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


Celery for Colon Cancer Prevention

Should we avoid celery to prevent colon cancer?

Class participant heard that celery should be avoided for colon cancer patients. Only thing I’ve read about celery is to consume only ‘organic’ as conventional grown veggie is extremely high in pesticides. Do you know any other reason it should be avoided?...
Algae as Astaxanthin Supplement

Should we take algae supplements for astaxanthin?

Is any research available on astaxanthin which seems to be touted as a wonderful antioxidant? MarkB / Originally posted below Dragon’s blood Answer: Astaxanthin is the reason flamingos are pink (or at least flamingos in the wild). Astaxanthin is also the reason some...
Fluoride in Tap Water

The dangers of fluoride (tap water fluoridation)?

Dr. Greger, I have heard some talk about the dangers of fluoride. When I research this all I stumble upon are propagandists websites without scientific backing. Is there any truth to these claims that fluoride in our water supply and toothpaste is...
Powerful Pepper + Turmeric

What about pepper plus turmeric in V8 juice?

I stirred 1 teaspoon of powdered amla into my daily glass of V8 juice, along with a sprinkle of black pepper and 1/2 teaspoon turmeric – tasted OK. soupy / Originally posted below Amla: Indian gooseberries vs. cancer, diabetes, and cholesterol Answer: That’s...
Toxicity from Cinnamon

How much cinnamon is too much?

Does the anti-oxi value decrease with age of spice (or berry)? If so, how much? Second, how much is “toxic”? I heard taking more than 1-2 tbsns of cinnamon a day could be toxic. Is one hurting oneself if one takes 2 tbs...
Sulfite Sensitivity from Dried Fruits

Sulfite sensitivity from sulphur dioxide in dried fruits?

I eat dried fruits (prunes, raisins, apricots and now apples) daily. Please tell me your thoughts about what may be the cumulative effects on an aging body of sulphur dioxide preservatives used in processing fruits for drying. rosaleah / Originally posted below ...
Hibiscus Antioxidants and Iron Absorption

What Are The Health Benefits Of Hibiscus Tea & Is It Safe?

  My Daily Dozen recommends five daily servings of beverages (one glass or 12 ounces), and two of my favorites are hibiscus tea and my Hibiscus Punch concoction.   What Are The Health Benefits Of Hibiscus Flower? Antioxidants In a comparison of...
Food to protect teeth and gums

Are there foods that protect teeth and gums?

Do you have any advice on which plant foods or beverages can help prevent cavities and gum disease? OmarLittle / Originally asked on the NutritionFacts.org facebook page Answer: Normally we just hear about things to avoid to protect our teeth and gums (like candy,...
Tea and Iron Absorption

Can tea with meals hinder 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...

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