Neuroplasticity

Neuroplasticity: A Nutrition and Natural-Health Reference

1. Definition and Overview

Neuroplasticity, also known as neural plasticity or brain plasticity, is a process that involves adaptive structural and functional changes to the brain. A precise working definition is "the ability of the nervous system to change its activity in response to intrinsic or extrinsic stimuli by reorganizing its structure, functions, or connections." Clinically, it describes processes of brain change after injury such as stroke or traumatic brain injury (TBI).

Neuroplasticity refers to the ability of the brain to reorganize and modify its neural connections in response to environmental stimuli, experience, learning, injury, and disease processes. It encompasses a range of mechanisms, including changes in synaptic strength and connectivity, the formation of new synapses, alterations in the structure and function of neurons, and the generation of new neurons.

Neuroplasticity plays a crucial role in developing and maintaining brain function, including learning and memory, as well as in recovery from brain injury and adaptation to environmental changes.

The first mention of the term "plasticity" in regards to the nervous system was by William James in 1890. The term "neural plasticity" is credited to Jerzy Konorski in 1948 and was popularized by Donald Hebb in 1949.

2. How Neuroplasticity Presents: Forms and Manifestations

Neuroplasticity can be broken down into two major mechanisms: (1) Neuronal regeneration and collateral sprouting, which includes synaptic plasticity and neurogenesis; and (2) Functional reorganization, which encompasses concepts such as equipotentiality, vicariation, and diaschisis.

These changes can be beneficial (restoration of function after injury), neutral (no change), or negative (pathological consequences).

Biochemical processes in synapses and other neuronal compartments underlie neuroplasticity — functional and structural alterations in the brain enabling adaptation to the environment, learning, memory, and rehabilitation after brain injury. This basic molecular level of brain plasticity covers numerous specific proteins (enzymes, receptors, structural proteins, etc.) participating in many coordinated and interacting signal and metabolic processes, whose modulation forms the molecular basis for brain plasticity.

Neuroplasticity is most robust during development but persists throughout life. This fact has significant implications for understanding brain function, recovery from brain injury, and potentially treating neurological and psychiatric disorders.

2.1 Synaptic Plasticity and Long-Term Potentiation

Synaptic plasticity refers to changes in the strength and efficiency of synaptic connections. Molecules integral to synaptic plasticity include those involved in the formation of new dendritic spines, increasing the concentration of post-synaptic receptors, and regulation of synapse proliferation and apoptosis through gene transcription. Long-term potentiation (LTP) — a persistent strengthening of synaptic connections following repeated stimulation — is considered a fundamental cellular mechanism underlying learning and memory.

2.2 Neurogenesis

Neurogenesis and neuroplasticity are crucial for the maintenance of hippocampal function; alterations are related to memory deficits. Neurogenesis and synaptic plasticity are negatively regulated by age and stress, and are increased by exercise, drugs, and physiological activation. Neurogenesis involves a balance between neural stem cell proliferation, migration, differentiation into neurons, and regulation of hippocampus-dependent learning and memory processes.

2.3 Functional Reorganization

Recent advances in neuroimaging and direct brain mapping have shown that the brain is capable of significant redistribution of function in response to injury. This remodeling, termed neuroplasticity, occurs continuously throughout life. Through similar mechanisms activated following brain injury, neuroplasticity is also crucial for optimization of neuronal signaling.

3. Body Systems Involved

Neuroplasticity is primarily a property of the central nervous system, but it intersects with and is modulated by several other body systems:

• Central Nervous System (CNS): Depression and cognitive disorders are closely related to abnormal neural plasticity processes occurring in the prefrontal cortex and limbic system, including the hippocampus and amygdala.
• Neurotrophic Signaling: Brain-derived neurotrophic factor (BDNF) in particular is associated with the modulation of neuroplasticity, which promotes the health of nervous tissue and has the ability to counteract the effects of pro-inflammatory cytokines, which are key factors in neurodegenerative processes.
• Immune and Inflammatory Systems: A number of factors play a role in the biological processes underlying the changing of neural networks in the brain, including synapse regulation via phosphorylation, the role of inflammation and inflammatory cytokines, proteins such as Bcl-2 proteins and neurotrophins, energy production via mitochondria, and acetylcholine.
• Endocrine System: Hormonal fluctuations, including variations in estrogen and testosterone levels, significantly affect cognitive functions and neuroplasticity, shaping the responses of men and women to nutritional and physical exercise interventions.
• Cardiovascular and Metabolic Systems: Aerobic exercise enhances the expression of neuroplasticity biomarkers including BDNF, insulin-like growth factor 1 (IGF-1), and vascular endothelial growth factor (VEGF).

