The link between testosterone and brain function becomes more important as men get older. About 20% of men deal with testosterone deficiency at the time they reach 60. This number jumps to 50% by age 80. Men's cognitive performance changes noticeably during this hormonal decline. Their bodies show various functional declines that come with age, including changes in how their brain works.
Research shows that older men with low testosterone levels face a substantially higher risk of Alzheimer's disease. A meta-analysis revealed their risk increases by 48%. The biological connection between andropause and cognitive decline is clear. Men's testosterone levels drop and their cognitive function declines at the same time as they age. The relationship between testosterone and brain fog isn't simple though. A newer study, published by researchers showed an inverted 'U' shaped pattern between blood testosterone levels and cognitive function in older men. Early evidence points to testosterone loss as a possible risk factor for cognitive decline and dementia. Some studies raise concerns about testosterone supplementation and its impact on heart health, which could affect Alzheimer's risk.
Understanding Testosterone’s Role in the Ageing Brain: Testosterone and Brain Function
Men's testosterone production steadily declines after their sixth decade, and this affects their brain health substantially. Their bodies naturally change hormone levels, which creates ripple effects throughout the body, especially in how the brain works. Men experience a slow but constant decrease in this vital hormone that affects many brain functions, unlike women who go through dramatic hormone changes during menopause.
How testosterone levels change after 60
The male body follows a predictable pattern of hormone decline as it ages. Testosterone levels typically decrease by approximately 1-2% annually after age 30, with bigger drops happening after 60. A man at 70 has about half the testosterone he had in his 20s. This gradual reduction, sometimes called the "testosterone cliff," becomes steeper between ages 65-70.
Several factors cause this decline. The testicles naturally produce less testosterone with age. The body also makes more sex hormone-binding globulin (SHBG), which binds to free testosterone and reduces its availability for biological functions. The body converts more testosterone to estradiol in older men, which further reduces active testosterone levels.
These changes show up differently in each person. Your genes, lifestyle choices, and overall health affect how much and how fast testosterone drops. Men who stay at a healthy weight, exercise often, and handle stress well usually see less dramatic hormone changes. You can still maintain healthy testosterone levels with the right approach, even though it gets harder with age.
Why cognitive decline becomes more common with age
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Brain function naturally changes as we age, and various mechanisms contribute to this decline. The ageing brain goes through many physical changes - it shrinks overall, loses grey matter density, and has fewer connections between neurons. These physical changes directly affect how well different parts of your brain work.
Age-related processes speed up cognitive challenges:
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Less blood flows to the brain, reducing nutrient delivery to brain tissues
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Oxidative stress builds up and damages neural structures
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The brain becomes less adaptable
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More inflammation interferes with how neurons communicate
Testosterone seems to play a big role in these changes. The brain has testosterone receptors throughout, especially in areas that handle memory, spatial reasoning, and executive function. These brain regions get less hormonal support as levels drop, which might speed up age-related changes.
Research shows that men with higher testosterone levels often keep their cognitive abilities better. This protective effect helps most with verbal memory, visual-spatial skills, and executive function. In spite of that, the relationship isn't straightforward—very low and unusually high levels can both harm cognitive health.
Link between andropause and brain function
Andropause—men's version of menopause—describes the symptoms that come with age-related testosterone decline. Men experience these changes slowly over decades, unlike the quick hormone shifts women face during menopause. The slower progression means symptoms develop subtly, making them easy to mistake for "normal ageing" instead of hormone changes.
Cognitive symptoms of andropause often include trouble remembering things, poor concentration, and slower thinking speed. Many men say they experience "brain fog"—they find it frustrating when they can't think clearly, which affects their daily life. These brain changes happen along with other andropause symptoms like low energy, more body fat, and mood swings.
Testosterone connects to brain function through several pathways. It helps neurons grow and stay healthy through various protective mechanisms. It also helps brain cells' mitochondria work properly, ensuring they have enough energy for thinking processes. Testosterone affects neurotransmitter systems too, especially dopamine and serotonin, which control mood and executive function.
Studies have shown that men with andropause symptoms have measurable differences in brain scans compared to men their age with normal testosterone levels. These differences especially affect the hippocampus and prefrontal cortex—areas vital for forming memories and making complex decisions. Some studies suggest that treating low testosterone might improve certain aspects of brain function, though results vary a lot between individuals.
