DEAR DR. GOTT: I am a 61-year-old woman with a history of breast cancer, parathyroid disease and knee problems. I had a lumpectomy for the cancer seven years ago, a parathyroidectomy five years ago and knee replacement last year. I have run in more than 60 marathons, so I am fairly active. However, since my lumpectomy and within the last two years, I have gained 20 pounds and weigh more than 180 pounds. I know this is too much, so I have been using your no-flour, no-sugar plan for the past six weeks. I have made big changes in my eating habits and, although not perfect, have been essentially true to the diet. I have also tried to exercise more — swim a half-mile, walk four to five miles, or bike for 45 minutes.
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