4. Contributing and Associated Factors

4.1 Age and Developmental Stage

Cognitive performance gradually declines with age, probably as a result of cellular and metabolic changes that lead to a progressive reduction in synaptic plasticity in brain regions crucial for cognitive functions. Aging is related to a significant shrinkage of gray matter, an important reduction in the number of synapses, and changes in neuroplasticity-related proteins.

Brain aging is characterized by shifts in the functional properties and dynamics of neurons that may have maladaptive consequences. The brain typically encounters neuronal dysfunctions such as neurodegeneration, decreased neuroplasticity, and accumulated impacts of oxidative stress as it ages, which coincide with disruptive inter-neuronal dynamics within the connectome. These changes closely contribute to declines in cognitive abilities, impaired mobility, and unfavorable mood alterations.

4.2 Neurotrophic Factor Status (BDNF)

Brain-derived neurotrophic factor (BDNF) is a member of the neurotrophin family of growth factors involved in plasticity of neurons, with key roles in the regulation of stress, mood, cognition, metabolism, and sleep.

Changes in BDNF expression are associated with both normal and pathological aging and also psychiatric disease, particularly in structures important for memory processes such as the hippocampus and parahippocampal areas.

Convergent evidence indicates that neuroplastic mechanisms involving BDNF are deleteriously altered in major depressive disorder (MDD) and animal models of stress. Clinical and preclinical evidence provides that stress-induced depressive pathology contributes to altered BDNF level and function in persons with MDD, causing disruptions in neuroplasticity at the regional and circuit level.

4.3 Stress and Psychological Factors

In animal models, stress reduces the long 3′ UTR Bdnf mRNA levels in the prefrontal cortex of adult rats and in the hippocampus of adolescent rats. Chronic psychological stress is thus considered a key modifiable factor negatively influencing neuroplastic capacity.

4.4 Neurodegeneration and Disease

Common mechanisms associated with age-related neurodegenerative processes — including protein aggregation and accumulation, mitochondrial dysfunction, oxidative stress, and neuroinflammation — can be mitigated, at least partially, by non-invasive and non-pharmacologic lifestyle interventions aimed at promoting and harnessing neuroplasticity.

Reduced circulating levels of BDNF have been found in mild cognitive impairment (MCI). BDNF levels are correlated to disease severity and episodic memory performance, suggesting these decreases could be related to the pathogenesis of Alzheimer's disease. Downregulation of BDNF and proBDNF is thought to be an underlying mechanism related to early Alzheimer's disease.

4.5 Dietary Quality

Lifestyle is one of the most powerful instruments shaping brain performance; it includes aspects of interactions with the environment, from nourishment and education to physical activity and quality of sleep. All these factors in combination affect neuroplasticity and define brain performance and cognitive longevity.

Spatial learning and BDNF levels in the hippocampus were reduced in rats following two months on a high saturated fat and refined sugar diet, findings interpreted as impairments in synaptic plasticity and motor learning. Chronic consumption of a diet high in saturated fat is associated with an increased risk of cognitive decline and eventually dementia through mechanisms mediated by the development of insulin resistance and type II diabetes.

5. Nutrients Studied in Relation to Neuroplasticity

5.1 Omega-3 Polyunsaturated Fatty Acids (DHA and EPA)

Omega-3 fatty acids and physical exercise independently influence molecular pathways central to healthy aging, including neuroplasticity, oxidative stress, inflammation, and metabolism. ALA, DHA, and EPA support neuronal membrane integrity, modulate neurotransmitter systems, and attenuate pro-inflammatory cascades.

Traditional use: Oily fish and fish liver oils have been consumed for centuries across Northern European, Japanese, and indigenous Arctic coastal cultures. These traditional diets, rich in EPA and DHA, have been historically associated with cognitive vigor and overall wellbeing, though the link to neuroplasticity specifically was not conceptualized until modern science.

