To make things more ugly, fat women are driven to comfort eating, thanks to stressful life events, which in turn makes them more fat.
To reach the conclusion, the study, carried out by the Department of Psychiatry at the University of Connecticut in America studied 41,218 adults who had completed detailed records of their lives in which each had kept a year-long diary showing when they had suffered the most stress.
The results showed that those who were obese experienced more 'stressful life events'.
The study has been published in the journal Preventive Medicine.
According to the study, obese women were more likely to face the death of a friend or relative, be sacked or made redundant or face financial troubles.
In the study, obese men did suffer more than slim men, but the difference was much greater in women.
"Stress can lead to obesity. But the opposite is also true with the seriously overweight suffering the most stress by contributing to poor health or social factors like workplace discrimination," the Telegraph quoted researcher Nancy Petry, as saying.
On the up side, the study did show that overweight women in relationships were less likely than slim women and all men to break up from a long-term partner or get divorced.