Hello and Welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice. You did not provide detailed information. Let me review some variables. First, how much weight are you worrying about and over what time period? As we age, the body s natural tendency is to lose muscle. Muscle weighs more than fat and in men they may see this as a drop in body weight. As we age, we should keep up with the exercise adding strengthening exercises and a little extra lean protein to keep our muscles in shape. I don t like to assume, but are you taking pancreatic enzymes to aide in digestion? Are you having any problems with digestion or your stools? Some doctors will prescribe these enzymes after a distal pancreatectomy. You asked about insulin. Do you have a family history of diabetes as this would add to your risk. There is a small risk of developing diabetes after this operation. To alleviate your fears, why not have your fasting blood sugar and HbA1C checked? Since your pancreas does produce insulin, a small possibility exists there may be blood sugar issues. In the meantime, it would be a healthy move to cut out added sugar in your diet. In the US, we recommend that each adult male should not consume over 9 teaspoons or 36 grams of sugar daily (non-diabetic). One teaspoon of sugar is about 4.2 grams. Hope I have answered your query. Let me know if I can assist you further. Regards, Kathy Shattler