Scientific evidence: A reduction in BDNF caused by oxidative stress can be counteracted by omega-3 polyunsaturated fatty acids (PUFAs), thereby enhancing synaptogenesis, neurogenesis, and neuroplasticity.

Omega-3 fatty acids have attracted the attention of researchers because of their influence on circulatory levels of BDNF. A systematic review and meta-analysis of randomized controlled trials (RCTs) assessing omega-3 fatty acid supplementation on serum BDNF concentration included a total of 12 studies involving 587 subjects. Supplementation with PUFAs was found to be associated with a significant increase in serum levels of BDNF in the group receiving supplements compared to the placebo group (SMD: 0.72 pg/mL, 95% CI: 0.28–1.15; P < 0.001), though with high heterogeneity (I² = 84.39%, P < 0.001).

A double-blind, placebo-controlled clinical trial investigated the effect of omega-3 supplementation on BDNF and depression in 60 men with bipolar disorder, who received 2 g/day of omega-3 supplements or placebo for 2 months. Daily supplementation with 2 g of omega-3 fatty acids for 2 months decreased depression scores and increased serum concentrations of BDNF in bipolar disorder patients compared to the placebo group.

In rodent research, supplementation of omega-3 fatty acids such as DHA increased hippocampal BDNF levels, and this effect was increased when applied concurrently with exercise.

While some omega-3 studies — both dietary and supplementation — show positive benefits on cognition, particularly memory function, and supplementation studies show reduction in markers of inflammation including IL-6 and TNF-α, some studies show no clear benefits on cognition and inflammation, particularly in healthy populations. Most consistency in beneficial cognition outcomes has been in populations with MCI. Evidence strength is therefore rated as moderate for populations with cognitive impairment and mixed to preliminary for healthy adults.

5.2 B Vitamins (B6, Folate/B9, B12)

The B-vitamin group provides a dense network of cofactors that support neuronal integrity and synaptic function.

Vitamins B6, B9 (folate), and B12 are essential for homocysteine metabolism and for methylation reactions required for DNA synthesis, myelin maintenance, and the production of neurotransmitters such as serotonin, dopamine, and noradrenaline.

Chronic elevations of homocysteine, often arising from insufficient intake of these vitamins or from genetic variants in folate-related pathways, have been robustly linked to accelerated brain atrophy, cognitive decline, depression, and increased risk of neurodegenerative disease.

Low maternal folate levels, as well as imbalance between folate and vitamin B12, have been directly associated with reduced levels of both BDNF and NGF. Low neurotrophin levels are further suggested to increase the risk of preeclampsia in the mother, a condition that in turn has been shown to elevate the risk of neurodevelopmental disorders in the offspring, such as ADHD and lower cognitive ability.

Several studies have identified a crucial role for vitamins D and B12 in brain development, and deficiency in these vitamins may contribute to the emergence of cognitive deficits. Disruption or delay to the formation of perineuronal nets (PNNs) results in the resumption or extension of the time window for neuroplasticity in the brain, wherein the nervous system is more sensitive to epigenetic, physical, biochemical, environmental, and nutritional factors.

Evidence strength: The role of B vitamins in homocysteine metabolism and neural maintenance is well-established biochemically and epidemiologically. Direct intervention evidence for neuroplasticity enhancement in cognitively intact adults is more limited; the clearest evidence relates to deficiency correction.

5.3 Magnesium

In the nervous system, magnesium is important for neuromuscular coordination and optimal nerve transmission. It is also useful to protect against excessive excitation leading to cell death: it interacts with the NMDA (aspartate) receptor by blocking the calcium channel, a mechanism directly relevant to synaptic plasticity regulation.

Mechanistic evidence links magnesium to neuroplasticity, synaptic integrity, energy metabolism, oxidative balance, and neuroinflammation. Preclinical data suggest that magnesium-L-threonate, which crosses the blood-brain barrier more readily than other forms, can raise brain magnesium concentrations and improve spatial and associative memory in rodents. Human clinical evidence at this level of neuroplasticity specificity remains preliminary.

