DHA and Our Brains
By Zach Nasr
Food And Supplements For Optimal Brain Function
The Importance of Omega-3’s:
DHA is one of the most important omega-3 fatty acids in our diet. First off, what is an omega-3 fatty acid? There are two essential fatty acids (EFA’s) which are alpha linoleic acid (an omega-3 fatty acid), and linoleic acid (an omega-6 fatty acid).
They are called “essential” because our bodies cannot produce them so we must acquire them from food sources. When it comes to omega-3’s, there are three main players:
ALA (alpha linoleic acid)
EPA (eicosapentaenoic acid)
DHA (docosahexaenoic acid)
ALA must be acquired from food sources because we can’t create it. The other two Omega-3’s are often also considered to be essential by many experts, but they are “conditionally essential” because ALA can be converted into EPA and DHA.
The problem is that our bodies’ ability to convert ALA into EPA is typically only about 10% (depending on what study you look at), and our ability to convert EPA into DHA is only about 1% of that initial 10%!
Love Your Liver
Additionally, this conversion occurs in the liver, and only works if your liver is functioning optimally.
Since we live in a world that we humans have filled with pollution, most people’s livers are dealing with a total crisis of contamination, so this conversion is likely even less!
DHA and Your Brain
As you will read, these fatty acids are very important for brain health, but because we technically can convert ALA into DHA and EPA, there is no officially set recommended daily intake.
In this article, we will talk about what these fatty acids do, how much to take, and some easy ways that we can supply these nutrients.
Why is DHA so special?
DHA is the rarest needed fat that we find in foods, and it is the final stage of the conversion process that Omega-3’s undergo in our bodies. If we can get an optimal amount from diet and/or supplementation, then it takes the pressure off our liver to convert other omega-3’s into DHA.
Much of the research on Omega-3’s show DHA specifically to have the most beneficial effects on memory, and brain health. In the Chicago study (1), a strong neuroprotective effect was observed with DHA that was not seen to the same degree with EPA.
Several studies have also shown that people with Alzheimer’s have severely low levels of DHA in key areas of the brain related to memory formation like the hippocampus (2)(3).
In another study at Rotterdam (4), it was discovered that eating even one meal per week that included fatty fish like salmon could reduce the incidence of cognitive decline and dementia by up to 60%!
DHA also helps improve cognitive abilities in aging rats who do not have a neurodegenerative disease (5). Other studies show DHA improving cognitive abilities, and learning in healthy young rats as well (6) which means that you do not have to be sick to get better from using DHA!
Many of these health benefits come from the antioxidant, and anti-inflammatory effects of DHA shown in the image below. However, many of the brain benefits, as you will soon see, come from the fact that it is a crucial structural component of the brain itself.
The next crucial piece of this omega-3 puzzle lies in fetal brain development and the first few years of our lives which are some of the most formative years for our brains and neurons.
I have often stated the importance of healthy fats because our brains are about 60% fat. I also like to remind everyone that our brains consume about 25% of our total energy and nutrition even though our brains make up only a small part of our body mass.
When we are in the womb, this energy consumption goes up to 70%! Almost all of our energy resources go to building our brain and nervous system when we are a fetus, and DHA is a crucial part of this building process.
Our Brain and Our Eyes
DHA makes up about 30% of our brain matter and approximately 50% of the retinal structure in our eyes. Adding DHA to your diet not only increases cognitive function, but it also increased visual acuity in developing humans and animals (7).
As if this were not enough of a reason to make sure you are getting enough DHA in your diet, another study found that babies born with neurological problems had low levels of DHA, and other important fatty acids, and had elevated levels of trans fats in their brains (8).
Avoid Trans Fats and Get DHA
Humans are basically just grown up babies which is why we recommend avoiding trans fats and other inflammatory fats, and adding in anti-inflammatory fats like DHA and EPA into your diet. DHA reduces inflammation by reducing the expression of Nf-kB (Nuclear factor kappa-beta) among many other anti-inflammatory actions shown in the image below.
Nf-kB is an inflammatory marker in our bodies that we can measure that can generally show us how much inflammation or oxidative stress is occurring in out bodies.
How Big of a Problem is This?
What’s pretty scary is that we in the United States have an imbalance of fats in our diets that is reaching epidemiological proportions. It is recommended that we eat a 1:1 ratio or at most a 1:2 ratio of omega-3 fatty acid to Omega-6 fatty acid.
However, the average American eats between 1:16 and 1:36 ratio of Omega-3 to Omega-6. Many of us are eating too many fried foods that are cooked in rancid (oxidized) Omega-6 oils like vegetable oil, canola oil, cottonseed oil, soybean oil, and other common polyunsaturated fatty acids (PUFA’s).
In order for our bodies to properly metabolize these fats, we need a balance of them in pretty even ratios.
Some oils like olive oil are naturally in a healthy balance of Omega-3 to Omega-6, while oils like vegetable oil (which are not actually made from vegetables, but from the seeds of grasses) are almost entirely Omega-6 fatty acids.
Ventresca Tuna Bellies from Vital Choice: 3550 mg total omega-3’s per 1/2 can:
EPA 840 mg • DHA 2430 mg
How Much is Enough?
The American Heart Association says that we should eat two or more servings (3.5 oz.) of fatty fish like salmon, sardines, tuna, etc. in order to support cardiovascular health, but a dietary survey of shows that most Americans eat half that amount or less.
According to one dietary study (9), most Americans get a dose of combined EPA and DHA equalling 100-200mg per day while many experts recommend getting at least 650mg (combined EPA/DHA) per day, and I like my intake to be at least 500mg of DHA a day. More is even more beneficial as “Supplemental intakes of EPA and DHA combined at doses up to 5 g/day… do not raise safety concerns for adults.” CITE
What About Vegan Sources?
ALA can be found in many vegetarian and vegan sources like flax, hemp, and chia seeds while EPA and DHA (the important conditionally essential fatty acids) are primarily found in animal foods like fatty fish and eggs.
If you are a vegan, then I highly recommend supplementing EPA and DHA. Luckily, there is one vegan source of EPA and DHA that is cold-pressed from algae. You can find our favorite vegan omega-3 supplement (including EPA and DHA) by clicking on the image below.
DHA and Our Brains - Learn how to Feed a Brain! https://feedabrain.com/dha/