On call. I am a 68-year-old man with a question about my waistline. I had surgery for prostate cancer seven years ago, and my PSA has remained okay. My health is otherwise perfect. I work out at my health club every day at 6 a.m., and I eat a healthful diet. I'm six-foot-one and my weight is 180. My weight has not changed in the past 10 years, and I wear the same size 36 trousers as always, but my waist seems to bulge a bit more each year. What can I do to correct my potbelly?