5.4 Zinc

Nuts and shellfish contain zinc, which along with other micronutrients is crucial for neurogenesis, neurotransmitter synthesis, and neuroplasticity, in turn directly impacting cognitive functioning and the ability to resist disorders. Zinc is concentrated in hippocampal mossy fiber terminals and plays a modulatory role in LTP. Observational studies associate low zinc status with impaired memory and mood, though high-quality human trials specifically targeting neuroplastic endpoints remain limited.

5.5 Choline and Phosphatidylcholine

Choline is identified as a key micronutrient supporting neuroplasticity, synaptic integrity, and neuroinflammation modulation. Choline is the precursor to acetylcholine, the principal neurotransmitter of the cholinergic system, which is central to learning and memory. It is also a component of phosphatidylcholine, a structural constituent of neuronal membranes. Evidence for choline supplementation specifically enhancing neuroplastic processes in healthy adults is largely mechanistic or based on deficiency contexts; human interventional evidence remains moderate.

6. Herbs and Natural Ingredients Studied in Relation to Neuroplasticity

6.1 Curcumin (Curcuma longa)

Traditional use: Curcumin is the principal polyphenol of turmeric (Curcuma longa), used in Ayurvedic and Traditional Chinese Medicine for millennia, typically as a dietary spice and in preparations for inflammation, wound healing, and cognitive complaints. Preparations ranged from decoctions to spiced food and medicinal pastes.

Scientific evidence: In D-galactose-induced aged mice, curcumin promoted hippocampal neurogenesis and increased BDNF levels, leading to improved cognitive function. In behavioral assays including the object recognition test and Y-maze, administration of curcumin at doses ranging from 50–100 mg/kg enhanced recognition memory, accompanied by modest anti-inflammatory effects.

In mouse models, curcumin administration rescued impaired cognition, shown as enhanced neurogenesis and dendritic spine density in the hippocampus. At the molecular level, curcumin was found to promote the expression of BDNF and postsynaptic density protein 95 (PSD95). Primary hippocampal neuron studies showed curcumin could promote dendritic growth, normalizing ambient neuroplasticity and preserving neurogenesis.

Curcumin supplementation before and after induced traumatic brain injuries led to increased BDNF and cAMP response element binding proteins — both markers of synaptic plasticity and facilitation of hippocampal neurogenesis in rats. Curcumin has also been found to modulate chronic inflammation via lowering TNF-alpha concentration levels, which aids neurotransmission and neurogenesis.

Systematic reviews and meta-analyses of RCTs have evaluated the efficacy of curcumin supplementation on circulating levels of IL-6 and TNF-α and reported a significant effect of curcumin in lowering both inflammatory markers. The ability of curcumin to mitigate chronic inflammatory processes is important because chronic inflammation dysregulates neurotransmission and trophic factor signaling, and disrupts the processes of neurogenesis and neuroplasticity.

A growing body of in vitro and in vivo evidence shows a possible role of polyphenols, including curcumin, in counteracting neurodegeneration. However, the majority of neuroplasticity-specific evidence for curcumin in humans remains indirect (via inflammatory biomarker reduction). Curcumin's poor oral bioavailability is a recognized limitation; much of the preclinical work has used formulations or doses not easily replicated with standard dietary supplementation. Evidence strength: animal/in-vitro strong; human RCT evidence for neuroplasticity-specific outcomes: preliminary to moderate.

6.2 Lion's Mane Mushroom (Hericium erinaceus)

Traditional use: Hericium erinaceus (Lion's Mane) has been used in Traditional Chinese Medicine and Japanese Kampo medicine for centuries, consumed as a food and medicinal mushroom, associated with supporting the stomach, nerves, and overall vitality. It was used to prepare decoctions and teas.

Scientific evidence: Preclinical studies have demonstrated that bioactive compounds in Lion's Mane, such as hericenones and erinacines, can promote nerve growth factor (NGF) synthesis and potentially support neuroplasticity.

One of the most significant clinical trials investigated the effects of H. erinaceus supplementation on cognitive function in 50- to 80-year-old Japanese men and women with mild cognitive impairment (MCI). In a randomized, double-blind, placebo-controlled study, subjects who consumed H. erinaceus extract for 16 weeks showed significant improvements in cognitive performance compared to the placebo group. Notably, these benefits declined after discontinuation of supplementation, suggesting a need for sustained intake to maintain cognitive enhancements.