Omega-3 fatty acids and B-vitamins help both testosterone metabolism and brain health, creating more ways to address andropause's cognitive effects through nutrition alongside other natural remedies for male andropause.
How Testosterone Affects Memory and Thinking
Testosterone deficiency affects more than just physical health - it changes how men's brains work as they age. Research shows this hormone plays a key role in brain functions. It affects memory and how well someone makes complex decisions.
Testosterone and memory loss: what we know
Scientists have found interesting links between testosterone and memory. Men with low testosterone often have trouble with spatial and verbal memory. Those who get testosterone replacement therapy usually see their memory skills improve [1]. This connection becomes more obvious in older men.
Studies about how testosterone affects memory show mixed results. The relationship isn't straightforward. Large-scale studies found a quadratic, inverted U-shaped association between testosterone levels and memory performance [2]. This means there's likely a sweet spot for testosterone levels. Too little or too much testosterone might hurt memory function.
Research has shown positive links between bioavailable testosterone levels and different types of memory - verbal, working, and visual [2]. Men who have symptoms of low testosterone often notice memory problems along with other signs of andropause.
Impact on executive function and decision-making
Executive function includes several brain operations we need to achieve our goals. These include focusing attention, controlling impulses, and working memory [3]. The prefrontal cortex and striatal regions handle these tasks. These brain areas have many testosterone receptors.
Clinical evidence shows that low testosterone (hypogonadism) can hurt executive function [3]. Men with low testosterone levels often:
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Struggle with complex decisions
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Have trouble managing emotions
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Find it hard to focus on tasks
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Process information slowly
Research shows dopamine in the prefrontal-striatal circuit helps with decision-making [3]. Testosterone affects dopamine signals, so low levels can disrupt these important brain processes.
A fascinating discovery shows that higher testosterone might reduce careful thinking in some cases. A study of 250 young men showed that those who got testosterone did worse on cognitive reflexion tests. They tended to give quick but wrong answers [4]. This suggests the best testosterone brain function needs balance rather than high levels.
Brain fog vs dementia: key differences
Men who experience brain fog low testosterone sometimes worry they're getting dementia. It helps to know the differences between these conditions to get the right treatment.
Brain fog means temporary thinking problems, fuzzy thoughts, and mental tiredness. It's frustrating but usually doesn't stop daily activities [5]. Dementia works differently - it steadily damages multiple brain functions and makes it hard to live independently [5].
These conditions differ in several ways:
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Progression pattern: Brain fog comes and goes and can get better with treatment. Dementia gets worse over time [6].
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Functional impact: Brain fog makes tasks harder but doable. Dementia eventually prevents basic tasks [5].
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Recovery of abilities: Brain fog improves and memory returns. Dementia causes permanent loss of abilities [6].
Research about testosterone Alzheimer's risk suggests balanced hormone levels might help protect the brain. Studies indicate testosterone might reduce β-amyloid buildup in the brain - a substance linked to Alzheimer's disease [7]. Testosterone also helps brain cells grow and stay healthy through various protective actions.
Brain health during andropause needs different approaches. B-vitamins and testosterone metabolism work together closely, so good nutrition matters. Omega-3 fatty acids help both brain function and hormone production. These nutrients might help with andropause cognitive decline.
Scientific Evidence Linking Testosterone and Dementia
"The results suggest that short-term testosterone administration enhances cognitive function in healthy older men. However, it remains unclear whether these improvements in cognition are attributable to increased testosterone or estradiol levels, or both." — Neurology Research Team, Peer-reviewed neurology research from American Academy of Neurology
Scientists are learning more about the concrete links between testosterone levels and dementia risk. A newer body of research shows complex relationships that go beyond simple correlations. These studies gave an explanation about how sex hormones might affect long-term brain health.
Studies on testosterone and Alzheimer's risk
The UK Biobank study represents the largest investigation of testosterone-dementia connections. This research tracked 159,411 community-dwelling men for 7 years. The results showed that men with lower total testosterone had a 43% higher risk of developing dementia. These men also faced an 80% higher risk of Alzheimer's disease compared to those with the highest testosterone levels [8].
Several other significant studies support these findings:
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The Baltimore Longitudinal Study of Ageing showed that men with higher ratios of testosterone to sex hormone-binding globulin (SHBG) scored better on cognitive tests. These men were less likely to develop Alzheimer's disease during extended follow-up periods of 10 and 19 years [9].
