How can i help prevent my overweight child from getting diabetes mellitus type 2?

See below: The best method, and most important is weight loss. Which needs to accomplished through a proper diet and regular aerobic exercise. Other than those, there are no other preventative options.

Weight loss: The best was you can prevent your child from developing diabetes is to help them lose weight and return to a normal weight for their age, sex, and height. Controlling their diet and encouraging regular physical activity will help with this.