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Flashback Friday: Four Nuts Once a Month

“Four Nuts Once a Month” This is one of the craziest
articles I saw all year. A single consumption of high
amounts of brazil nuts improves the cholesterol levels
of healthy volunteers. OK, that’s interesting. They gave 10 men and women a single
meal containing 0, 1, 4, or 8 brazil nuts, and found that the ingestion of
just that single serving almost immediately improved
cholesterol levels. LDL, so-called “bad” cholesterol levels in
the blood were significantly lower starting just 9 hours after
the ingestion of nuts, and by no insignificant amount,
nearly 20 points within a day. Even drugs don’t
work that fast! It takes statins like 4 days
to have a significant effect. But that’s not even
the crazy part. They went back and measured
their cholesterol 5 days later, and then 30 days later. Now keep in mind they weren’t
eating brazil nuts this whole time. They had just that single
serving a month before and their cholesterol was
still down 30 days later! It went down and stayed down,
after eating just four nuts… That’s nuts! And no, the study was not funded
by the brazil nut industry. Interestingly, 4 nuts actually seemed
to work faster than the 8 nuts to lower bad cholesterol
and boost good cholesterol. These results suggest
that eating just 4 nuts might be enough to improve
the levels of LDL and HDL for up to 30 days,
and maybe longer— they didn’t even
test past 30. Now normally, when a study comes
out in the medical literature showing some too-good-to-be-true
result like this you want to wait to see the results
replicated before you change
your clinical practice, before you recommend something
to your patients, particularly when the study is
done on only 10 people, and especially when the findings are literally
just too incredible to be believed. But when the intervention is cheap,
easy, harmless, and healthy— eating 4 brazil nuts a month— then in my opinion, the burden
of proof is kind of reversed. I think the reasonable default position
is to do it until proven otherwise. So now every month I
eat 4 brazil nuts. In conclusion, a single
serving is sufficient without producing liver
or kidney toxicity. I should hope not! But what they’re referring to is the
high selenium content of brazil nuts, so high that 4 eaten every day
might actually bump up against the tolerable daily
limit for selenium. But not something we have to worry about
it we’re just eating 4 once a month.

Randall Smitham



  1. John Keane Posted on August 23, 2019 at 12:05 pm

    So eat just 4 a month or 4 a day ?

  2. CosmicDamian Posted on August 23, 2019 at 12:05 pm

    Has somebody repeated these findings yet? The study strains credibility.

  3. Brent Cook Posted on August 23, 2019 at 12:07 pm

    I’ve been putting two in my smoothies everyday.

  4. Daniel Alin Dan Posted on August 23, 2019 at 12:08 pm

    Yeah, I know we're supposed to be low sodium but I'm gonna take this with a pile of salt.

  5. Pickle Beaker! Posted on August 23, 2019 at 12:09 pm

    Brazil nuts r radioactive, eat too many and u'l glow in the dark!

  6. Natasha Nakonechnaya Posted on August 23, 2019 at 12:11 pm

    its about Brazil nuts not about all nuts …. Right????

  7. Ryan Finchum Posted on August 23, 2019 at 12:12 pm

    What about 1 a week?

  8. Natural Hulkster Posted on August 23, 2019 at 12:12 pm

    I ate 4 Brazil nuts and turned green and I have a terrible temper now.

  9. Dennis Nowland Posted on August 23, 2019 at 12:18 pm

    There are lies, damn lies, and statistics or should we say nutritional research.

  10. Stanley Slabodnick Posted on August 23, 2019 at 12:18 pm

    I believe it is actually selenium working magic. Look into other foods and supplements with selenium and they will help in the same way. Statin medication is dangerous and never actually seen good results without negative results.

  11. movement2contact Posted on August 23, 2019 at 12:19 pm

    I get headaches after overdosing on Brasil nuts >_<

  12. Tomdeblink Posted on August 23, 2019 at 12:30 pm

    Mickey Mouse to Sony. I want half! Sony laughs in Jameson

  13. Youtube Oncologist Posted on August 23, 2019 at 12:30 pm

    Hey Dr greger, are there any kinda of foods or diets that work for hair health and hair loss in both men and women? Thanks!

