Ask the Doctor: Q&A with Dr. Greger

Answers to featured health and nutrition questions provided by Michael Greger M.D. Questions are taken from the video and blog comments throughout the site. Join in the discussion and get your question featured!


Q: Would too much hibiscus tea be toxic due to iron content?

Hibiscus Antioxidants and Iron Absorption

According to the USDA Database, an 8 fl oz (237g) serving of hibiscus tea has 20.48 mg of Iron, while the RDA for a male is 8 mg with an upper limit of 45 mg. Furthermore, apparently the Vitamin C in the drink itself or added to increase the antioxidant content tends to increase the absorption of...

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Q: Can tea with meals hinder iron absorption?

Tea and Iron Absorption

This is a bit unrelated, but I eat a plant-based diet. I’m also a 20-something year old woman of child bearing age who runs, so making sure I’m getting enough iron from plant sources is important to me. I’ve heard that tannins in coffee, tea, and chocolate can hinder the adsorption of iron...

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Q: What are the best sources of vitamin K?

Vitamin K in Leafy Greens

I have read in a magazine that there are several types of vitamin K. According to the article, Vitamin K1 is found in vegetables. Vitamin K2 mk7 is found in meat, fish and eggs. The article also said that Vitamin K1 is stored in the liver for only one hour, time not enough to perform all its tasks....

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Q: Any resources for vegan pregnancy, infancy, and childhood?

Vegan Pregnancy, Infancy, and Childhood

I feel our family has a healthy and complete diet (in no small part thanks to you!) but do you have any specific recommendations or guidelines for those who would like to follow a vegan diet through pregnancy, infancy and childhood? Is the most important thing (apart from healthy, whole foods)...

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Q: Dairy and ear infections: is there an association?

Dairy and Ear Infections

Hi doc. Any research studies on dairy consumption and ear infections in children. My friend’s child had numerous ear infections and I recommended soy milk instead of cows milk plus to eliminate cheese, ice cream, etc. She asked a chief pediatric ENT at a big hospital who of course said there is...

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Q: Is moringa (Moringa oleifera) good for you?

The Health Benefits of Moringa

A booth at our farmers’ market is selling moringa. It is a nutrient based plant, exceptional supplementation. It is touted to be “nature’s perfect food.”. Opinions please.

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Q: Might flax seeds (ALA) increase prostate cancer risk?

Flax and Prostate Cancer Risk

There are a lot discussions and articles online about the supposed connection between flax seeds (ALA) and prostate cancer – suggesting that more flax consumed = increase chance of prostate cancer. I haven’t found this issue addressed on your website (sorry if I missed it). Can you comment?...

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Q: Is raw milk healthy?

Hormones in Raw vs. Pasteurized Milk

What about Raw Milk? I know the general arguments against milk as ‘Toxin’ cites above, personally I am a vegan, but what is the actual research on Raw milk vs pasteurized milk. I work in the area of local food and farmers markets and I am exposed to vegetarians and omnivores that are big...

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Q: Can hibiscus tea cause coughing?

Hibiscus Tea, Blood Pressure, and Coughing

An FYI. My mother used to take Lasinopril (sp?) for high blood pressure. It gave her a terrible dry cough and she quit taking it. Then I read hibiscus tea was good for high blood pressure and bought her tea where hibiscus was the 2nd ingredient. Then one day I found one where it was all hibiscus...

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