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Is it possible I’m not getting enough iron in my diet?

DEAR DOCTOR K: I'm a man in my 50s, and I've been feeling run-down. Is it possible I'm not getting enough iron in my diet? DEAR READER: Many patients ask me this question. I think it has to do with an...

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Can vitamin C boost your immune system and prevent colds?

DEAR DOCTOR K: Whatever happened to the idea that vitamin C can boost your immune system and prevent colds? DEAR READER: Vitamin C, also known as ascorbic acid, was promoted as a health supplement for...

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Can I take a supplement for my vitamin B12 deficiency?

DEAR DOCTOR K: I was recently diagnosed with a vitamin B12 deficiency. Can I take B12 supplements by mouth? Or do I need the shots? DEAR READER: Tissues throughout the body need vitamin B12, especially...

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Surprising number of conditions cause vitamin B12 deficiency

DEAR READERS: In yesterday's column I began to answer a reader's question about the different causes of vitamin B12 deficiency, and whether to treat them with shots or pills. Today, we continue a...

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Should I eat fish, or take fish oil supplements to prevent heart disease?

DEAR DOCTOR K: Heart disease runs in my family. Should I eat fish, or take fish oil supplements? DEAR READER: Eating fish regularly reduces a person's risk of sudden death from heart disease. It's also...

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What is pernicious anemia?

DEAR DOCTOR K: My new doctor recently told me I had pernicious anemia, that it had not been diagnosed by my old doctor and that his treatments would end my symptoms. What is pernicious anemia? DEAR...

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How much calcium do I really need?

DEAR DOCTOR K: I'm a 65-year-old woman. My doctor says my bones are strong, and he wants to keep them that way. So, for years I've been taking a daily 1,200 milligram calcium supplement. Now I hear...

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Should I take antioxidants?

DEAR DOCTOR K: It seems like several years ago all my friends were taking antioxidant pills. Now I don't hear about antioxidants as much. Are they worth taking? DEAR READER: Here's what we know, and...

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Do men need to take a calcium supplement?

DEAR DOCTOR K: Many years ago, my doctor told me that men, like women, should take calcium supplements. So I have been. Now I hear that it's a bad idea. What do you think? DEAR READER: All of us --...

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Should I take a potassium supplement?

DEAR DOCTOR K: I have high blood pressure. Should I take a potassium supplement? DEAR READER: This is a great question, but before I answer, let me take a step back to explain the connection between...

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