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The Health In Men Study looked at 4,069 men aged 71-88 years. The results found that lower testosterone concentrations at baseline linked to higher risk of incident dementia during the 10.5-year follow-up period [9].
The Honolulu-Asia Study presents different results. This study found no connection between baseline testosterone and Alzheimer's risk after following participants for 6 years [9]. These conflicting outcomes suggest other factors might play a role.
The inverted U-shaped relationship explained
A vital discovery in recent research identifies an inverted U-shaped relationship between testosterone levels and cognitive function in older men [10]. This non-linear pattern helps explain why earlier studies often showed contradictory results.
The inverted U-shaped pattern reveals that both low and extremely high testosterone levels may harm cognitive function [11]. One study highlighted this relationship between testosterone concentration and Mini-Mental State Examination (MMSE) scores in men with vascular risk factors [11].
This nuanced relationship stands out in specific conditions:
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Men with vascular risk factors show an optimal testosterone range for cognitive performance [11].
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The pattern becomes clearer when looking at free testosterone instead of total testosterone [12].
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The relationship changes based on existing cognitive status, showing different patterns for those with and without mild cognitive impairment [9].
Yes, it is this non-linear association that explains why some studies show improved cognitive performance with higher testosterone while others report negative effects or no relationship.
Testosterone dementia prevention: myth or fact?
Scientists still ask whether testosterone can actively prevent dementia. Current evidence points toward a protective role rather than definitive prevention.
Multiple cellular and animal studies show testosterone's neuroprotective properties. Research indicates testosterone reduces amyloid-beta production, improves synaptic signalling, and fights neuronal death [13]. The mechanisms show testosterone gets more microglia phagocytosis and thus encourages more removal of amyloid-beta deposits while inhibiting inflammatory responses [13].
Testosterone protects brain cells by:
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Removing free radicals and improving synaptic plasticity [13]
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Making neuronal bioenergetics better through improved mitochondrial function [13]
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Boosting antioxidant activity to prevent neurodegenerative disorders [13]
Clinical evidence remains mixed despite these promising mechanisms. The strongest evidence comes from studies of men with prostate cancer who undergo androgen deprivation therapy (ADT). These men show a higher incidence of dementia and Alzheimer's disease [13]. Testosterone supplementation studies in men with cognitive impairment have shown mixed results.
A comprehensive strategy might work best. This approach combines appropriate testosterone support with nutritional support through B-vitamins and Omega-3 fatty acids. These nutrients support both brain health and testosterone metabolism.
How Hormones Protect Brain Cells
Testosterone is a vital defender of neural health at the cellular level. It protects through multiple biochemical pathways. Research shows these protective mechanisms become more important as men age and could provide targets to fight cognitive decline.
Testosterone's role in reducing oxidative stress
The ageing male brain faces growing threats from oxidative stress—an imbalance between reactive oxygen species production and the body's ability to neutralise them. Studies show testosterone supplementation reduces whole-body oxidative damage by a lot in ageing men with central obesity [14]. A clinical trial found that 24 weeks of testosterone replacement therapy reduced oxidative stress markers compared to placebo. This reduction likely happened through improved body composition [15].
This protection works through several mechanisms. Testosterone improves antioxidant activity and helps regulate redox homeostasis in brain tissue [16]. It makes mitochondrial function better and boosts ATP production needed for optimal neural activity [16]. The hormone actively removes free radicals to prevent cellular damage that leads to cognitive decline [16].
The relationship depends on dosage. Testosterone decreases intracellular oxidative stress at lower concentrations. However, excessive levels (≥500 nmol/L) might increase oxidative damage [14].
Neuroprotection through synaptic plasticity
Testosterone supports brain health by maintaining synaptic connections. Research with Golgi staining techniques shows testosterone increases dendritic spine density in the hippocampal CA1 region—a brain area vital for memory formation [17]. Androgen receptors make this possible. Blocking these receptors with flutamide stops these beneficial changes [17].
Several key pathways are the foundations of these improvements:
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Increased expression of brain-derived neurotrophic factor (BDNF) [17]
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Elevated levels of postsynaptic density protein 95 (PSD-95) [17]
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Enhanced phosphorylation of cyclic-AMP response element binding protein (CREB) [17]
These changes strengthen neural connections together. They might explain how testosterone supports memory and cognitive function as men age.
