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Dear Dr. Roach: Are there any recognized benefits from taking either saw palmetto or glucosamine/chondroitin, both of which I have been taking — and paying for — for years. P.F.

Dear Dr. Roach: I read your recent column on prostate cancer treatments, and I must disagree on the differences between intensity-modulated radiation therapy and proton radiation therapy.

Dear Dr. Roach: I read your recent column regarding identical twins where one of the two was balding while his twin was not.

Dear Dr. Roach: I am a 76-year-old male who’s thinking of having fetal stem cell therapy for Parkinson’s disease. Please tell me your feelings and offer advice on this subject matter? S.C.

Dear Dr. Roach: How does a medical condition get named? Once named, can the name be changed (for example, Lou Gehrig’s disease, ALS)? I have a condition called hemiplegic migraines. It is rare and misunderstood.

Dear Dr. Roach: Can you send me a copy of your recommended low-carbohydrate diet? I have been trying to follow what I think it should be, but would like an expert to weigh in. K.H.

Dear Dr. Roach: I was diagnosed with nonalcoholic steatohepatitis and had very high AST and ALT numbers. I lost about 25 pounds, and the numbers were normal. As a result of other health issues, the weight came back and the numbers went up.

Dear Dr. Roach: A 74-year-old woman has a total cholesterol of 123 and was told that low cholesterol like this greatly increases the risk of diabetes, stroke and cancer. It seems she has had low cholesterol for many years.

Dear Dr. Roach: I am a 72-year-old man. I thought I was in excellent health until I was diagnosed with atrial fibrillation in a routine physical exam with an EKG about six months ago. I was and continue to be asymptomatic.

Dear Dr. Roach: I am a 53-year-old woman, and I weigh 190 pounds. A year and a half ago, I had gastric sleeve surgery. I have lost 24 pounds. I have been diabetic since about 2013. At my last blood analysis, in August 2018, my A1C was 6.