Selenium's Role in Brain Health

The Role of Selenium in Neurological Health

In this episode of The Dr. Ardis Show, Dr. Brian Ardis presents a comprehensive review of medical literature suggesting that a single mineral—Selenium—is critical in preventing and reversing symptoms of Alzheimer’s, Parkinson’s, and Multiple Sclerosis (MS). Dr. Ardis argues that Selenium deficiency is a primary driver of cognitive decline and that supplementation can mimic the neuroprotective benefits of exercise.

The Mechanism: Oxidative Stress and Neurogenesis

Dr. Ardis explains that the brain is highly susceptible to oxidative stress, a key factor in neurodegenerative diseases. Selenium is required to synthesize selenoproteins and glutathione peroxidase, which act as the body’s primary defense against oxidative damage and inflammation.

Furthermore, research cited in the episode highlights that Selenium stimulates neurogenesis (the growth of new neurons) in the hippocampus, the area of the brain responsible for memory and learning.

Key Research Findings

• ** The Exercise Connection:** Studies on mice revealed that physical exercise improves brain function by increasing the transport of Selenium to the brain. Crucially, researchers found that administering Selenium without exercise resulted in the same increase in neural precursor cells—effectively doubling or tripling the number of new neurons. This suggests Selenium is a viable therapy for elderly or disabled individuals unable to exercise.

• Alzheimer’s Disease: A systematic review of human studies showed that Alzheimer’s patients consistently exhibit lower Selenium levels in their plasma and red blood cells compared to healthy controls. Supplementation significantly increased Selenium levels in the Cerebral Spinal Fluid (CSF) and improved cognitive test scores (such as the MMSE and ADAS-Cog), often outperforming multivitamins that contained lower doses.

• Parkinson’s Disease: The transcript details how Selenium protects the nigrostriatal pathway, a dopamine pathway essential for motor control.



Image provided by Gemini AI

Degeneration in this pathway leads to Parkinson's symptoms like tremors and rigidity. Studies indicated that Selenium deficiency exacerbates damage to dopamine neurons, while supplementation reduced DNA damage and improved motor function.

Thyroid and General Health

Dr. Ardis reiterated a foundational point regarding thyroid health: the thyroid cannot synthesize hormones (T3 and T4) without three specific components—Selenium, Iodine, and the amino acid Tyrosine. He suggests that many thyroid conditions are actually untreated Selenium deficiencies.

Dosage and Recommendations

The episode concludes with practical advice on dosage. While the FDA recommends a daily limit of roughly 200–400 mcg, Dr. Ardis discusses the safety of higher doses for therapeutic purposes, citing experts who suggest up to 1.2 mg may be safe. However, the standard recommendation provided is 200 mcg per capsule, suggesting 2 capsules (400 mcg) daily for those with neurological concerns to restore cognitive function and protect against oxidative stress.

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Annotated Bibliography: Selenium and Neuroprotection

Akbaraly, T. N., Hininger-Favier, I., Carrière, I., Arnaud, J., Gourlet, V., Roussel, A. M., & Berr, C. (2007). Plasma selenium over time and cognitive decline in the elderly. Epidemiology, 18(1), 52–58.

Transcript Context: Referred to as the "EVA Study" (Epidemiology of Vascular Aging), this 9-year longitudinal study followed 1,389 elderly participants in France. Key Findings: The study established a longitudinal link between falling selenium levels and cognitive decline. Researchers found that participants with the greatest decrease in plasma selenium over the 9-year period had the highest probability of cognitive decline. Conversely, those who maintained or increased their selenium levels showed a protective effect against cognitive deterioration.

Cardoso, B. R., Ong, T. P., Jacob-Filho, W., Jaluul, O., Freitas, M. I., & Cozzolino, S. M. (2010). Nutritional status of selenium in Alzheimer's disease patients. British Journal of Nutrition, 103(6), 803–806.

Transcript Context: Dr. Ardis discusses this study to highlight the deficiency of selenium in diagnosed patients. Key Findings: This case-control study compared 28 elderly patients with Alzheimer’s Disease (AD) to 29 healthy controls. It found that selenium concentrations in plasma, erythrocytes (red blood cells), and nails were significantly lower in the Alzheimer’s group. The authors concluded that selenium deficiency is strongly associated with the pathology of AD, potentially due to the brain’s inability to combat oxidative stress without adequate selenoproteins.

