『Is Your Brain Getting Fed? The Micronutrients Most of Us Are Missing』のカバーアート

Is Your Brain Getting Fed? The Micronutrients Most of Us Are Missing

Is Your Brain Getting Fed? The Micronutrients Most of Us Are Missing

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 Chris Miller MD and I went deep on this one. We sat down for a Friday live and covered something that gets overlooked in the constant noise about macronutrients, protein targets, and which diet trend deserves your attention this week. We talked about the micronutrients that actually keep your brain and body running, the ones most people never test for, and what happens when they quietly fall short.If you watched the replay, this is your reference guide. If you haven’t watched yet, start with the video above and come back here for the details.Your Brain Has a BouncerBefore we got into specific nutrients, Dr. Miller explained something worth understanding: the blood-brain barrier. Your brain is picky about what it lets in. Unlike your gut lining, which is one cell layer thick and held together by tight junctions, the blood-brain barrier is roughly 400 times tighter. It has to be. Your bloodstream carries immune cells, toxins, and pathogens that would cause serious damage if they reached your brain tissue.Specialized cells called astrocytes, pericytes, and microglia wrap themselves around the blood vessels that supply the brain, creating a filtration system that only allows through what the brain actually needs: glucose via dedicated transporters, oxygen, carbon dioxide, and select nutrients. Everything else gets turned away.When this barrier is working well, the brain stays protected while the glial cells on the inside handle cleanup and maintenance. That is a healthy brain. And the nutrients that make it through that barrier are exactly the ones we spent the rest of the session talking about.Vitamin DDr. Miller started here because it is one of the most common deficiencies she sees, regardless of diet. You may not feel it right away, but signs can include slower wound healing, getting sick more often, autoimmune flares, and declining bone density.The test to ask for is a 25-hydroxy vitamin D level. I aim to get my patients into the 40 to 60 range. Below 20 is clearly deficient, and most physicians will agree with that. Research during the pandemic showed that individuals with levels closer to 46 to 50 had less severe infections, which tracks with what we know about vitamin D’s role in immune and cardiovascular protection. It functions more like a hormone than a simple vitamin, and your whole body depends on it.Here is the thing that surprised me about my own levels. I have lived in sunny places for most of my life. I run outside regularly without sun protection (yes, I know). And I have never been able to get my vitamin D above 30 without supplementation. There are genetic variations that affect your ability to convert sunlight into usable vitamin D, which is why testing matters more than assumptions.Most of my patients do well on around 2,000 IU daily, but this is individual. I would not take over 4,000 IU without a physician monitoring your levels, because toxicity is real. NatureMade is a reliable, affordable brand you can find at any pharmacy or Walmart.MagnesiumThis one comes up constantly. Even people eating a solid plant-based diet can fall short. The challenge with magnesium is that blood tests are unreliable. Only about 1% of your total magnesium circulates in your blood, so a serum level can look normal while your tissues are depleted. An RBC (red blood cell) magnesium test is somewhat better, but still imperfect.Pay attention to symptoms: muscle cramps, especially if you are on a diuretic like hydrochlorothiazide. Difficulty sleeping. Muscle twitching. Anxiety. Heart palpitations. Migraines. Headaches. Constipation. As we get older, the cramping and sleep disruption tend to be the most common complaints.For food sources, pumpkin seeds are a powerhouse. I eat them every single day. Dark chocolate (you are welcome), avocado, almonds, and leafy greens are all solid sources. But if you have gut issues, if you are gassy or bloated or dealing with loose stools or constipation, there is a good chance you are not absorbing well. Aging also reduces stomach acid, which compounds the problem.Someone asked during the live what the best form of supplemental magnesium is for muscle twitching. Dr. Miller and I both recommend magnesium glycinate (or bisglycinate), 200 to 400 milligrams. It absorbs well and is less likely to cause the GI side effects you might get from other forms.Omega-3 Fatty AcidsDr. Miller brought this one up because of her focus on inflammation and healthy aging. What your body really needs are EPA and DHA, the two omega-3 fatty acids that do the heavy lifting for joint health, cardiovascular protection, and brain function. DHA in particular is critical for the brain, and people who carry the APOE4 gene may need even more of it to get adequate amounts across the blood-brain barrier.If you eat fatty fish like salmon, mackerel, anchovies, sardines, or herring, you are getting pre-made EPA and DHA. If you eat plant-based, you can get ALA from flax seeds, chia seeds, walnuts, hemp seeds,...
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