Interaction with dopamine and mood regulation
Testosterone's relationship with neurotransmitters adds another layer of brain protection. Research shows the hormone improves dopamine production and receptor sensitivity in key brain regions associated with motivation and reward [18]. This interaction helps explain why low testosterone associates with mood disorders, including depression—a connection explored in depth at [Goldman Laboratories](https://goldmanlaboratories.com/blogs/blog/testosterone-depression-men).
Testosterone promotes healthy dopamine activity without oxidative stress [10]. However, it moves toward limiting dopamine-induced negative effects when oxidative stress increases [10]. This dual action shows testosterone's adaptive regulatory function in the brain.
Sex and stress hormone systems work closely together, especially during challenging periods when both systems are highly involved [19]. This interaction matters more during ageing as stress management abilities naturally decline.
Proper nutrition helps support these protective mechanisms. B-vitamins and Omega-3 fatty acids support both testosterone metabolism and brain protection. They might offer additional ways to boost testosterone's neuroprotective effects beyond hormone replacement alone.
Nutrition and Supplements for Brain and Hormone Health
Image Source: Healthcare 360 Magazine
Nutrition is the life-blood of hormonal balance and brain health as men get older. What you eat can speed up or reduce how declining testosterone affects your brain health. A detailed approach to healthy ageing must include the right nutritional strategies.
Omega-3 fatty acids and cognitive support
Your brain has high levels of omega-3 fatty acids. DHA makes up about 40% of all fatty acids in brain tissue [20]. These fats are vital to keep nerve cell membranes healthy and control inflammation that affects how your brain works.
Studies show omega-3 supplements boost learning, memory, brain health, and blood flow to the brain [20]. A long-term study of 103,651 people found that eating omega-3 fatty acids can cut the risk of dementia or cognitive decline by about 20% [21]. People who added just 0.1g of DHA or EPA to their daily diet lowered their risk of cognitive decline by 8-9.9% [21].
Great food sources include:
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Fatty fish (salmon, mackerel, sardines)
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Flaxseeds and chia seeds
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Walnuts and hemp seeds
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Algae-based supplements (particularly for vegans)
Men worried about testosterone-related memory loss might benefit from taking 3g of omega-3 daily, as the FDA recommends [20].
B-vitamins and testosterone metabolism
B-vitamins connect hormone health to brain function. Vitamin B12 is vital for DNA creation, cell metabolism, and methylation that helps make hormones [22]. Men with fertility issues often have low vitamin B12, which links to testosterone deficiency and hormone problems [23].
Vitamin B6 (pyridoxine) helps many enzymes make testosterone [24]. This vitamin powers up enzymes like 5-alpha-reductase and 17-beta-hydroxysteroid dehydrogenase that create testosterone [24]. It also helps testosterone metabolism by controlling prolactin through dopamine production.
B-vitamins also help lower homocysteine levels. High homocysteine can disrupt hormone production and lead to andropause cognitive decline [22].
Other nutrients that support brain ageing
Many more nutrients protect against age-related brain changes. Vitamin E acts as a strong antioxidant. Older adults with more vitamin E in their blood show better cognitive performance [25]. This likely happens because vitamin E reduces oxidative stress and helps move fatty acids needed for testosterone brain function.
Choline plays two key roles in brain health. It helps make phosphatidylcholine, the main fat in cell membranes, and acetylcholine, a key brain messenger [25]. Research shows choline improves thinking and memory, which might help with brain fog low testosterone symptoms.
Iron supports brain health by carrying oxygen and helping enzymes work. Not having enough iron can affect movement and thinking, including coordination, decision-making, and memory [26].
The overall diet pattern matters more than single nutrients. Traditional Mediterranean and Japanese diets cut depression risk by 25-35% compared to Western diets [27]. This suggests that broader nutrition choices can improve both mood and thinking as you age.
Lifestyle Habits That Support Brain Health After 60
Lifestyle choices can powerfully affect hormonal balance and brain health in men over 60. Good habits help maintain testosterone levels among other aspects of brain health. This creates a positive cycle that keeps the mind sharp.
Exercise and testosterone levels
Resistance training proves most effective to maintain healthy testosterone production as men age. Studies demonstrate that moderate to high-intensity resistance exercises with large muscle groups, like squats and bench presses, yield the best hormonal benefits [28]. Men can see a big difference in their testosterone levels by lifting weights just twice a week for 30 minutes [29].
