Weight-reduction surgery lengthens lives and prevents clot-caused by a stroke in obese people says a study. Obesity is associated with a number of risk factors for heart disease and we know that bariatric surgery which alters the digestive system to induce weight loss - can help reduce these risk factors and improve their control. In this study we examined if bariatric surgery helps reduce stroke risk said Maddalena Ardissino co-lead author of the study and academic foundation doctor at the Imperial College London in the United Kingdom. The results of the study were published in the journal AHA Scientific Sessions