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: Do microgreens have more nutrition?

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What about microgreens? vetstud  / Originally Posted in Antioxidants Sprouting Up Answer: USDA researchers recently published a study assessing the nutrition content of 25 commercially available microgreens, seedlings of vegetables and herbs that have gained popularity in upscale markets and...

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Q: Any update on the scary in vitro avocado data?

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any updates on avocados in vivo? Toxins  / Originally Posted in Are Avocados Bad for You? Answer: I’m happy to report that a new study this year found avocado consumption associated with significantly reduced prostate cancer risk (a third cup of avocado a day or more associated with 60%...

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Q: What do you drink, Dr. Greger?

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Dr. Greger ~ Are you still drinking that yummy Hibiscus Tea? (I did not see it in your “morning mix”!) Kenton R. Mullins  / Originally Posted in A Better Breakfast Answer: A half gallon a day Kenton! I no longer do the teabags, though, but the bulk dried hibiscus flowers themselves...

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Q: What are “normal” human vitamin D levels?

Gossiping and sunbathing on the beach

With a “built in” SPF of 15 what blood level of Vit D does the lifeguard of African descent attain? Perhaps that is a better clue for evolutionary “normal”.

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Q: What do you think of durian fruit?

Durian Fruit

Dr. Greger, have you ever eaten a durian fruit? They are so fascinating, though I’ve never seen a real one.

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Q: Are neurotoxins only present in blue-green algae?

Fish Oil Capsules

As you have reported, the effects of animal based omega-3 supplements can prove to be ironically, inflammatory. While you recommend utilizing algae as an alternative, is there concern over the neurotoxins (as you have discussed in other videos as present in spiralina), or are these only present in...

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Q: What are the benefits of reishi mushrooms (Ganoderma lucidum)?

Green Tea with Red Mushrooms

I have just been introduced to a product that is a combination of green tea and ganoderma (a red mushroom). It also comes mixed with coffee. I was wondering if you have seen amy research on ganoderma. Thank you so much for this website. It is wonderful!

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Q: What about gurmar, jamun, bitter melon, and fenugreek?

Gurmar, Jamun, Bitter Melon, and Fenugreek

What is your take on the following substances? Gurmar…jamun… bitter melon…[and] fenugreek? Lastly, Dr. Greger what do you think of Citruline and L Argenine in their role as helping out in repairing the endothelium cells ( Citruline ) and the later helping in promoting Nitrous Oxide...

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Q: Is yerba maté tea really bad for you?

Is Yerba Mate Bad

Whoa! Really?! It seems there must be a lot of problems for the South Americans who consume loads of this daily? I haven’t read anything negative — any other info on how this is affecting people who have been drinking it for years?

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