Doctor's Note

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. Be sure to check out all the videos on heart disease, as well as the videos on nutrition myths. And don't forget, there are 1,449 subjects covered in my other videos–please feel free to explore them!

For more context, check out my associated blog posts: Eating To Extend Our Lifespan, Preventing and Treating Kidney Failure With DietHeart Disease: there is a CureIs Coconut Oil Bad For You?Industry Influence on Dietary GuidelinesTreating Breast Pain with Flax Seeds, and Top 10 Most Popular Videos from 2013

  • 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. Be sure to check out all the videos on heart disease, as well as the videos on nutrition myths. And don’t forget, there are 1,449 subjects covered in my other videos–please feel free to explore them!

  • BPCveg

    Thanks for another excellent video, Dr. Greger!
    I agree that the tomato effect – or dogmas, in general – are at the core of why less than 5% of people in North America have embraced vegetarianism, despite enormous scientific support for plant-based diets. One example of non sequitur reasoning that I’m sure you will recognize, goes something like:

    1) we have been eating meat for eons as proven by the anthropological record;

    2) therefore, we have evolved to eat meat and require it.

    Hmm…maybe if the discredited theory of Lamarck had been proven true, but #2 does not follow automatically according to the well supported model of Darwinian evolution.

    Yet meat proponents as sophisticated as Michael Pollan will suggest that following the current science of nutrition, pejoratively referred to as nutritionism (, will lead people astray. Instead they suggest that we should use common sense intuition to eat according to the pattern of our ancestors.

    I feel that even rather rational people, with limited time to explore the literature, would buy into flawed arguments, like the above, and ultimately avoid vegetarianism.

    • 2RHealth

      It is certainly an educational challenge to make major changes in the way people view the foods they eat. In my reading of Michael Pollan, I was understanding his mantra of “Eat food, mostly plants, and not too much,” is certainly advocating for a plant based diet as the primary food source. Although he may eat meat, his writings, seem to clearly decry the traditional western diet and the “food industry”.

      As he says in his “Food Rules”, Eat foods from plants, not food made in plants.

      • BPCveg

        I feel that ‘Mostly plants’ does not say much since most people of the world, including those from developed nations, already get most of their calories from plant sources. The food balance tables ( provide ample support for this.

        In his ‘Six rules for eating wisely’ (, I think Pollan sums up his attitude when he writes: “The more I learn about the science of nutrition, the less certain I am that we’ve learned anything important about food that our ancestors didn’t know.”

        Concerns about the sincerity of Pollan’s support for vegetarianism have been well-covered elsewhere, including: (

        • 2RHealth

          I would agree that the majority of the world has historically obtained the majority of calories from plant sources. The problems facing us here in the USA are we have really made a shift in the last century and it has been detrimental to our health.

          Pollan’s statement about nutrition is one I took as a critique of our reductionist approach, basically we have been taught to look at eating nutrients rather than whole food. Although being concerned about nutrients we need or don’t need can be helpful, most of the research seems to show eating whole foods is most beneficial.

          I am not too concerned about Pollan’s personal philosophy and whether he eats meat or not. I find his writing stimulated my own thought about what I eat – so his writings have been beneficial to me!

          concerned about Pollan’s sincerity

          • BPCveg

            Nicely said! … I agree with you that Pollan makes an excellent point about the nutritional value of whole foods, which is well-supported by current research. If he is inspiring others to think more critically about the food they eat, then he is making a valuable contribution.

            Thank you.

          • Dirty Cyclist

            I started down my healthier path by just adding 3 pieces of fruit a day to my diet. Then I started reading and adding more veggies, then less sugar, then less meat and so on. Pollen’s writings have helped me along with Furman, McDougle and Gregers. It’s good to not forget that we all start in different places and most people can not go from the Standard American Diet to a vegan diet in one swoop…

          • BPCveg

            I’m amazed by how much some vegetarians love Michael Pollan!

            If you doubt that Pollan is a meat-proponent, come talk to me after you watch the The Oprah Winfrey Show: Oprah and 378 Staffers Go Vegan: The One-Week Challenge (Feb 1st, 2011) where Pollan goes head to head with the veganist Kathy Freston and even remarks in his backstage appearance that “meat is a perfectly nutritious enjoyable food…its not like you’re hurting yourself eating meat”.

