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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!

Should we avoid canned tomatoes and non-organic root vegetables?

Should we avoid canned tomatoes and non-organic root vegetables?

I’ve seen a number of blog posts about some food scientists stating that if you avoid ANY food, canned tomato products and non-organic root vegetables should be at the top of your list? Do you...

Should we take algae supplements for astaxanthin?

Should we take algae supplements for astaxanthin?

Is any research available on astaxanthin which seems to be touted as a wonderful antioxidant?

The dangers of fluoride (tap water fluoridation)?

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...

What about pepper plus turmeric in V8 juice?

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.

How much cinnamon is too much?

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...

Sulfite sensitivity from sulphur dioxide in 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...

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

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

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...

Are there foods that 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?

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