  14. shean7890 Posted on August 23, 2019 at 12:34 pm

    I'll eat 1 brz.nut each week instead

  15. sooooooooDark Posted on August 23, 2019 at 12:43 pm

    sounds like a fast for some girls
    ^go figure out all possible interpretations of that sentence

  16. Luke Weaver Posted on August 23, 2019 at 12:45 pm

    I eat way too many Brazil nuts, up to a couple dozen/day, & eat them daily when available, which is about half the time. Brazil nut butter is delicious too! Also, I supplement w/selenium 200-400mcg/day. I have experienced no listed side effects of too much selenium. I believe since it kills cancer and supports mental health, it has been put on the list of "bad" healthy things, like B17/bitter apricot seeds, etc.
    Competition for the drug$!

  17. Indra Posted on August 23, 2019 at 12:50 pm

    @drpetrabracht, a German Doctor, recommends 2-3 per day for her Hashimoto patients. The LDL effect is something very new to me. I think we should only take organic nuts. Thanks for these information. I like your book how not to die 🌱🤗

  18. Noah Nobody Posted on August 23, 2019 at 12:52 pm

    I found a nice thing for helping blood pressure that worked well on me.

    2-3 large cloves of crushed garlic.
    1 teaspoon of honey.
    1 teaspoon of balsamic or apple cider vinegar (I haven't tried apple cider vinegar though).
    1 teaspoon lemon juice.
    1 teaspoon crushed ginger.
    Mix well.

    Put in a jar in the fridge for about 3 days.
    Take 1-2 teaspoons (5ml-10ml) with 300ml of water in the morning, about 20 minutes before breakfast.
    Note, if you are on blood pressure meds, check your blood pressure doesn't get to low.

  19. urthebest1122 Posted on August 23, 2019 at 12:54 pm

    Brazil nuts are worth their weight in gold. I buy a bag of organic nuts (keep them in the fridge) and eat two a few times a week to get selenium naturally and to keep cholesterol in check. Don’t eat more than a couple a day. Brazil nuts are very high in selenium.

  20. Vladimir Yuvachov Posted on August 23, 2019 at 12:55 pm

    Four nuts a month seems a lil on the low side ( ͡° ͜ʖ ͡°)

  21. mr blob Posted on August 23, 2019 at 1:32 pm

    The reason why this works is lots of people are deficient in selenium. Having adequate selenium will reduce cholesterol. That’s why the effect lasts

  22. Sarah VeganGarden Posted on August 23, 2019 at 1:39 pm

    I just bought your book, Dr Greger, and showed it to my friend and now she's also bought the book and the audible version. Also showing it to my family. Many thanks!!

  23. Eva N Posted on August 23, 2019 at 2:03 pm

    Does that mean I can eat animal products and keep cholesterol low with eating nuts? That’s nuts

  24. sunny pepper Posted on August 23, 2019 at 2:05 pm

    How hard to test this again? Seems like it would be an easy thing for students to see if they can reproduce the results. Someone please put it to the test – and publish!

  25. Emily BH Posted on August 23, 2019 at 2:07 pm

    These studies never mention other factors that might be involved like what ELSE were the people in the study eating or not eating during that time frame which could have had a HUGE impact on the results? I'm not discounting the fact that Brazil nuts don't have redeeming qualities, I'm just suggesting that for results to be THAT dramatic, other factors probably came into play.

  26. Suuga Berry Posted on August 23, 2019 at 2:18 pm

    Oops not 3 a day I take it. They're so delicious though.

  27. Jeong-hun Sin Posted on August 23, 2019 at 2:37 pm

    Study funded by Brazil.

  28. Lefty McManus Posted on August 23, 2019 at 2:39 pm

    So, was this ever replicated? And was it ever tested on unhealthy volunteers?

  29. Trace Absence Posted on August 23, 2019 at 2:40 pm

    I’ve been eating half a brazil nut a day. My high cholesterol, long gone.

  30. Dinar AndFriends Posted on August 23, 2019 at 2:46 pm

    The drop in LDL-C was probably caused by the selenium. It doesn't follow that other nuts will have the same effect.