            Pollan’s scientific errors and anti-vegetarianism have been well documented on Adam Merberg’s blog ‘Say what, Michael Pollan’.

            Most amazing of all is why anyone would take dietary advice from an english major who has no scientific credentials!

          • Larry G Maloney

            An English major writes books. Researchers publish papers. Which has the greater readership?

          • Larry G Maloney

            Mostly, we aren’t SOLD whole foods. Instead we are marketed concoctions based on nutritional claims.

        • Larry G Maloney

          It’s obvious our ancestors knew what to eat. They weren’t influenced by mass media. They grew it or foraged it. They didn’t pick it up at the grocery. IF, and that’s a big “IF”…if grocery stores only sold what was grown a few hundreds of years ago, the masses (in the USA) would know even today what our ancestors knew. Imagine Thomas Jefferson or Ben Franklin going to and American super market. They couldn’t find the food. They’d read the ingredients on the package and think we’ve all gone mad. Maybe we have!

    • Larry G Maloney

      Most Americans don’t know who Pollard is. They DO know who Dr.Oz, Rachael Ray, Rush Limbaugh, and a plethora of other media spokesperson’s are who mislead the masses. The masses hear their message daily. They don’t hear evidence based nutritional news (science) with few exceptions. American’s are conditioned to expect recipes for serving bacon with burgers and greens drowned in oil and Greek Yogurt. They snicker at any attempt to change the status quo. They are afraid to confront their doctors; instead they meekly take all the prescriptions to hide disease symptoms. In short, Americans are indoctrinated by the hidden food police, big business, who powerfully, through lobbyists and threats of economic downturn, sway politicians to not only support, but promote meat and dairy consumption. Had Pollard never been born the same epidemic of nutritional ignorance would exist today. Vegan proponents tape up one debate after the another to refute the latest meat and dairy diet nonsense. Meanwhile, it’s business as usual. The masses don’t have a lobbyists. We debate the science when the war is a political one. Unfortunately, polite doctors are armed with evidence based science while politicians are obliged to listen to their backers, big business. We are so entrenched in the meat and dairy consumerism-based economy we won’t risk change. Instead of independent men growing their own food, as a nation, we rely on the food police to not only tell us what’s right to eat but they sell it to us too. Billions of dollars worth. Polite doctors armed with evidence are no match for shrewd marketers who already have consumers convinced it is the evidence based doctors who are the food police. American’s therefore resist influence by facts. They instead die taking their pills.
      Americans, “meat and dairy” eaters, believe they must have meat and dairy to be healthy. They believe eating vegan means living on salads and cooked vegetables. They can’t imagine how anyone can endure that. They don’t have a clue it’s easy to fill up on starches and never bee hungry, even eating a small amount of calories. They don’t believe it because the message is seldom said. When media does say something like, Research proves that adults drinking three glasses of milk daily have significantly more hip fractures than those who only drink one. One, or more reporters scoff at the news saying THEY believe otherwise. Clearly this country lacks ethical journalism, responsive government, and honest business owners. By default, American men allows others in government and business to make health decisions for their families. It’s metrosexual to the extreme. Instead of a father saying, I’ve come to realize milk and meat are harmful to my children”, he instead, says, “Who wants KFC tonight and who wants McDonalds?” The problem will get worse before it gets better because Americans are so much more connected by media and not by family. Our government will change policy distribute the truth when we are too unhealthy to compete in the word and can’t afford medical treatments. Until then it’s a David and goliath war and most don’t even know David is in the fight.

  • JJ

    On one hand, you have people like the doctor in this video who educated himself and then felt compelled to go vegan.

    On the other hand, you have people like my morbidly obese, diabetic co-worker who takes pride in never eating vegetables, who can’t stand to go a day without a burger or two, and who would rather die than change her eating. I lent her Dr. Bernard’s book on Reversing Diabetes. She read it just far enough. She said she returned it to me before getting to the end because she knew that she would never make that change. She didn’t deny the science. She didn’t say everything is going well for her on her current path. She only said that she isn’t willing to eat healthily.

    Even my parents, who have listened to a lot of nutritional information and don’t really doubt it’s validity, are not willing to do much change.

    So, on one hand, we do need the medical community to wake up. On the other hand, I suspect that there are a large number of people who won’t change no matter what the medical community says. It may not be too late to help the kids. But I suspect that it is way too late to help most adults. Us adults outside the medical community all have our own tomato affect going on.