Strength training works better than cardio, which might lower testosterone levels [30]. The best approach combines moderate weight training and limited cardio workouts.
Sleep, stress, and hormonal balance
Sleep quality plays a crucial role in testosterone production, as most release happens during REM sleep [28]. Poor sleep patterns disrupt hormonal rhythms and metabolism [7]. Men who don't get enough sleep show noticeable drops in testosterone production [29].
Chronic stress raises cortisol levels and interferes with testosterone production [28]. These hormones work like a seesaw - higher cortisol usually means lower testosterone [31].
Mental stimulation and cognitive training
Brain exercises are a great way to get cognitive protection. Research shows that three 30-minute brain training sessions weekly create small but valuable improvements in thinking and memory [32]. A six-week study showed daily brain exercises enhanced thinking, memory and focus in adults over 50 [33].
Brain training works best when it adapts to your level, includes at least ten sessions, and takes place in groups if possible [34].
Conclusion
The link between testosterone and cognitive function after age 60 is a vital part of male ageing. Without doubt, evidence suggests testosterone protects brain health, but the relationship follows an inverted U-shaped pattern instead of a simple linear correlation. Men who experience andropause symptoms might notice cognitive changes among other physical symptoms. These cognitive challenges don't have to be an inevitable part of ageing.
Research shows that optimal testosterone levels—neither too high nor too low—help memory, executive function, and overall cognitive performance. Testosterone protects brain cells through several mechanisms. It reduces oxidative stress, boosts synaptic plasticity, and improves neurotransmitter regulation. These protective effects explain why men with healthy testosterone levels show greater resistance to age-related cognitive changes and possibly face lower dementia risk.
An all-encompassing approach to brain fog and testosterone requires several lifestyle changes. Resistance training emerges as the most effective way to maintain both cognitive function and hormone balance. Quality sleep and stress management create the right conditions for hormone production. B-vitamins and Omega-3 fatty acids provide the building blocks needed for hormone metabolism and brain cell maintenance.
Brain health and testosterone's connection after 60 is a vital yet often overlooked aspect of male ageing. Natural testosterone decline comes with age, but you can address cognitive effects through targeted approaches. Men who notice cognitive symptoms among other signs of andropause should ask healthcare providers about complete strategies that balance hormones and brain health.
Some people worry about testosterone supplementation after 70, especially regarding heart health risks. Many men still benefit from appropriate interventions matched to their health profiles. The key lies in finding the right balance—supporting healthy testosterone levels while using complementary strategies to protect cognitive function as you age.
Key Takeaways
Understanding the connection between testosterone and brain health after 60 can help men take proactive steps to protect their cognitive function as they age.
• Testosterone levels decline 1-2% annually after 30, with steeper drops after 60, directly impacting memory and executive function • Research shows an inverted U-shaped relationship—both very low and excessively high testosterone levels can impair cognitive performance • Men with lower testosterone face 43% higher dementia risk and 80% increased Alzheimer's risk compared to optimal levels • Resistance training twice weekly for 30 minutes effectively maintains testosterone whilst supporting brain health in ageing men • Omega-3 fatty acids and B-vitamins provide dual benefits, supporting both testosterone metabolism and cognitive protection
The key lies in achieving hormonal balance rather than maximisation. Combining targeted nutrition, regular resistance exercise, quality sleep, and stress management creates a comprehensive approach to preserving both testosterone levels and cognitive vitality throughout the ageing process.
FAQs
Q1. How does testosterone affect cognitive function in older men? Testosterone plays a significant role in cognitive function for men over 60. It supports memory, executive function, and overall cognitive performance. Research shows an inverted U-shaped relationship, meaning both very low and excessively high levels can impair cognitive abilities. Maintaining optimal testosterone levels may help protect against age-related cognitive decline.
Q2. Can low testosterone increase the risk of dementia? Yes, studies have shown that men with lower testosterone levels face an increased risk of developing dementia. Research from the UK Biobank study found that men with lower total testosterone had a 43% higher risk of dementia and an 80% increased risk of Alzheimer's disease compared to those with the highest testosterone levels.
Q3. What lifestyle changes can help maintain healthy testosterone levels and brain function? Regular resistance training, quality sleep, and stress management are key lifestyle factors that support both testosterone levels and brain health. Engaging in moderate to high-intensity resistance exercises twice weekly for 30 minutes can significantly benefit testosterone production. Additionally, maintaining a healthy diet rich in omega-3 fatty acids and B-vitamins can support both hormone metabolism and cognitive function.
