A new study finds that a small number of people defy the odds when it comes to health risks associated with obesity.

Researchers from Finland studied 16 sets of twins in which one twin was obese, the other lean.

Half of the obese twins had increased insulin levels and elevated blood pressure.  But the other half were as healthy as their slim twin.

Researcher Jussi Naukkarinen,

What really separates the metabolically healthy obese from, let's say, the normal obese is the amount of fat these people carry in their liver.

Naukkarinen says the findings also suggest more exercise and less alcohol may play a role in being healthy while yet obese.