    • Toxins

      The people who don’t care for their own body’s health has always baffled me

      • Dirty Cyclist

        It could be like smoking where once the tide really started to change, people did stop smoking.

        • Jackie Thomas

          Well, I think it was not health issue, it was higher taxes, higher price for cigs, 2nd hand smoke issues causing no smoking at desk, etc.

    • Larry G Maloney

      “They” changed from an agrarian society to a money incentive, mass marketing society over generations. As long as big business can profit from dumping unhealthy food substitutes on Americans and Government condones it, why change? The masses simply don’t know any better. Eighty percent of the population are dependent on an authoritarian figure to make decisions for them. Advertisers do so gladly.

      • Jackie Thomas

        Govt not only condones it, govt is a major advocate, not the peoples’ advocate. FDA, etc. is “owned” by big pharma, etc. Well, maybe not “owned”, but certainly $ are involved.

    • Jackie Thomas

      JJ, my mom died from body cancer, originating from lung cancer, my dad from heart disease. Both were heavy, heavy smokers for years. After my dad’s last heart attack (they couldn’t even do bypass because he didn’t have enough vein left in his leg and no heart muscle to attach it to anyway) and STILL neither would stop smoking. Mom was young, 64, my dad, patched up twice with bypasses, survived a bit longer. Not a good life. So, it’s not only the food…

  • Eric Needs

    This was fantastic. More videos like this please. We need rhetoric like this so vegans can properly defend themselves.

  • Sonali

    Do you have a presentation on gout?

    • DrDons

      Dr.Greger hasn’t done a specific video on gout. Gout is associated with higher blood uric acid levels. Increased consumption of meat, poultry and fish result in higher or uric acid. People getting most of their protein from plants have lower uric acid levels. I have had patients markedly decrease the number of gouty attacks or eliminate them altogether by going a a whole plant food based diet. Low fat dairy has been shown in men to decrease uric acid but you can’t recommend dairy because of its association with other diseases plus all the other non health arguments unnecessary suffering and environmental concerns. Go to browse all topics and click on Dairy for a number of excellent videos on the effects of dairy.

    • DontGetIt

      I’ve been on a low fat vegan diet for 14-months – many health improvements including the elmination of gout-like symptoms. Went from a frequent sufferer to worry free in about a month!

  • Jan-Kristian Markiewicz

    Another one: The fact that cleaning your hands would prevent the spread of disease was ignored and ridiculed for about 50 years…

    Semmelweis reflex:

    • Michael Greger M.D.

      Oh that’s a great example! Everyone should know about Ignaz Phillip Semmelweis. Quoting from the Proceedings of the Royal Society of Medicine: “Many men have been endowed with clear intellects and hearts full of love for their fellow men, with the enthusiasm of humanity, and they have been enabled to achieve some signal service for the human race in their day and generation; but in the whole history of medicine there is only one Semmelweis in the magnitude of his services to Mankind, and in the depths of his sufferings from contemporary jealous stupidity and ingratitude.”

      Let me set the scene:

      The year was 1846. The place, Viennese General Hospital, the largest of its kind in the world. Semmelweis gets a job as obstetrical assistant. He notices that three times as many women are dying at the hands of the medical students than at the hands of the midwifery students from puerperal fever, commonly known at the time as, “the black death of the childbed.” Semmelweis describes: “In the medical school division the mortality from puerperal fever was so terrifying that this division became notorious….There were heart rendering scenes when [pregnant] patients knelt down, wringing their hands, to beg for a transfer [to the midwifery division]….”

      Why the discrepancy? The food and ventilation was the same in both divisions. If anything, surgical skill was better in the medical school and overcrowding less. The idea at the time was that the excess mortality was due to the emotional strain of being examined by male students, since the midwives were all female. So the elders of the Medical School met in council and proceeded to exclude the foreign students from the hospital on the ground that they were, “rougher in their examination than the Viennese.” Death rates didn’t change.

      Before Lister, before Pasteur, Semmelweis made the connection between the autopsies the medical students were doing and the, “examining finger which introduces the cadaveric particles.” In May 1847 he required every medical student to wash his hands with a chlorine solution before making an examination and the death rate plummeted. For the first time in the history of the Vienna Hospital, the mortality rate at the medical school fell below that of the school of midwives.

