I think obesity will always carry with it a risk for health problems. And according to a new study released on Monday, men with prostate cancer who are overweight have a higher risk of tumor recurrence after radiation treatment than thinner men do. Specifically, moderately and severely overweight men had a 70 percent higher risk of recurrence than men who were not overweight -- as indicated by rising levels of PSA, a blood protein that can signal prostate cancer. It is not clear how exactly obesity affects the success of radiation treatment -- perhaps it's the fat tissue that secretes certain hormones that helps the cancer progress at a later time. Regardless, the study suggests that men who are overweight do not fare as well as those who are at an average weight -- and this gives men a definite reason to trim down.

Obesity in this study was characterized by body mass index -- BMI -- a statistic that takes into account height and weight. A man five feet, 10 inches tall would be considered normal weight at or below 184 pounds. He would be overweight at 185 to 209 pounds, mildly obese at 210 to 244 pounds, and moderately to severely obese at above 244 pounds. Moderately to severely obese men had almost twice the risk of developing elevated PSA levels, according to an epidemiologist who led research in the study -- which will be published in the August 1 issue of the scientific journal Cancer.