Clinical trials testing Lion's Mane interventions have included small numbers of participants with short durations of treatment. Well-designed larger and longer clinical trials are needed. Cognitive effects with Lion's Mane supplements have been mixed based on several small clinical trials.

Evidence strength: NGF-stimulating properties are well-documented in preclinical work; human clinical evidence is promising but limited by small sample sizes and short study durations. Overall rated preliminary to moderate.

6.3 Bacopa monnieri (Brahmi)

Traditional use: Bacopa monnieri (also called Brahmi or Waterhyssop) has been used in Ayurvedic medicine for over 3,000 years as a medhya rasayana — a category of herbs considered to promote intellectual capacity and memory. It was traditionally prepared as a ghee-based decoction, powder, or fresh juice, typically for children during learning periods and for elderly individuals with memory complaints.

Scientific evidence: Bacopa monnieri is a herbal supplement that increases signaling molecules implicated in synaptogenesis. Combined with cognitive stimulation, it may be a viable supplement to enhance long-term potentiation (LTP) and improve cognitive health in older adults.

Bacopa monnieri's mechanism of action in brain diseases may be related to its ability to modulate neurotransmission, neurogenesis, neuronal plasticity, intracellular signaling, epigenetics, cerebral blood flow, energy metabolism, protein folding, endoplasmic reticulum stress, and the neuroendocrine system.

Bacopa monnieri can modulate the microRNA 124-CREB pathway to improve synaptic plasticity, improving cognition and memory.

Human studies have observed Bacopa monnieri-related cognitive improvements, including improved immediate and delayed memory recall, processing speed, and sustained attention. These effects were observed after similar periods of time including 12 weeks and 90 days, suggesting BM-specific improvements to cognitive outcomes might be observed after a relatively short period of supplementation.

A randomized, double-blind, placebo-controlled trial examined 28 healthy adults aged over 55 years undertaking cognitive training for 12 weeks; 15 consumed a standardized extract of Bacopa monnieri and 13 consumed placebo daily. Cognitive tasks, life-satisfaction, memory complaints, mood, and serum BDNF were assessed before and after 12 weeks. Exploratory neuroimaging analysis showed increased white matter mean diffusivity and gray matter dispersion of neurites in the Bacopa group, though no other outcomes reached statistical significance.

Evidence strength: multiple small-to-moderate RCTs in older adults support improvements in memory recall and processing speed; neuroplasticity biomarkers (BDNF, neuroimaging) are emerging but not yet consistently replicated. Overall rated moderate for cognitive outcomes, preliminary for specific neuroplasticity endpoints.

6.4 Resveratrol

Traditional use: Resveratrol is a stilbenoid polyphenol found in grapes, red wine, and certain berries. Its use is not historically delineated as a specific isolated compound; rather, red wine and grape-based preparations have featured in Mediterranean, Greek, and various traditional cultures for their perceived health-promoting properties.

Scientific evidence: Researchers investigated the effects of resveratrol treatment on hippocampal plasticity and memory performance in female Balb/C mice — a strain with low baseline levels of adult neurogenesis. Two weeks of treatment with resveratrol (40 mg/kg) induced the production of new neurons in vivo by increasing cell survival and possibly precursor cell proliferation. Resveratrol also decreased the number of apoptotic cells.

A growing body of in vitro and in vivo evidence shows a possible role of polyphenols such as resveratrol in counteracting neurodegeneration. Human evidence for resveratrol's direct enhancement of neuroplasticity remains limited; most research has been conducted in animal models or cell cultures. Some human trials have reported modest cognitive or cerebrovascular benefits in older adults, but robust neuroplasticity-specific RCT data are lacking. Evidence strength: animal/in-vitro: moderate; human RCT evidence for neuroplasticity outcomes: preliminary.

6.5 Polyphenols and Flavonoids (General)

Research has shown that the domains of long-term memory, processing speed, and mood showed sensitivity to flavonoid intervention.

Preliminary evidence from in vitro studies and animal models indicates that neurophytochemicals could enhance synaptic plasticity, protect neurons from oxidative damage, and modulate inflammatory pathways, particularly those involving NF-κB and the Nrf2/ARE antioxidant response.

