Doctor's Note

How much do doctors know about nutrition? Check out some of these related videos:

Please feel free to post any ask-the-doctor type questions here in the comments section and I’d be happy to try to answer them. And check out theupdate on doctors' nutrition knowledge. Also, there are 1,449 other subjectscovered in the rest of my videos--please feel free to explore them as well!

For more context, check out my associated blog posts: Cow’s Milk Casomorphin, Crib Death, and AutismPhysician-assisted suicide? When doctors give nutrition advice, and Protecting Our Babies From Pollutants.

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  • Michael Greger M.D.

    Please feel free to post any ask-the-doctor type questions here in the comments section and I’d be happy to try to answer them. And check out the update on doctors’ nutrition knowledge. Also, there are 1,449 other subjects covered in the rest of my videos–please feel free to explore them as well!

  • LouiseF

    This is so true! My boyfriend’s 38 year old Harvard Medical Schooled internist had never heard of the China Study!

  • jmerrikin

    Wow, this is something I have become acutely aware of in the last year. Now the BIGGEST challenge I have is finding firing my current doctor and finding a physician who is well educated in both naturopathic AND allopathic treatments, and will provide me with my preferred method of naturopathic nutritional advice!

  • Michael Greger M.D.

    Also be sure to check out my associated blog post Cow’s Milk Casomorphin, Crib Death, and Autism!

  • Cosmic_star7

    Is it ok to consume meat products that have zero animal fat in it? For example, chicken/beef broth or skim milk?

  • altVasile

    There is a php error that just poped up on your site:

    Warning: preg_match(): Unknown modifier ‘(‘ in
    on line 459

    • Michael Greger M.D.

      Thank you so much for letting me know–we’ll get it fixed right away!

  • Joe

    I have been a long time proponent of the science-based, low-fat, vegan diet, but it appears that at least the low-fat part has come under assault lately with the promotion of the Mediterranean diet. In doing more research it seems as though the link between saturated fat and cardiovascular disease is either tenuous, or small since the studies seem to be inconclusive. It seems clear that low-fat diets produce great results based on longitudinal studies, but those have so many confounding factors. What is the specific evidence against saturated fat and CVD?

  • Don T. Spamme

    Recently a friend posted/forwarded the following on Facebook,
    and since I could not find any mention of the plant on your website, I
    am hoping that you’d be able to shed some light on those claims:


    The Sour Sop or the fruit from the graviola tree is a miraculous
    natural cancer cell killer 10,000 times stronger than Chemo.

    Why are we not aware of this? Its because some big corporation want
    to make back their money spent on years of research by trying to
    make a synthetic version of it for sale.

    So, since you know it now you can help a friend in need by letting
    him know or just drink some sour sop juice yourself as prevention
    from time to time. The taste is not bad after all. It’s completely
    natural and definitely has no side effects. If you have the space,
    plant one in your garden.
    The other parts of the tree are also useful.

    The next time you have a fruit juice, ask for a sour sop.

    How many people died in vain while this billion-dollar drug maker
    concealed the secret of the miraculous Graviola tree?

    This tree is low and is called graviola ! in Brazi l, guanabana in
    Spanish and has the uninspiring name “soursop” in English. The fruit
    is very large and the subacid sweet white pulp is eaten out of hand
    or, more commonly, used to make fruit drinks, sherbets and such.

    The principal interest in this plant is because of its strong
    anti-cancer effects. Although it is effective for a number of
    medical conditions, it is its anti tumor effect that is of most
    interest. This plant is a proven cancer remedy for cancers of all types.

    Besides being a cancer remedy, graviola is a broad spectrum
    antimicrobial agent for both bacterial and fungal infections, is
    effective against internal parasites and worms, lowers high blood
    pressure and is used for depression, stress and nervous disorders.

    If there ever was a single example that makes it dramatically clear
    why the existence of Health Sciences Institute is so vital to
    Americans like you, it’s the incredible story behind the Graviola tree..

    The truth is stunningly simple: Deep within the Amazon Rainforest
    grows a tree that could literally revolutionize what you, your
    doctor, and the rest of the world thinks about cancer treatment and
    chances of survival. The future has never looked more promising.

    Research shows that with extracts from this miraculous tree it now
    may be possible to:
    * Attack cancer safely and effectively with an all-natural therapy
    that does not cause extreme nausea, weight loss and hair loss
    * Protect your immune system and avoid deadly infections
    * Feel stronger and healthier throughout the course of the treatment
    * Boost your energy and improve your outlook on life

    The source of this information is just as stunning: It comes from
    one of America ‘s largest drug manufacturers, the fruit of over 20
    laboratory tests conducted since the 1970’s! What those tests
    revealed was nothing short of mind numbing… Extracts from the tree
    were shown to:

    * Effectively target and kill malignant cells in 12 types of cancer,
    including colon, breast, prostate, lung and pancreatic cancer..
    * The tree compounds proved to be up to 10,000 times stronger in
    slowing the growth of cancer cells than Adriamycin, a commonly used
    chemotherapeutic drug!
    * What’s more, unlike chemotherapy, the compound extracted from the
    Graviola tree selectively hunts down and kills only cancer cells..