Leiter, O., Zhuo, Z., Rust, R., Wasielewski, J. M., Grönnert, L., Kowal, S., ... & Walker, T. L. (2022). Selenium mediates exercise-induced adult neurogenesis and reverses learning deficits induced by injury and aging. Cell Metabolism, 34(3), 408–423.

Transcript Context: This is the foundational mouse model study cited regarding "exercise vs. supplementation." Dr. Ardis refers to the lead researcher, Dr. Tara Walker. Key Findings: The study discovered that the cognitive benefits of physical exercise are mediated by the transport of selenium to the brain via the protein selenoprotein P. Crucially, the researchers demonstrated that selenium supplementation alone (without exercise) could replicate these effects, tripling the number of neural precursor cells in the hippocampus and reversing cognitive deficits caused by aging and hippocampal injury.

Pereira, M. E., Souza, J. V., Galvao, J., & Oliveira, C. S. (2022). Effects of selenium supplementation in patients with mild cognitive impairment or Alzheimer’s disease: A systematic review and meta-analysis. Nutrients, 14(15), 3205.

Transcript Context: Dr. Ardis uses this systematic review to argue for the efficacy of selenium supplementation in humans. Key Findings: A meta-analysis of 11 clinical studies involving selenium supplementation. The review found that supplementation significantly raised selenium levels in the blood and cerebrospinal fluid (CSF). It also noted that patients taking selenium alone often showed greater improvements in cognitive scores (such as the MMSE and ADAS-Cog) than those taking selenium as part of a broader multivitamin, possibly due to dosage or absorption competition.

Solovyev, N. D. (2015). Importance of selenium and selenoprotein for brain function: From antioxidant protection to neuronal signalling. Journal of Inorganic Biochemistry, 153, 1–12.

Transcript Context: Cited to explain the biochemical mechanisms of selenium in the brain, specifically regarding the "nigrostriatal pathway" in Parkinson's and protection against neurotoxins. Key Findings: This review paper details how selenoproteins (like glutathione peroxidase) protect neurons from oxidative damage and modulate neurotransmission. It highlights selenium’s specific role in preserving the dopamine pathways involved in Parkinson’s disease and its ability to chelate and protect against neurotoxins like mercury and lead.

Hashtags: #Selenium, #BrainHealth, #Alzheimers, #Parkinsons, #Neuroprotection

Building Better Energy

Exercise strengthens mitochondria - Image from chatGPT

How to Grow and Strengthen Your Mitochondria for Better Health and Vitality

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By John Fisher (assisted by AI)

Mitochondria are the tiny powerhouses inside your cells that turn food and oxygen into energy. When they work well—and when you have enough of them—you feel stronger, clearer, and more resilient. When they struggle, you feel tired, sluggish, and less able to recover. The good news is that your body can build new mitochondria and make existing ones work better through simple daily habits. This process, called mitochondrial biogenesis, is one of the most powerful natural tools for improving long-term health, energy, and aging.

Below is a clear, practical guide to the proven ways you can strengthen your mitochondria and boost your body’s natural energy production.

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1. Move Your Body With Aerobic Exercise

Aerobic exercise—walking, cycling, swimming, or jogging—is the most reliable way to build new mitochondria. When your muscles need more oxygen, your cells respond by growing additional energy factories to meet the demand.

How to do it:

• 20–40 minutes per session

• 3–5 days per week

• Moderate pace (you can talk but not sing)

Even a brisk daily walk begins to spark mitochondrial growth.

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2. Add Some High-Intensity Intervals

Short bursts of higher effort trigger powerful cellular signals (such as PGC-1α) that tell your body to make more mitochondria. You don’t need much—just consistency.

Simple interval example:

• 30 seconds fast

• 1–2 minutes slow

• Repeat 6–10 times

This boosts both the number and efficiency of mitochondria.

