What does the term prevention mean in relation to health?

Stephanie has a bmi of 27 kg/m2, her waist circumference is 37 inches, she has a healthy blood pressure, her blood lipid values are normal, her blood glucose level is slightly elevated, her father had a heart attack at 53 years of age, she walks 20 minutes daily 5 days per week, and she does not smoke. stephanie is likely to improve her health by losing weight.t/f