Q4. Is testosterone replacement therapy effective for improving cognitive function? The effectiveness of testosterone replacement therapy for cognitive function is still debated. While some studies show improvements in memory and cognitive performance with testosterone supplementation, results are mixed. The relationship between testosterone and cognition is complex, and therapy should be considered on an individual basis under medical supervision.
Q5. How can I tell if my cognitive issues are related to low testosterone or dementia? Distinguishing between cognitive issues related to low testosterone and dementia can be challenging. Low testosterone often causes temporary cognitive difficulties like brain fog, which can improve with treatment. Dementia, on the other hand, involves progressive deterioration across multiple cognitive domains and significantly impacts daily functioning. If you're experiencing persistent cognitive issues, it's important to consult a healthcare professional for a proper evaluation.
References
[1] - https://news.happyneuronpro.com/how-low-testosterone-can-affect-cognition/
[2] - https://pmc.ncbi.nlm.nih.gov/articles/PMC5079177/
[3] - https://www.frontiersin.org/journals/endocrinology/articles/10.3389/fendo.2018.00279/full
[4] - https://knowledge.wharton.upenn.edu/article/testosterone-decision-making/
[5] - https://www.ohsu.edu/womens-health/brain-fog-vs-dementia
[6] - https://www.psychologytoday.com/gb/blog/breathe-mama-breathe/202411/is-it-brain-fog-or-dementia
[7] - https://pmc.ncbi.nlm.nih.gov/articles/PMC4377487/
[8] - https://alz-journals.onlinelibrary.wiley.com/doi/10.1002/alz.12529
[9] - https://pmc.ncbi.nlm.nih.gov/articles/PMC9789006/
[10] - https://www.sciencedirect.com/science/article/abs/pii/S0165178125003142
[11] - https://pmc.ncbi.nlm.nih.gov/articles/PMC10865607/
[12] - https://alz-journals.onlinelibrary.wiley.com/doi/10.1002/alz.13889
[13] - https://pmc.ncbi.nlm.nih.gov/articles/PMC8987133/
[14] - https://onlinelibrary.wiley.com/doi/10.1111/andr.13458
[15] - https://pubmed.ncbi.nlm.nih.gov/37177884/
[16] - https://www.frontiersin.org/journals/endocrinology/articles/10.3389/fendo.2020.586909/full
[17] - https://pubmed.ncbi.nlm.nih.gov/27599230/
[18] - https://maleexcel.com/blog/health/testosterones-interaction-with-dopamine-and-serotonin/
[19] - https://pmc.ncbi.nlm.nih.gov/articles/PMC3967083/
[20] - https://pmc.ncbi.nlm.nih.gov/articles/PMC9641984/
[21] - https://www.sciencedirect.com/science/article/pii/S0002916523463204
[22] - https://www.frontiersin.org/journals/nutrition/articles/10.3389/fnut.2025.1579531/full
[23] - https://mes-global.com/blog/understanding-the-link-between-vitamin-b12-and-testosterone/
[24] - https://wjmh.org/DOIx.php?id=10.5534/wjmh.240250
[25] - https://pmc.ncbi.nlm.nih.gov/articles/PMC11109270/
[26] - https://pmc.ncbi.nlm.nih.gov/articles/PMC10083484/
[27] - https://www.health.harvard.edu/blog/nutritional-psychiatry-your-brain-on-food-201511168626
[28] - https://www.health.harvard.edu/mens-health/lifestyle-strategies-to-help-prevent-natural-age-related-decline-in-testosterone
[29] - https://healthcare.utah.edu/the-scope/health-library/all/2025/07/lifestyle-changes-can-increase-testosterone-levels-older-men
[30] - https://www.healthline.com/health/does-working-out-increase-testosterone
[31] - https://www.healthline.com/nutrition/8-ways-to-boost-testosterone
[32] - https://www.alzheimers.org.uk/about-dementia/managing-the-risk-of-dementia/additional-treatments-for-dementia-risk/brain-training
[33] - https://evidence.nihr.ac.uk/alert/brain-training-improved-thinking-memory-and-attention-in-older-people/
[34] - https://pubmed.ncbi.nlm.nih.gov/24607830/
