Neurobiology of Mood and Nutrition
Expert-defined terms from the Postgraduate Certificate in Nutritional Psychiatry course at HealthCareCourses (An LSIB brand). Free to read, free to share, paired with a professional course.
Acetylcholine – neurotransmitter that modulates attention, learning and m… #
Related terms: cholinergic system, muscarinic receptors, nicotinic receptors. It is synthesized from choline and acetyl‑CoA; dietary choline sources (eggs, soy) influence its levels. Practical application: enhancing choline intake may support cognitive aspects of depression. Challenge: excess acetylcholine can provoke anxiety, and individual variability in cholinergic metabolism complicates dosing.
Acute Stress Response – rapid activation of the hypothalamic‑pituitary‑ad… #
Related terms: cortisol surge, sympathetic nervous system, fight‑or‑flight. Short‑term stress can increase glucose availability, but repeated acute episodes may dysregulate mood circuits. Example: a single exam stressor elevates cortisol, temporarily boosting alertness. Application: timing nutrient intake (e.g., complex carbs) to buffer cortisol spikes. Challenge: distinguishing beneficial acute stress from harmful chronic activation.
Adiponectin – adipokine with anti‑inflammatory and insulin‑sensitizing pr… #
Related terms: adipose tissue, leptin, metabolic syndrome. Higher adiponectin levels correlate with reduced depressive symptoms. Example: omega‑3‑rich diets raise adiponectin. Practical use: measuring adiponectin as a biomarker for mood‑metabolic health. Challenge: genetic polymorphisms affect adiponectin response to diet.
Amygdala – brain region central to processing fear and emotional salience #
Related terms: limbic system, threat detection, affective circuitry. Nutrients that modulate glutamate (e.g., magnesium) can influence amygdala excitability. Example: low‑magnesium diets increase amygdala reactivity to negative stimuli. Application: magnesium supplementation as adjunct for anxiety. Challenge: blood‑brain barrier transport limits rapid changes.
Anaerobic Glycolysis – metabolic pathway generating ATP without oxygen #
Related terms: lactate, glycolytic flux, mitochondrial dysfunction. Elevated lactate in the brain is linked to mood disorders. Example: intense exercise raises lactate, which may act as a signaling molecule for neuroplasticity. Practical use: timing high‑intensity workouts to harness lactate‑mediated benefits. Challenge: excessive lactate can exacerbate fatigue and depressive rumination.
Anti‑Inflammatory Diet – dietary pattern rich in omega‑3 fatty acids, pol… #
Related terms: Mediterranean diet, DASH diet, dietary inflammatory index. Evidence shows reduced systemic inflammation and improved mood scores. Example: daily consumption of fatty fish, berries, and leafy greens. Application: prescribing diet plans as part of treatment for major depressive disorder. Challenge: adherence barriers and cultural food preferences.
Apoptosis – programmed cell death essential for neural development #
Related terms: caspases, neurotrophins, oxidative stress. Dysregulated apoptosis contributes to neurodegeneration in mood disorders. Example: excess ROS from a high‑sugar diet can trigger neuronal apoptosis. Practical approach: antioxidant supplementation (vitamin C, flavonoids) to protect neurons. Challenge: balancing apoptosis inhibition without promoting oncogenic risk.
Astrocyte – glial cell that regulates neurotransmitter recycling and ener… #
Related terms: glutamate–glutamine cycle, blood‑brain barrier, lactate shuttle. Astrocytic dysfunction impairs synaptic plasticity. Example: reduced astrocytic glutamate uptake in chronic stress leads to excitotoxicity. Application: targeting astrocyte metabolism with ketogenic diets to improve mood stability. Challenge: limited non‑invasive methods to assess astrocyte function in patients.
Beta‑Oxidation – mitochondrial breakdown of fatty acids for energy #
Related terms: fatty acid metabolism, ketogenesis, carnitine shuttle. Efficient beta‑oxidation supports brain energy during low‑glucose states. Example: fasting or low‑carb diets increase reliance on beta‑oxidation, often improving depressive symptoms. Application: guided intermittent fasting protocols. Challenge: risk of hypoglycemia in vulnerable populations.
