Since obesity is a known cancer risk factor, it makes sense that losing excess weight can help reduce cancer risk. Now a Canadian team has discovered that morbidly obese people who undergo weight-loss surgery slash their cancer risk substantially. Scientists at McGill University looked at data from 1,035 people who had the surgery at the university’s hospital over 16 years and compared it with data from more than 5,700 obese patients who didn’t go under the knife. The surgery patients experienced 85 percent fewer breast cancers and 70 percent fewer pancreatic and colon cancers. Incidences of other cancers were lower as well. Scientists say it’s possible obese people are more susceptible to cancer because extra body fat may increase certain hormone production.