  31. Paper Tiger Posted on August 23, 2019 at 2:48 pm

    This has to be the most useless video ever made by this channel! Must be running out of useful information so this is what you present?

  32. BargainBasement Lunatic Posted on August 23, 2019 at 3:29 pm

    Not good for us nut allergy folks

  33. Justin Goodson Posted on August 23, 2019 at 3:31 pm

    So is 4 nuts once a month better than like 1 a day?

  34. Sidilicious Posted on August 23, 2019 at 3:47 pm

    I wish these nut studies would specify whether the nuts were raw or roasted, and what difference it makes whether they are or not.

  35. 0ThrowawayAccount0 Posted on August 23, 2019 at 4:09 pm

    My wife and I have been on the “4 nuts a month” lifestyle before it was cool.

  36. StefaniaKassiopaia Posted on August 23, 2019 at 4:13 pm

    Selenium Conten varies widely though. Brazil nuts are even grown in china. I believe only those from Bolivia have high amounts of selenium (in general) ….. but even then, selenium content most probably also varies from nut to nut

  37. Beatnik Bandit Racing Posted on August 23, 2019 at 4:25 pm

    I like clams

  38. Jan Posted on August 23, 2019 at 4:31 pm

    I've actually been eating them as part of trail mix haha 😄

  39. ts Posted on August 23, 2019 at 4:53 pm

    I wonder about the very high methionine content of Brazil nuts, though, which should result in elevated TMAO levels and higher homocysteine in the blood. Since this is an independent risk factor for cardiovascular disease, it may attenuate the benefits of lower LDL.

  40. Just Checking Posted on August 23, 2019 at 5:13 pm

    I have One Brazil Nut a day for selenium too protect from cancer however overdosing on Selenium can cause cancer. My cholesterol is A ok.

  41. Doug bananaboy Posted on August 23, 2019 at 5:25 pm

    Is this industry funded science who bought this study ?

  42. Mrs. Roper Posted on August 23, 2019 at 6:34 pm

    okay, I will schedule it on my calender to have a brazil nut every monday, on an empty stomach.

  43. تحفة كونية Posted on August 23, 2019 at 6:37 pm

    Wow 😮 that’s unbelievable just four !! How !?? 😭😭😹

  44. Bd Adams Posted on August 23, 2019 at 6:38 pm

    I've been eating one nut every Sunday for several years now. I consider it my Sunday treat because is so delicious. Not sure if one a week is as healthful as 4 once a month!

  45. tamcon72 Posted on August 23, 2019 at 6:50 pm

    This IS nuts, ha-ha! I was wondering about the selenium toxicity, per a previous video topic from NF, so thanks for addressing this!

  46. Eric Fajeta Posted on August 23, 2019 at 7:42 pm

    I ate two today. yay.

  47. Swiss Lady Driver Posted on August 23, 2019 at 9:48 pm

    If the volunteers were already healthy at the start of the study, then doesn't that mean that their serum lipid levels were already ideal at baseline? And would this work at all on people with hyperlipidemia?

  48. vibramar-te Posted on August 23, 2019 at 10:14 pm

    Thanks for Italian translation💛

  49. HT logistics3434 Posted on August 23, 2019 at 10:39 pm

    The people who dislike this are NUTS😭😭🤣🤣

  50. Plantbased Outdoors Posted on August 23, 2019 at 11:12 pm

    I don't know about you other guys, but I'm definitely getting more than four nuts a month. Have you seen how hot my girlfriend is?

  51. Bruno Paquette Posted on August 24, 2019 at 4:51 am

    I guess the next Flashback Friday should be on eating 4 head of broccoli a month. This is funny.. Money spent about studying people eating 4 nuts a month.. 4 nuts a month….. How, why? Next study money should be spent on how people do on 3 nuts a day and 5 nuts a day.. Let's see.. We might see a difference.

  52. xxx xxx Posted on August 24, 2019 at 9:01 am

    Watching this while Amazon is on fire in Brazil. 😭

  53. Mimijona Posted on August 24, 2019 at 10:10 am

    What about the recommendation of eating 1-2 brazil nuts every day to keep up the selenium in each day?

