"Everything being equal, if you are happy and satisfied with your life now, you are more likely to be healthy in the future," Mohammad Siahpush, Ph.D., professor of health promotion at the University of Nebraska Medical Center in Omaha.

There are 29 confirmed cases confirmed caused by the listeriosis outbreak, while another 36 cases are still under investigation.

Last week, Eli Lilly & Co. and Amylin Pharmaceuticals Inc.'s diabetes drug Byetta has previously been linked to two deaths and four hospitalizations. All the patients are reported to have died after developing acute pancreatitis, the manufacturer said. The condition can cause nausea, vomiting and abdominal pain.

Excessive weight gain is elicited by alterations in energy balance, the finely modulated equilibrium between caloric intake and expenditure. But not all lifestyle factors count, as genetics factors also play a role.

The U.S. Food and Drug Administration (FDA) has lifted its advice to consumers to avoid eating jalapeo and serrano peppers grown, harvested or packed in Mexico.