The Sunnybrook Type 2 Diabetes Study

This study is looking at the relationship between blood sugar problems and brain health in people who are at risk for or already have Type 2 diabetes. Researchers want to understand how blood sugar control affects the brain and whether lifestyle changes make a difference. **You may be eligible if:** - You are 18 or older and can communicate in English - You have been diagnosed with Type 2 diabetes, OR you have higher-than-normal blood sugar (pre-diabetes), OR your HbA1c (a blood sugar measure) is elevated **You may NOT be eligible if:** - You are pregnant - You currently have cancer - You have been diagnosed with bipolar disorder or schizophrenia - You have a neurological or neurodegenerative condition (such as Parkinson's or Alzheimer's) - You have a current or recent (within 5 years) substance use disorder (excluding nicotine) - You scored poorly on a basic memory and thinking test - For the brain scan sub-study: you have a pacemaker or other MRI-incompatible devices, or significant lung disease Talk to your doctor to see if this trial is right for you.