Brain‑Derived Neurotrophic Factor (BDNF) – protein that promotes neuronal… #
Related terms: TrkB receptor, neurogenesis, mood‑enhancing pathways. Exercise and omega‑3 intake up‑regulate BDNF. Example: 30 min of moderate aerobic activity raises serum BDNF within weeks. Practical implication: combining physical activity with diet to boost BDNF for antidepressant effect. Challenge: BDNF levels are influenced by genetics (Val66Met) and stress, complicating uniform recommendations.
Blood‑Brain Barrier (BBB) – selective barrier protecting the CNS from per… #
Related terms: endothelial tight junctions, transporters, neuroinflammation. Nutrients cross the BBB via specific transporters (e.g., LAT1 for large neutral amino acids). Example: tryptophan competes with other amino acids for BBB entry, affecting serotonin synthesis. Application: dietary manipulation of amino acid ratios to influence mood. Challenge: systemic inflammation can increase BBB permeability, altering drug and nutrient effects.
Calcium Signaling – intracellular cascade influencing neurotransmitter re… #
Related terms: voltage‑gated calcium channels, NMDA receptors, intracellular calcium stores. Dysregulated calcium signaling is implicated in bipolar disorder. Example: lithium stabilizes intracellular calcium fluxes. Practical use: ensuring adequate dietary calcium (dairy, fortified plant milks) while monitoring for hypercalcemia. Challenge: calcium excess can precipitate depressive symptoms in susceptible individuals.
Carbohydrate‑Insulin Model – hypothesis linking high‑glycemic carbs to in… #
Related terms: glycemic index, insulin resistance, satiety hormones. High post‑prandial insulin may reduce tryptophan transport into the brain, lowering serotonin. Example: sugary breakfast correlates with mid‑day irritability. Application: recommending low‑glycemic meals to stabilize mood. Challenge: individual insulin sensitivity varies widely.
Carnitine – molecule that transports long‑chain fatty acids into mitochon… #
Related terms: primary carnitine deficiency, acetyl‑L‑carnitine, energy metabolism. Supplementation can improve depressive symptoms in patients with mitochondrial dysfunction. Example: 2 g/day of acetyl‑L‑carnitine improves mood in elderly cohorts. Practical use: testing plasma carnitine levels in treatment‑resistant depression. Challenge: high doses may cause gastrointestinal upset.
Catecholamines – neurotransmitters dopamine, norepinephrine, and epinephr… #
Related terms: catechol‑O‑methyltransferase (COMT), monoamine oxidase (MAO), stress response. Diets high in tyrosine (e.g., cheese, soy) can boost catecholamine synthesis. Example: tyrosine supplementation reduces fatigue under acute stress. Application: using tyrosine‑rich foods as adjunct in attention‑deficit treatments. Challenge: excessive catecholamine activity may provoke anxiety or insomnia.
Cholecystokinin (CCK) – peptide hormone involved in satiety and anxiety m… #
Related terms: vagal afferents, pancreatic enzymes, CCK‑B receptors. High‑fat meals stimulate CCK release, which can induce anxiety in sensitive individuals. Example: a heavy cheese platter may increase CCK‑mediated panic in predisposed patients. Practical implication: moderating dietary fat to manage anxiety spikes. Challenge: individual variability in CCK receptor sensitivity.
Cortisol – glucocorticoid hormone released during stress; influences gluc… #
Related terms: HPA axis, diurnal rhythm, glucocorticoid receptors. Chronic elevation depresses hippocampal neurogenesis. Example: night‑shift workers often exhibit flattened cortisol curves and depressive symptoms. Application: timing meals (e.g., protein at breakfast) to blunt cortisol spikes. Challenge: cortisol feedback loops are highly individualized, making universal dietary guidelines difficult.
Creatine – compound that buffers cellular ATP via the phosphocreatine sys… #
Related terms: phosphocreatine, brain energetics, neuroprotection. Supplementation can improve depressive symptoms, particularly in females. Example: 5 g/day of creatine monohydrate enhanced mood in a 12‑week trial. Practical use: adding creatine to diet for patients with low energy fatigue. Challenge: renal considerations and potential weight gain may limit use.
