Doctor's Note

Here are some newer videos on the health benefits of blueberries:
How to Slow Brain Aging by Two Years
Boosting Natural Killer Cell Activity
Best Berries
Dietary Treatment of Glaucoma

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 other videos on brain health. Also, there are 1,686 other subjects covered in the rest of my videos--please feel free to explore them as well!

For some context, please check out my associated blog posts: Alzheimer's Disease: Up to half of cases potentially preventableNatural Alzheimer’s Treatment, and Raspberries Reverse Precancerous Lesions

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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 other videos on brain health. Also, there are 1,449 other subjects covered in the rest of my videos–please feel free to explore them as well!

  • JohnSwallow

    Dear Dr. Greger: I’ve been eating fresh/dried or frozen blueberries daily, often at least 2x a day, since learning they improve memory in older adults, thanks to your LCN Vol. 5. I’ve eaten blueberries regularly for most of a decade, since learning of the USDA/Tufts Univ. study of 40 fruits & veggies.
    What are optimal quantities? Since sleep is primarily for the brain to process events/thoughts of the day, would eating them again 2-3 hours before bed be wise, since they would be digested coincident with sleep?
    I’ve been taking Fish Oil 2-9 grams (now 2 x 2 times a day) and 1 tbsp. Flaxseed Oil for a decade (now 2 tbsp. Flaxseeds themselves at breakfast). Would these combine with blueberries to further optimize brain health??

    I’m a 54 yr. old male, 79 yr old mother clearly with undiagnosed Alzheimer’s or dementia, her mother with Alzheimers severely for 6 years, strongly for 10-12. I exercise regularly & vigorously and have NO signs of dementia.

    Thank you!!

    • Toxins

      Hello John Swallow,

      I cannot answer your entire question, as i’m sure Dr. Greger will get to it, but I need to reply to something troubling you wrote. And that is your use of fish oil. If you view this link, you will see fish oil is highly contaminated and quite harmful indeed
      I recommend you stop using fish oil as soon as possible, as even “filtered” fish oil has many of the same contaminants as regular. Not to mention that fish oil could result in “aggressive” prostate cancer.

    • Lea Walters

      Use Hemp Oil, it is high in both Omega 3 and Omega 6. Good substitute for fish.

  • Tan Truong

    I’ve got to eat some blueberries to study better. Hehe.

  • Michael Greger M.D.

    For some context, please check out my associated blog post Alzheimer’s Disease: Up to half of cases potentially preventable!

  • Cpgraetti

    Just saw this medical news about a nutritional drink that supposedly will help improve cognition in alzheimers.  What can you tell us about this study? 

  • Changeisgood

    What amount of Blueberries should be consumed per day for the memory benefits? And how long will that take to possibly see some positive result?
    Thanks muchly

  • LL

    Hello! I am a vegan medical student about to take the Step-1 medical licensing exam was wondering if you had any tips for brain-boosting snacks to help power-through 8-hours of intense-testing. If there’s anything to do/avoid the night before/at breakfast, I’d appreciate knowing that as well! Thank you for your time and consideration.

  • Roger Abramson

    Some people’s memory gets better with age no matter what they eat. “That fish he caught keeps getting bigger and bigger, every time he tells that story.”

  • Susan Peirce Thompson, Ph.D.

    Dr. Greger, are there any studies showing that eating well has an IMMEDIATE effect on cognitive performance? Take, for example, people who work in an office setting all day. Some of them eat a McDonald’s breakfast sandwich on the way in, candy out of the secretary’s dish mid-morning, two pieces of pepperoni pizza for lunch, and tons of coffee with cream and sugar all day long. Other folks eat oatmeal with flax seeds and blueberries in the morning, and a big bowl of broccoli, tofu, and brown rice for lunch. By the 4 p.m. strategy meeting won’t the people in the second camp be thinking more clearly? Are there studies on this kind of immediate effect of diet quality on cognitive performance? Thanks.

  • Dave

    Dr Greger, I have been having very little success at getting a Healthy whole foods plat diet for my mother in her assisted living facility. Do you have hay suggestions, or resources that might help? Thank you.

  • Carol

    Dr. Greger, Thanks for having this forum! Would you address which amino acids are particularly important for memory? I can only seem to go about a month on a vegan diet before developing problems, which wasn’t true until recently. Spirulina, raw veggies, and balancing seeds and grains with every meal extends the time to about a month. But something seems to be missing!

    • Joseph Gonzales R.D.

      Hi Carol. Thanks for your questions. All essential amino acids are important. Trying to recall my biochemistry, phenylalanine and tryptophan come to mind, play important role in neurotransmitter synthesis. Think of dopamine (regulates mood) and Norepinephrine (keeps mind active, alert), serotonin (helps with sleep), etc. I try to stay away from counseling folks to focus on particular amino acids. It it perfectly fine to know what foods are higher than others, but all protein sources have some. If you are eating a mix of foods with protein, all amino acids good for memory should be covered. The idea is variety and finding the best protein sources available. Beans, lentils, peanuts, other nuts and seeds are very high in phenyalanine and tryptophan. I would cautious about spirulina as a protein source and healthy food. I hope this helps a bit!


  • Carol

    Do supplements such as phosphatidylserine, ginko biloba, vinpocetine and huperzine A really help with brain function and dementia?

  • Alan A

    Dear Dr. Greger. I would love for you to do a HHH video on Transcranial Direct Current Stimulation (tDCS). Its growing popularity has lead me to wonder if it is effective it is at improving memory, learning and brain activity over all. I’m amazed by the DARPA report on this yet I wonder if it is creditable or is it perhaps propaganda designed to mislead foreign militaries. There is a massive DIY community growing and now larger ventures are being created targeting the gamer community. Getting to the truth would be great. I even have the video title for you. “Could consuming elections directly be a healthy part of a vegen diet?”