Although the risk of developing diabetes, hypertension and coronary artery disease is very high among overweight and obese people, once the coronary event had occurred and had been treated, the overweight/obese patients have better prognosis in comparison to patients with normal weights.

Researchers from Germany and Switzerland followed over 1,600 patients who had been admitted to hospital suffering from unstable angina/non-ST-segment elevation myocardial infarction.

Eighteen percent of the patients belonged to a obese category, half were overweight and one third had a normal BMI.
The obese were younger, very likely with diabetes and hypertension but less likely to have suffered an earlier heart attack. They were also released earlier from the hospital after the proper treatment.
When it comes to mortality, the follow-ups showed that 9.9% of normal BMI patients and 7.7% of overweight patients had died at the end of the three years while only 3.6% of obese patients had died and no very obese patients had died.

Unfortunately, this study was limited to describing the association between obesity and improved survival, but not to show what might be causing it. Further research is planned to determine the causes.