Cytochrome P450 Enzymes – liver enzymes that metabolize drugs and nutrien… #
Related terms: CYP1A2, CYP2D6, drug‑nutrient interactions. Certain foods (e.g., grapefruit) inhibit CYP3A4, affecting antidepressant levels. Example: grapefruit juice can raise sertraline plasma concentrations. Application: counseling patients on food–drug interactions in psychiatric care. Challenge: polymorphic expression of CYP genes leads to unpredictable interactions.
DNA Methylation – epigenetic modification that can silence gene expressio… #
Related terms: epigenetics, histone acetylation, nutrigenomics. Folate and B12 provide methyl groups influencing methylation patterns linked to mood. Example: low folate status associates with hypermethylation of BDNF promoter, reducing expression. Practical use: measuring methylation biomarkers to tailor supplementation. Challenge: reversibility of methylation changes is limited; long‑term dietary patterns are needed.
Dopamine – catecholamine neurotransmitter governing reward, motivation, a… #
Related terms: mesolimbic pathway, D2 receptors, Parkinson’s disease. Tyrosine‑rich foods (e.g., turkey, nuts) support dopamine synthesis. Example: a diet high in fermented soy boosts dopamine turnover in animal models. Application: dietary strategies to alleviate anhedonia. Challenge: excessive dopamine can precipitate psychosis; balance is critical.
Electron Transport Chain (ETC) – series of mitochondrial complexes genera… #
Related terms: Complex I‑IV, reactive oxygen species (ROS), mitochondrial DNA. Nutrients such as coenzyme Q10 and B‑vitamins support ETC efficiency. Example: CoQ10 supplementation improves mitochondrial respiration in depressive patients. Practical implication: assessing ETC function via lactate/pyruvate ratios. Challenge: ETC deficits are often multifactorial, requiring combined interventions.
Endocannabinoid System – lipid signaling system modulating stress, appeti… #
Related terms: anandamide, CB1 receptors, FAAH enzyme. Dietary omega‑3 fatty acids increase endocannabinoid tone. Example: fish‑oil supplementation elevates anandamide, reducing anxiety. Application: incorporating omega‑3‑rich foods for mood regulation. Challenge: endocannabinoid levels are also affected by exercise, making isolated dietary effects hard to quantify.
Enteric Nervous System (ENS) – network of neurons governing gastrointesti… #
” Related terms: gut‑brain axis, vagus nerve, serotonin (5‑HT). Over 90 % of body serotonin is produced in the gut. Example: probiotic strains (Lactobacillus rhamnosus) modulate ENS signaling and reduce depressive behaviors in rodents. Practical use: recommending specific probiotic formulations for mood support. Challenge: strain‑specific effects and individual microbiome composition create variability.
Epigenetic Nutrition – dietary influence on gene expression through epige… #
Related terms: methyl donors, histone modification, nutrigenomics. Folate, choline, and betaine serve as methyl donors; polyphenols can inhibit DNA methyltransferases. Example: maternal intake of leafy greens can epigenetically program offspring stress resilience. Application: designing prenatal nutrition plans to reduce future mood disorder risk. Challenge: long latency between dietary exposure and measurable epigenetic outcomes.
Erythropoietin (EPO) – hormone primarily involved in red blood cell produ… #
Related terms: hypoxia‑inducible factor (HIF), neurogenesis, oxidative stress. Exercise‑induced hypoxia raises endogenous EPO, supporting mood. Example: high‑altitude training increases brain EPO, correlating with improved depressive scores. Practical implication: using moderate hypoxic training as adjunct therapy. Challenge: excessive EPO may increase thrombosis risk.
Fatty Acid Oxidation Disorders – inherited conditions impairing beta‑oxid… #
Related terms: medium‑chain acyl‑CoA dehydrogenase deficiency, carnitine deficiency, metabolic crisis. Even heterozygous carriers may experience mood fluctuations under dietary stress. Example: low‑carb diets can precipitate crisis in undiagnosed individuals. Application: screening for fatty‑acid oxidation markers before recommending ketogenic diets. Challenge: rare disorders require specialist referral.
Folate (Vitamin B9) – water‑soluble vitamin essential for one‑carbon meta… #
Related terms: methyl folate, homocysteine, folic acid fortification. Low folate correlates with higher depression prevalence. Example: 400 µg/day of folic acid reduces depressive symptom severity in clinical trials. Practical use: routine folate testing in mood disorder assessments. Challenge: folic acid can mask B12 deficiency; personalized dosing needed.