      Knighted, no doubt, for the discovery of the century? Hardly. Historians believe his doctrine was unpalatable to colleagues since it implied that the obstetricians were the cause of death. He shared this knowledge with his superiors. From the Proceedings: “The suggestion was unheard of! Indeed, it was sheer impertinence to suggest that the Accoucheur to the Imperial household should carry contagion upon his hands.” Semmelweis was summarily dismissed.

      So he lectured, he wrote papers; he continued to be ridiculed. Doctors regarded antisepsis as a poor joke. His successor in Vienna publicly stated that the doctrine was, “discredited and universally rejected.” Semmelweis wrote a book, The Cause, Nature, and Prevention of Puerperal Fever, expecting it to save thousands of lives, but it was ignored.

      So he turned from academics to polemics. He started to publish open letters to midwifery professors. “Your teaching… is based on the dead bodies of… women slaughtered through ignorance. If… you continue to teach your students and midwives that puerperal fever is an ordinary epidemic disease, I proclaim you before God and the world to be an assassin….”

      By the summer of 1865 he had taken to the streets of Budapest thrusting circulars into the hands of startled pedestrians. “The peril of childbed fever menaces your life! Beware of doctors for they will kill you…. Unless everything that touches you is washed with soap and water and then chlorine solution, you will die and your child with you!”

      Semmelweis, at the age of 47, the father of three young children was committed to an insane asylum in Vienna. He attempted to escape, but was forcibly restrained by several guards, secured in a straight jacket, and confined in a darkened cell. The asylum guards beat him severely.

      Quoting from the Bulletin of the History of Medicine, “He was not in the asylum for long. Thirteen days after admission he was dead.” From the autopsy report: “It is obvious that these horrible injuries were… the consequences of brutal beating, tying down, trampling underfoot.”

      • 1morcker

        This story is very telling. It shows how far people will go to keep their blinders on when the truth threatens their self-image or their entrenched way of life no matter how unfounded.

      • Sooz

        WOW :-(

      • apprin

        Sounds like ancient Obamacare to me.

        • Graham

          Oh, please.

  • Tony Wright

    If you dig a little deeper you find the cause of dogma and stupidity is also a chronic deficiency of complex plant biochemistry.

  • working at it

    Dr. Greger, your website is a treasure; thank you.

    On a personal note: I have IBS, and am following Dr. Barnard’s advice on conducting an Elimination Diet to identify potential triggers. Tomatoes, it turns out, really are poison for me. In fact, many foods that have much to recommend them cause problems for me……wheat, oats, onions, tomatoes, squash…… Sometimes I get excited about something you discuss on a video, but evenutally find that I have to avoid it, if I want to feel good.
    Again, thanks for the information you provide; it’s wonderful.

  • Michael Greger M.D.

    For some context, please check out my associated blog post Heart Disease: there is a Cure!

  • Karen A

    It really is frustrating to have the weight of culture against you. Having been vegetarian for 23 years and vegan for 14 years, I’m an “extremist”. That I’d 3 major chronic health problems by the age of 15 which have probably been kept to some extent in check by diet, several years BEFORE going veggie doesn’t stop the comments that I’d feel better if I ate some meat.

    And worst of all is the argument that, “There’s no point to life if you don’t enjoy it while you can”; pointing out that it’s easier to enjoy life when you don’t have major health problems doesn’t cut it.

    As a young person, I tried angry outright argument when provoked; then I turned to refusing to discuss it; then I went through a phase of being cheerily fact-based and then changing the subject. Now I’m mentally noting the videos and articles on this site most likely to get emailed next time a member of the family and social circle complains about their asthma/gout/rheumatoid arthritis/type 2 diabetes/high cholesterol/high blood pressure, or asserts that soya products will make them infertile/less manly/gay/die from breast cancer. There’s something about a good-humoured short graphical representation by an MD specialising in clinical nutrition that packs more of a punch than “extreme” claims by someone you know. You’ve made my life a lot easier.  And how much do I love your video on cocoa solids as a treatment for chronic fatigue? – there are no words!

    • Sooz


  • EC

     Great Website! Is it true that the consumption of ground flax seeds for men may be beneficial but that flax seed oil should not be consumed? Thanks.

