When a person is diagnosed with diabetes, what changes would one have to make in lifestyle and diet?

When diabetics are diagnosed, they would need to cut down on certain things in their diet, such as saturated and trans fat, and increase other foods in their diets such as healthy carbohydrates and heart healthy food.
In their lifestyle, they can exercise to help regulate their blood sugar levels. With regular exercise, they can lower many risks, such as high blood pressure and heart disease, as well as increase energy levels.