presence or risk of type 2 diabetes and other common long term health conditions.
A screening test is advisable if you have any of the symptoms of diabetes, such as frequently needing to urinate, increased thirst or persistent lethargy. 
Diabetes screening tests are also advisable for people with a number of risk factors for type 2 diabetes such as being overweight or obese, having a close family member with type 2 diabetes or being of African-Caribbean, Middle Eastern or South Asian origin.