  • Cerraw

    I recently turned vegan.  I have lost 15 pounds in 4 months.  I feel so much better since I stopped consuming meat and dairy.  I have asthma and am a smoker but since not eating dairy I can breath much better.

  • InterestedParty

    I would really appreciate seeing more videos on gout.  There is a ton of conflicting information (or misinformation) about diet and gout: eat soy/don’t eat soy; avoid wheat bread/eat whole-grain bread; eat tomatoes/don’t eat tomatoes; eat lots of cherries, etc.  I’d love to get the real scoop on whether and how diet can prevent gout and whether diet can impact gout attacks when they occur.

    Many thanks for responding to my requests in the past!

  • dave johnston

    Dearest docta’ G!

    I and many others would love a LINK to McCarty’s vital report that concludes:

    “I suspect that the simple injunction, ‘Do not eat animal products’ has the potential to do more for world health than all of the abstruse wisdom in all of the world’s medical libraries.”

    So sorry if I missed it, as you source your facts almost as thouroughly as another favorite writer/healer/thinker truth-teller…Noam Chomsky [

    Please re-post or post a link to McCarty’s paper, if you would, or simply its title, so we might be able to hunt it down.

    Thank you Noblest of Physicians!
    I am 2 months into being primarilly vegen, and truly love it.
    THANKS for your wisdom, joyful guidance and subtle encouragement!

    Life! Dave in harrisburg, PA

    • MarthaLA

      If you look under the video ‘window’, you will see headings: Topics, Supplementary Info, Sources cited, etc. Click on Sources cited and the list will unfold (or drop down). McCarty is the last one, linked to an online source.
      Perhaps you’ve already found it, but I thought it might be helpful to note this for others who overlook those headings.

  • Mark


  • thatbrian

    Thanks, Dr Greger. You, Dr McDougall, and Dr Esselstyn are responsible for my going vegan. You converted me to a vegetarian first. That lasted a day. The very next day, I went vegan!

    It’s been five weeks, and I have never been hungry, never craved animal products, and I’ve lost 5 pounds! (without exercise).

    • Thea

      thatbrian: What a fun story! Thanks for taking the time to share it with us.

      Good for you.

  • Colliemom

    I agree with “The Tomato Effect” theory. Beyond that, many today lack time to research and prepare healthy vegan meals. People who don’t cook grab whatever is easy (or cheap) and those who do cook have not had enough experience preparing truly appetizing and satiating vegan meals. It is much faster for them to throw a roast in the crockpot with dry soup mix than to look up a recipe that requires a few spices and fresh ingredients they are not used to buying and do not have in their home.
    Finally, one has to be motivated to change. The “We’re all going to die from something” attitude is still strong for many.

  • Annette153

    I’d love to find a family physician who practices Lifestyle Medicine. Are there any resources for finding someone like this? I would love to find a dr. who “gets” why I eat a plant-based diet. Dr. Greger, I promise if you come to Akron, Ohio to set up practice, I will find you a ton of patients!!

    • arbus

      Hi Annette, I live in Akron too and have wished for the same thing too. My doc is ok but he has no interest or appreciation for my diet choices, even though I got off by blood pressure medicine by changing my diet,

  • Occams_Razor

    Dr. Greger, could we re-name this the Coconut Oil Effect? I couldn’t even argue with a friend who fed gobs of it to her 80-year-old husband, a brilliant music composer and choir director who had Alzheimer’s. “It’s good for you. The doctor told me it could help his Alzheimer’s.”
    I suppose she didn’t kill him, but she must still think she helped him, rather than hastening his death along.

  • tess

    is there any information on diet and dementia

    • Thea

      tess: I recommend taking a look at the book, “Power Foods For the Brain, An Effective 3-step plant to protect your mind and strengthen your memory” by Neal Barnard, MD. Dr. Barnard includes a lot of research in regards to diet and dementia.

  • Sam

    Is there anything that can done for tinnitus! I developed it after a heart attack! I take a lot of medications! Is there any particular med that contribute to this!

  • Majo

    OMG! YOU’R GOD!… haha excuse my enthusiasm, but you nailed how to express the roots of the problematics in today’s health and how still lots of people in health provision services still can’t look beyond they’re old teachings and look at evidence.

  • Mark

    Dr, do you have any information regarding excess calcium elimination in the urine hypercalciuria?