by Dr. David Perlmutter
Five
years ago today, we embarked on an incredible journey. Together, we sought to
understand the roots of brain health, and how we can help fend off ailments like
dementia and Alzheimer’s, diseases for which there is no known cure. This
journey began with the release of Grain Brain.
In the
five years since, science has continued to investigate the role carbs and
gluten play in our health, and our message has moved to the mainstream. As a result,
the information is Grain Brain is now accompanied by ongoing changes and
revelations in the world of medicine. Today, I want to share with you the five
most interesting things I’ve learned/seen since Grain Brain hit shelves.
1. The Western scientific community
has aggressively shifted its position regarding the validity of the idea that
sugar poses the greatest nutritional threat to our health, and that dietary fat
is not the villain it had been previously portrayed to be. How exciting it is
that even the 2015-2020 Dietary Guidelines for Americans
call for a dramatic restriction of sugars (finally!), while indicating that
fats should now be considered an important part of a healthful diet.
Clearly, there was more than a bit of backlash when I made these statements in Grain
Brain. But there’s still work to be done. Case in point: the American Heart Association
continues to sanction the idea that women can add six teaspoons of sugar to
their diets each day, while men can get away with nine!
2. Grain Brain came out swinging
against the consumption of gluten. The response was supportive, but there was
pushback. The biggest pushback came from those who wanted to hold on to the
idea that the only people who needed to restrict gluten were those who were
diagnosed with celiac disease. How powerfully validating it has been to see the
science that clearly defines the notion of non-celiac gluten sensitivity,
meaning that people can experience a variety of symptoms, many of which are not
gut-related, who do not carry a diagnosis of celiac disease! This was
eloquently described in the Journal of the American Medical Association.
Moreover, newer research has shown that
permeability of the gut lining, a central mechanism in creating inflammation in
the entire body, occurs in all humans with gluten consumption. So it
looks like we didn’t stretch the point.
3. Yes, your brain can grow
new neurons. As we
originally described in Grain Brain, the human brain has the incredible
ability to grow new brain cells. Our original discussion focused on the pivotal
role of exercise in enhancing this process, known as neurogenesis. Newer
research not only continues to confirm the role of exercise in promoting neurogenesis,
but also demonstrates how being on a ketogenic diet enhances this process.
Since Grain Brain was published, we have been all over this exciting
science that shows how cutting carbs, eating more healthful fats, and
supplementing with things like MCT oil enhance the body’s production of
ketones, which change the expression of our DNA (for the better) and provide a
superfuel for the brain. (If you want to learn more about ketosis, sign-up to
get my free guide to ketosis and the ketogenic diet)
4. Our gut bacteria control
our health destiny. This simple fact has virtually exploded on the
health and science scenes. While this was not described in Grain Brain, it
was the central thesis of our follow-up book, Brain Maker. Who knew that each
and every one of our day-to-day lifestyle choices, including our food choices,
exercise habits, sleep routines, stress levels, supplement regimen, etc., not
only exerted direct effects on our health, but other effects that may be even
more pronounced, through changes that occur in our gut bacteria.
5. We can change the
expression of our DNA. This exciting topic has certainly challenged one
of the fundamental tenets of biology for any of us who were in medical school prior
to the 1990s! Then, it was a widely held belief that our DNA was an inviolate
code that dictated everything about our health and wellbeing. What a conceptual
revolution! We now fully recognize that, moment-to-moment, our various
lifestyle choices directly influence our gene expression. We literally have the
ability to turn on genes that favor health while suppressing those that code
for risk for disease, just by the choices we make! While this was an important
discussion in Grain Brain, this science, known as epigenetics, has
expanded dramatically. We now understand, for example, that even our gut
bacteria play a role in modulating the expression of our DNA. The research
showing how dietary choices affect gene expression has certainly expanded,
especially in the area of the ketogenic diet. This is powerful and empowering
information that each of us can leverage to rewrite our health destiny!
