Mental illness - While it's impossible to guarantee the prevention of mental illness, you can significantly improve your mental well-being and reduce your risk by adopting a healthy lifestyle, including regular exercise, a balanced diet, sufficient sleep, and strong social connections.

Cancer - The best way to prevent cancer is by making healthy lifestyle choices: don't smoke, maintain a healthy weight, be physically active, eat a healthy diet rich in plant-based foods, limit or avoid alcohol, be sun-safe, get vaccinated for infections like HPV, and get regular cancer screenings. 

Heart Disease/Stroke - To prevent heart disease and stroke, make healthy lifestyle choices: eat a heart-healthy diet, stay physically active, maintain a healthy weight, quit smoking, limit alcohol intake, and manage stress. Regular check-ups with a doctor to monitor blood pressure, cholesterol, and blood sugar levels are also crucial. 

Diabetes - The best way to prevent type 2 diabetes is through lifestyle changes: maintain a healthy weight, be physically active for at least 150 minutes of moderate-intensity activity per week, eat a healthy diet rich in fiber and whole foods while limiting added sugars, processed foods, and unhealthy fats, and avoid smoking.