  54. Kristoffer Kavallin Posted on August 24, 2019 at 11:30 am

    Sorry to ask in a video not really related..
    I have found myself eating more and more dandelion leafs. They are readily available when I'm out working on the fields.
    Have aquired a taste for their bitterness and can eat 100+ leafs a day.
    Ofcouse, leafy greens are healthy, but how can I know what leafs are good for me, and which I should eat fewer of?
    Gorillas seem to know this by heart, and I imagine that prehistorical humans also just knew, watching adults eat certain plants from young age… But me as a modern person is really cluelsss.. 🙁

  55. Eros Ramasotti Posted on August 24, 2019 at 1:03 pm

    With all due respect, I gotta say, as a scientist, what you say regarding the burden of proof, really made me cringe

  56. Eric Pecina Posted on August 24, 2019 at 1:32 pm

    That's nuts!

  57. Mike H. Posted on August 24, 2019 at 10:29 pm

    Is there a bad joke this..somewhere? my0my.

  58. Alyssa Stevens Posted on August 25, 2019 at 12:51 am

    Just bought them today XD thankfully a store near me sells them by the pound.

  59. Katrina Hamilton Posted on August 25, 2019 at 4:03 am

    I wonder what one a day does. I eat one to two Brazil nuts to support my thyroid every day.

  60. Hi Technique Posted on August 25, 2019 at 4:11 am

    shoutout to the lawnmower in the background at the end of the video

  61. Karolyn Herrera Posted on August 25, 2019 at 7:03 am

    ***raw or roasted??***

  62. DrD4n Posted on August 25, 2019 at 7:06 pm

    Holy smokes. I am having like 4-5 on my daily smoothie bowl for the last weeks. Seems like I should overthink that and only do it once a month…

  63. William McClellan Posted on August 26, 2019 at 4:06 am

    Raw or dry roasted or either way?

  64. Andrew Zak Posted on August 26, 2019 at 10:51 am

    I would belief more in this study if it was ever replicated, in country let say, like 🇸🇪Sweden🇸🇪 that does not export 🌰🌰🌰nuts.

    what about the confounding 🙊factors here… laughable 🦄results

  65. no name Posted on August 26, 2019 at 3:26 pm

    What is the actual ingredients in the Brazil nut that lowers cholesterol? Is it Selenium Or is it something else? So, then is 2 a day OK or is that too much selenium?? What other foods contain selenium?
    20 Foods Rich in Selenium
    Brazil nuts
    Enriched foods
    Cottage cheese
    Brown rice
    Sunflower seeds
    Baked beans
    Milk and yogurt

  66. Daniel Lugo Posted on August 27, 2019 at 1:41 pm

    Finally someone explains us nutrition the right way

  67. John Burns Posted on August 28, 2019 at 6:21 am

    More Nonsense and fake-science. What rubbish! https://www.youtube.com/watch?v=ZIF0ZB6g6tg Dr Greger has done much early work that was invaluable and important. But, he has lost his way. He is now just agenda driven, without much regard for the truth. Very sad. He is playing into the hands of the meat, dairy, SOS, and junk-food companies. He is making near-daily ridiculous statements that are less actual science-based, and more wishful-thinking. And they will take his own false statements, and turn them against the Vegan Community. Dr Greger needs to stop the exaggerations and hyperbole now!

  68. Anupam Khemariya Posted on August 28, 2019 at 7:56 am

    Jeff Nelson is teaching Dr.gregar and Dr.Fuhrman nicely.👌👌👌☺👍

  69. Patrick McGowan Posted on August 28, 2019 at 9:53 pm

    I ate 5 brazil nuts and all my pubic hair fell out.

  70. The Artificial Society Posted on August 29, 2019 at 11:43 am

    If something sounds too nuts to be true, then it probably isn’t. If you grab your keys and start driving to the health food store because of this video, your nuts. Brazil nuts are loaded with bad fat. Besides the bad fats in Brazil nuts, you can easily get toxic levels of selenium from them. We all want Brazil to stop burning the rainforest, but eating Brazil nuts is not going to do it.