http://www.m.webmd.com/diet/tc/obesity-health-risks-of-obesity
How obesity affects your health depends on many things, including your age, gender, where you carry your body fat, and how physically active you are.
Risk for diseases
If you are obese and have unhealthy eating or activity habits, you have a higher risk for gallstones, type 2 diabetes, high blood pressure, high cholesterol and triglycerides, coronary artery disease (CAD), a stroke, and sleep apnea, among other conditions.
Children who are obese are at risk for many of the same long-term health problems.
If you have healthier habits or lose weight, your risk for these conditions is reduced.
Hope this helps!!