Obesity doesn't have a direct linkage of behavior. It can occur for many reasons suchas lifestyle, hereditary, overeating, and not having a eating/ moving balance. Obesity mainly occurs when their is an imbalance and a person is intaking more calories through food than they are letting out through physical activity. But obesity can also just be normal for certain families that have bigger body muscles or features than is expected. Most of the time you can differentiate between lazy obesity and natural obesity.