    It does not harm healthy cells!

    The amazing anti-cancer properties of the Graviola tree have been
    extensively researched–so why haven’t you heard anything about it?
    If Graviola extract is

    One of America ‘s biggest billion-dollar drug makers began a search
    for a cancer cure and their research centered on Graviola, a
    legendary healing tree from the Amazon Rainforest.

    Various parts of the Graviola tree–including the bark, leaves,
    roots, fruit and fruit-seeds–have been used for centuries by
    medicine men and native Indi! ans in S outh America to treat heart
    disease, asthma, liver problems and arthritis. Going on very little
    documented scientific evidence, the company poured money and
    resources into testing the tree’s anti-cancerous properties–and were
    shocked by the results. Graviola proved itself to be a
    cancer-killing dynamo.
    But that’s where the Graviola story nearly ended.

    The company had one huge problem with the Graviola tree–it’s
    completely natural, and so, under federal law, not patentable.
    There’s no way to make serious profits from it.

    It turns out the drug company invested nearly seven years trying to
    synthesize two of the Graviola tree’s most powerful anti-cancer
    ingredients. If they could isolate and produce man-made clones of
    what makes the Graviola so potent, they’d be able to patent it and
    make their money back. Alas, they hit a brick wall. The original
    simply could not be replicated. There was no way the company could
    protect its profits–or even make back the millions it poured into

    As the dream of huge profits evaporated, their testing on Graviola
    came to a screeching halt. Even worse, the company shelved the
    entire project and chose not to publish the findings of its research!

    Luckily, however, there was one scientist from the Graviola research
    team whose conscience wouldn’t let him see such atrocity committed.
    Risking his career, he contacted a company that’s dedicated to
    harvesting medical plants from the Amazon Rainforest and blew the

    Miracle unleashed
    When researchers at the Health Sciences Institute were alerted to
    the news of Graviola,! they be gan tracking the research done on the
    cancer-killing tree. Evidence of the astounding effectiveness of
    Graviola–and its shocking cover-up–came in fast and furious….

    ….The National Cancer Institute performed the first scientific
    research in 1976. The results showed that Graviola’s “leaves and
    stems were found effective in attacking and destroying malignant
    cells.” Inexplicably, the results were published in an internal
    report and never released to the public…

    ….Since 1976, Graviola has proven to be an immensely potent cancer
    killer in 20 independent laboratory tests, yet no double-blind
    clinical trials–the typical benchmark mainstream doctors and
    journals use to judge a treatment’s value–were ever initiated….

    ….A study published in the Journal of Natural Products, following a
    recent study conducted at Catholic University of South Korea stated
    that one chemical in Graviola was found to selectively kill colon
    cancer cells at “10,000 times the potency of (the commonly used
    chemotherapy drug) Adriamycin…”

    ….The most significant part of the Catholic University of South
    Korea report is that Graviola was shown to selectively target the
    cancer cells, leaving healthy cells untouched. Unlike chemotherapy,
    which indiscriminately targets all actively reproducing cells (such
    as stomach and hair cells), causing the often devastating side
    effects of nausea and hair loss in cancer patients.

    …A study at Purdue University recently found that leaves from the
    Graviola tree killed cancer cells among six human cell lines and
    were especially effective against prostate, pancreatic and lung
    cancers Seven years of silence broken–it’s finally here!!!


    A cursory search of the Internet seems to indicate that there is at
    least some truth to some of the above claims.


    But, as you can see, some of that information is somewhat dated. If you
    would be able to post detailed coverage of graviola, this might help to
    put some of the more spurious claims to rest while allowing your readers
    to identify the true benefits of the plant, if any.

    • Joseph Gonzales R.D.

      Thanks so much for reposting this question. I am not familiar with the plant, but it seems the potential health benefits are being exaggerated. For example, there have been no clinical trials conducted on humans from what I can find, so all we have are cell and animal studies, which cannot translate to humans. If interested in more research these studies mention graviola. I often see many studies or articles that claim there is a “miracle” fruit or plant in the universe offering protection from cancer, but the truth is all plant foods have their place. What’s important is loading up on a variety of foods. Incorporating a more plant-based diet assures the intake of an array of protective compounds that help fight cancer. I am not saying this plant is not healthful (I think I even tried it in Haiti last year and it was delicious!), but focusing on one food is not ideal for optimal health.