Compounds such as apigenin, hesperidin, and epigallocatechin gallate (EGCG) have been shown to have a significant impact on key regulatory pathways, including enhancing neurogenesis via BDNF, modulating neurotransmitter systems such as GABA and serotonin, and attenuating oxidative stress and neuroinflammation. The human evidence base is promising but the field is at an early stage in terms of high-quality clinical trials specifically designed to measure neuroplastic endpoints.

6.6 Withania somnifera (Ashwagandha)

Traditional use: Ashwagandha (Withania somnifera) is one of the most prominent herbs in Ayurvedic medicine, classified as a rasayana (rejuvenating tonic). It has been used for over 2,500 years in the form of root powder mixed with milk or ghee to promote physical and mental endurance, reduce stress, and enhance memory and intellect.

Scientific evidence: Withanolides from Withania somnifera are among neuroactive phytochemicals reviewed for multi-target modulation of mental health and cognitive function. These compounds exert neuroprotective effects by inhibiting Aβ aggregation, reducing tau phosphorylation, scavenging reactive oxygen species, attenuating NF-κB-mediated inflammation, modulating cholinergic signaling, and enhancing synaptic plasticity via BDNF.

Withania somnifera and Bacopa monnieri are traditionally used for the temporary relief of symptoms of stress, which chronically can cause memory deficits. Studies have evaluated whether choline activity can be enhanced by the association with WS and BM extracts as adaptogens. Several small RCTs have reported improvements in memory and cognitive performance in adults under stress. Evidence specifically targeted at neuroplastic biomarkers in humans is still limited. Evidence strength: preliminary to moderate in humans.

7. Dietary Patterns and Their Relationship to Neuroplasticity

7.1 Mediterranean Diet

The Mediterranean diet — high in vegetables, fruits, legumes, nuts, grains, fish, and unsaturated fats but low in meat and dairy — claims to support brain function among several other benefits.

An individual's dietary choices clearly affect neuroplastic processes in the brain. Adherence to certain dietary interventions such as the Mediterranean diet, ketogenic diet, caloric restriction, intermittent fasting, and diet supplementation appear to increase measures of neuroplasticity.

Research has shown that those with higher adherence to a healthy dietary pattern had a reduced risk of dementia (HR: 0.77; 95% CI: 0.61–0.98) among APOE ε4 non-carriers, while those with higher adherence to a Western dietary pattern had an increased risk of dementia among ε4 carriers (HR: 1.37; 95% CI: 1.05–1.78). These results suggest an interplay between dietary patterns and APOE ε4 status in relation to incident dementia.

7.2 Ketogenic Diet

Research has reviewed the effects on learning and memory processes of diets with high fat content (such as the ketogenic diet), focusing especially on nutrient composition, exposure time, and differences between sexes and age groups, documenting evidence on the association between dietary composition and nutrient-mediated modulation of neuroplasticity through hippocampal synaptic AMPA receptors. The evidence base for the ketogenic diet's effect on neuroplasticity specifically remains largely preclinical and in populations with neurological conditions such as epilepsy; robust evidence in otherwise healthy adults is still developing.

7.3 Western Diet and Dietary Patterns Harmful to Neuroplasticity

Prolonged consumption of a high-fat diet exacerbates depressive-like behaviors in male adult rats and decreases synaptic markers within the hippocampus, suggesting that chronic intake has detrimental effects on neural plasticity and behavioral function. Notably, BDNF levels oscillate during the consumption of a high-fat diet; initially levels increase, but they progressively fall below baseline levels after long-term consumption.

A maternal high-fat diet may have multigenerational negative effects on synaptic plasticity through epigenetic mechanisms that inhibit BDNF expression in the hippocampus of the progeny. Epigenetic modifications related to gene activation were found to be decreased in the germline and hippocampus of male descendants of mothers consuming this diet.

7.4 Glucose Metabolism and Cognitive Energy

Cognitive impairment occurs when brain cells are starved for energy. Glucose, the primary energy source of brain cells, relies on insulin to reach the brain cells. Chronic insulin resistance arising from diet-related metabolic dysfunction is therefore a relevant pathway through which diet adversely affects neuroplastic capacity.

