The World Health Organization has declared obesity to be a global epidemic that “threatens to overwhelm both developed and developing countries.” However, is obesity always bad when it comes to health?
Certainly, obesity is a significant risk factor for the development of many chronic conditions, including heart disease. However, research has shown that in a number of situations, being overweight may actually be of benefit. This phenomenon has been called the “obesity paradox.”
Our group from the departments of public health sciences and anesthesiology and perioperative medicine at Queen’s University investigated the relationship between body mass index (BMI, a commonly used ratio of weight to height) and outcomes after heart surgery. We analyzed a large database of health records of almost 80,000 patients having open coronary bypass surgery in Ontario over a 13-year period using data from ICES, a not-for-profit research institute in Ontario. We tracked five-year survival rates as