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3. Strength Training Helps Too

While not as dramatic as cardio or intervals, strength training improves mitochondrial function—especially as we age. Stronger muscles contain healthier, more efficient mitochondria.

Try:
Two to three sessions per week of basic resistance exercises (squats, bands, light weights).

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4. Eat Foods That Feed Your Mitochondria

Your diet gives mitochondria the raw materials they need to produce energy and repair themselves.

Key nutrients include:

• Omega-3 fats: salmon, walnuts, chia seeds

• Antioxidants: berries, leafy greens

• CoQ10: meat, fish, or supplements

• B vitamins: eggs, whole grains

• Magnesium: nuts, seeds, beans

These foods reduce oxidative stress and strengthen energy production at the cellular level.

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5. Use the Power of Fasting

Allowing your body a longer break between meals activates pathways that repair old mitochondria and stimulate the creation of new ones. A simple 12–14 hour overnight fast is enough.

Example:
Finish dinner by 7 p.m., eat breakfast at 8 or 9 a.m.

This gentle fasting window promotes cellular cleanup and improved metabolic health.

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6. Prioritize Quality Sleep

During deep sleep, your body repairs damaged mitochondria and builds new ones. Without good sleep, energy production suffers—no matter how healthy your other habits are.

Aim for 7–9 hours, with regular bed and wake times.

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7. Manage Stress Before It Manages You

Chronic stress hormones interfere with mitochondrial function, reduce energy, and increase inflammation. Simple daily calming routines help reverse this.

Helpful practices:

• Slow walks

• Prayer

• Deep breathing

• Meditation

• Quiet reflective time

Even five minutes makes a difference.

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8. Avoid What Damages Mitochondria

Some habits directly harm your cells’ ability to produce energy. Avoiding these preserves the progress you’re making.

Major offenders include:

• Smoking

• Heavy alcohol use

• Chronic overeating

• Highly processed foods

• Regular sleep deprivation

Protecting your mitochondria is as important as building them.

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Conclusion

Your mitochondria drive nearly everything your body does—movement, healing, thinking, and staying alive. By exercising regularly, eating nutrient-rich foods, getting enough sleep, managing stress, and avoiding harmful habits, you create the ideal environment for your cells to produce strong, steady energy. These simple steps help you feel more alive today while supporting healthier aging for years to come. Small daily habits, multiplied over time, can transform your energy from the inside out.

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Reference: Krupnick, M.J. (2025, August 8). Do mitochrondria hold the power to heal? Harvard Magazine. https://www.harvardmagazine.com/research/harvard-research-mitochondria-cells-healing

Brains Grow Differently

 

By John R. Fisher, PhD (assisted by AI)

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Introduction

Parents, teachers, and anyone who has raised teenagers have probably noticed it: girls often seem to mature earlier, while young men may take a bit longer to reach the same level of judgment, impulse control, and emotional steadiness. This difference isn’t just social—it’s biological. Modern neuroscience shows that although everyone develops through the same stages, the timing of brain maturation is different for men and women. Understanding these patterns helps us appreciate why young adults think and act the way they do—and how we can support them along the way.

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The Prefrontal Cortex: The Last Piece to Finish

The prefrontal cortex is the part of the brain responsible for:

• decision-making

• managing emotions

• impulse control

• long-term planning

This area matures last, and its development shapes the “adult” mind.

Women Mature Earlier (Around 21–23)

Research using MRI scans shows that women typically complete key brain-development processes earlier. These include:

• myelination, which strengthens neural pathways

• synaptic pruning, which removes unused or inefficient connections

Because puberty also begins earlier for girls, hormones such as estrogen help accelerate emotional regulation and executive function.

Men Mature Later (Around 25–27)

For men, the same processes occur—but they take longer. Testosterone surges begin later and influence brain development over a longer period. As a result:

• impulse control develops more gradually

• risk-taking tendencies last longer

• emotional regulation stabilizes later

Why the Difference?

The gap reflects natural biological pacing. Girls move through developmental stages sooner, which pushes brain maturation earlier. Boys move through these stages later, creating a longer runway to reach full adult neurological function.

How This Plays Out in Real Life

These biological timelines help explain common patterns:

• Young women often display stronger planning and emotional self-management in their early 20s.