8. Lifestyle Factors

8.1 Physical Exercise

MRI studies in humans showed that adults who practiced moderate-intensity exercise for 12 weeks had significant increases in the volume of several brain regions, especially the hippocampus. These findings suggest that physical activity improves cognitive functions by inducing structural changes in different brain regions. Exercise mediates its positive effects on the brain by activating several distinct pathways including neurotrophic and angiogenic pathways.

Exercise enhances BDNF expression, mTOR signaling, hippocampal neurogenesis, and cerebral blood flow.

Combining aerobic and strength training with a nutritional supplement led to greater improvements in working memory and reaction time compared to aerobic and strength training alone, with evidence suggesting that exercise-induced neuroplasticity may be facilitated by modifications in diet.

8.2 Sleep

BDNF is a member of the neurotrophin family of growth factors involved in plasticity of neurons with key roles in the regulation of stress, mood, cognition, metabolism, and sleep. BDNF is important for sleep physiology.

Voluntary aerobic exercise in animal models prevented sleep-deprivation-related impairments in early-phase LTP in the hippocampus along with reductions in behavioral assessments of learning and memory. These findings support the existence of a complex interaction between exercise and sleep mediated by several neurophysiological mechanisms not yet fully understood. Further investigation is required to comprehensively understand the protective effects of exercise on the negative health consequences of sleep deprivation, as well as the ideal combination of sleep and exercise to prime neuroplasticity.

8.3 Cognitive Engagement

Despite growing interest in pharmacological cognitive enhancement, convincing evidence of clinically meaningful improvement in cognitive functions in healthy individuals is lacking; the strongest effects on neuroplasticity continue to be demonstrated by non-pharmacological interventions. Learning new skills, formal cognitive training, bilingualism, musical training, and similar activities represent non-pharmacological stimulants of neuroplastic adaptation that are consistently supported in the literature.

8.4 Stress Reduction

The neurotrophic hypothesis of depression proposes that stress-related alterations in BDNF levels occur in key limbic structures to contribute to the pathogenic processes in major depressive disorder. BDNF is vital to the survival, growth, and maintenance of neurons in key brain circuits involved in emotional and cognitive function. Chronic stress represents a significant suppressor of neuroplastic potential, and evidence supports a role for stress-reduction practices — including mindfulness, adequate social support, and nature exposure — in maintaining BDNF tone and neuroplastic capacity, though human interventional evidence for most of these practices at the neuroplasticity-biomarker level remains emerging.

8.5 Combined Lifestyle Approaches

It is well understood that good nutrition, regular exercise, and sufficient sleep are fundamental to maintaining a healthy lifestyle. A cross-sectional study revealed that sleep quality, adequate fruit and vegetable intake, and regular physical activity improve depressive symptoms and wellbeing in young adults. However, the role of exercise, diet, sleep, and their combined influence on neuroplasticity is not yet fully understood.

Combined interventions involving omega-3 and exercise may produce additive or synergistic effects via shared pathways such as BDNF/TrkB, PI3K/Akt, AMPK/SIRT1, and PPAR-γ. Reported benefits include improved antioxidant defenses, reduced oxidative damage, and moderated neuroinflammation.

9. Evidence Quality Summary

The field of nutritional neuroplasticity is active but uneven in evidence quality. The following general characterizations apply based on the sourced literature:

• Strongest human evidence: Aerobic exercise increasing BDNF and hippocampal volume; Mediterranean diet patterns associated with reduced dementia risk; omega-3 supplementation raising serum BDNF in clinical populations.
• Moderate human evidence: Bacopa monnieri improving memory outcomes in older adults; omega-3 supplementation improving cognitive outcomes in MCI; B-vitamin deficiency correction restoring neuroplastic capacity.
• Preliminary human evidence / strong preclinical: Curcumin increasing BDNF and reducing neuroinflammatory markers; Lion's Mane stimulating NGF in small trials; resveratrol and flavonoids enhancing neurogenesis in animal models.
• Largely animal/in-vitro: Specific mechanisms of most phytochemicals on synaptic plasticity endpoints; magnesium-L-threonate's effects on brain magnesium and cognition; many dietary pattern effects on BDNF.

Although the evidence of dietary interventions is promising, it is important to note that many of these studies have been done in animal models, and future steps require more widespread evaluations in human populations.

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