• Young men may be more likely to take risks and act impulsively until their mid-20s.

• By the late 20s, both sexes reach similar levels of mature cognitive functioning.

These are trends, not rules—every individual is different. But the general patterns hold across populations.

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Conclusion

Men and women reach full brain maturity on different timelines, but both follow a predictable developmental arc. Recognizing these differences helps parents, leaders, and young adults themselves understand that maturity is not just a choice—it’s a process shaped by biology. When we appreciate how the brain grows, we respond with more patience, more compassion, and better support for young people navigating the transition into adulthood. Ultimately, understanding brain development helps us live better—not by judging differences, but by respecting them.

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References

Lenroot, R. K., & Giedd, J. N. (2010). Sex differences in the adolescent brain. Brain and Cognition, 72(1), 46–55. https://doi.org/10.1016/j.bandc.2009.10.008

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Additional Supporting References

Giedd, J. N. (2008). The teen brain: Insights from neuroimaging. Journal of Adolescent Health, 42(4), 335–343. https://doi.org/10.1016/j.jadohealth.2008.01.007

De Bellis, M. D., & Keshavan, M. S. (2003). Sex differences in brain maturation in youth: A structural MRI study. Cerebral Cortex, 13(12), 1284–1291. https://doi.org/10.1093/cercor/bhg102

Communication in Healthcare

 

What we can learn from clinicians about handling emotions in tough situations?

By Dr. John Fisher (assisted by AI)

Communication in healthcare involves more than sharing information. It is emotional work. Clinicians often face fear, grief, frustration, anger, and confusion—both from patients and within themselves. Their ability to manage their own emotions directly affects communication quality, patient safety, and their own well-being.

A study by Luff et al. (2016) shows how clinicians handle their emotions during difficult conversations. The researchers identify several practical strategies that help clinicians stay calm, clear, and professional.

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1. Stepping Back Helps Clinicians Stay Grounded

Luff et al. (2016) found that clinicians often pause before they respond. Even a brief moment—a breath or a short silence—helps them stay steady instead of reacting too quickly.

This reflects emotion regulation theory, which explains how people manage feelings before they express them. Pausing is an example of antecedent-focused regulation because the clinician redirects emotion before it grows stronger.

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2. Cognitive Reframing Reduces Distress

The study also showed that clinicians use cognitive reframing. They remind themselves that strong emotions from patients or families are about the situation, not about them personally.

This mental shift helps them stay calm and compassionate. It reduces defensiveness and allows clearer communication. This strategy fits Gross’s (1998) idea that reframing is one of the most effective ways to manage strong emotions.

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3. Debriefing With Colleagues Builds Emotional Control

Another important strategy in the study was debriefing. After a difficult conversation, clinicians talk with a colleague to release tension and gain perspective. Luff et al. (2016) found that this helps clinicians:

• process emotions safely

• prevent emotional overload

• reflect on the situation

• communicate more effectively in the future

This shows that emotional support within the healthcare team improves communication with patients.

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4. Self-Management Improves Empathy and Clarity

Clinicians who manage their emotions well communicate more effectively. Luff et al. (2016) found that they show more empathy, calmness, clarity, and professionalism during stressful moments.

This ties to emotional labor theory (Hochschild, 1983). Healthcare workers often must appear calm even when they feel stressed. The study shows that they can do this in a healthy way—by regulating emotion rather than suppressing it.

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Why This Matters

Strong communication depends on how a message is delivered, not only on the words used. When clinicians manage their emotions well, they:

• prevent conflict

• make room for patient concerns

• build trust

• reduce their own stress

• support safer decision-making

The findings from Luff et al. (2016) highlight how closely emotional skills and communication skills are connected.
With rising burnout in healthcare, learning to manage emotions during communication is no longer optional—it is essential.

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Reference

Luff, D., Martin, E. B., Jr., Mills, K., Mazzola, N. M., Bell, S. K., & Meyer, E. C. (2016). Clinicians’ strategies for managing their emotions during difficult healthcare conversations. Patient Education and Counseling, 99(9), 1461–1466. https://doi.org/10.1016/j.pec.2016.06.017