Glial Cell Line‑Derived Neurotrophic Factor (GDNF) – protein supporting d… #
Related terms: RET receptor, Parkinson’s disease, neuroprotection. Certain flavonoids (e.g., quercetin) up‑regulate GDNF expression. Example: quercetin‑rich onions increase GDNF in rodent striatum. Application: incorporating flavonoid‑dense foods for dopaminergic health. Challenge: bioavailability of flavonoids varies with gut microbiota.
Glutamate – principal excitatory neurotransmitter; excess can cause excit… #
Related terms: NMDA receptor, astrocytic uptake, glutamine cycle. Magnesium and zinc act as NMDA antagonists, reducing glutamate overactivity. Example: magnesium‑deficient diets heighten amygdala glutamate response. Practical use: magnesium supplementation to mitigate hyper‑glutamatergic states in anxiety. Challenge: balancing inhibition to avoid cognitive dulling.
Glutathione – major intracellular antioxidant protecting neurons from oxi… #
Related terms: GSH/GSSG ratio, N‑acetylcysteine (NAC), redox homeostasis. NAC supplementation boosts glutathione, showing antidepressant effects. Example: 1200 mg/day NAC improved mood in a double‑blind trial. Application: using NAC as adjunct in treatment‑resistant depression. Challenge: high doses may interfere with certain chemotherapy agents.
Hippocampus – brain structure critical for memory consolidation and stres… #
Related terms: neurogenesis, glucocorticoid receptors, atrophy. Chronic stress reduces hippocampal volume; aerobic exercise and omega‑3s can reverse atrophy. Example: 12‑week treadmill program increased hippocampal gray matter in older adults. Practical implication: prescribing exercise as part of mood disorder management. Challenge: adherence to exercise regimes is often low.
Homeostatic Plasticity – neuronal mechanisms that stabilize firing rates… #
Related terms: synaptic scaling, intrinsic excitability, activity‑dependent regulation. Diets high in refined sugars can disrupt homeostatic plasticity, leading to hyperexcitability. Example: sugar‑laden diets in mice cause persistent cortical hyperactivity. Application: recommending low‑sugar nutrition to preserve neuronal stability. Challenge: measuring homeostatic plasticity in humans remains indirect.
Hormesis – adaptive response where low‑dose stressors (e #
g., phytochemicals) confer health benefits. Related terms: mitohormesis, oxidative preconditioning, dietary polyphenols. Resveratrol induces mild mitochondrial stress, up‑regulating antioxidant defenses. Example: moderate red‑wine polyphenol intake improves mood via hormetic pathways. Practical use: integrating hormetic foods (berries, dark chocolate) into diet plans. Challenge: dose‑response curves are narrow; excessive intake may be counterproductive.
Insulin Sensitivity – efficiency of cells to respond to insulin #
Related terms: HOMA‑IR, metabolic syndrome, glucose tolerance. Improved insulin sensitivity via low‑glycemic meals correlates with reduced depressive symptoms. Example: 16‑week low‑carb diet lowered HOMA‑IR and improved mood scores. Application: monitoring insulin metrics as part of psychiatric assessment. Challenge: genetic predisposition to insulin resistance limits diet‑only interventions.
Ketone Bodies – metabolites (β‑hydroxybutyrate, acetoacetate) produced du… #
Related terms: ketogenic diet, neuroprotective signaling, epigenetic regulation. β‑Hydroxybutyrate acts as a histone deacetylase inhibitor, enhancing BDNF expression. Example: exogenous ketone ester supplementation improves cognition in bipolar patients. Practical use: prescribing short‑term ketogenic protocols for mood stabilization. Challenge: adherence, potential dyslipidemia, and contraindications in pregnancy.
Lactate – product of anaerobic glycolysis; also serves as a signaling mol… #
Related terms: astrocyte‑neuron lactate shuttle, acid‑base balance, mood modulation. Elevated brain lactate is observed in major depression. Example: endurance training reduces resting lactate levels and improves mood. Application: using lactate measurements to gauge metabolic stress in psychiatric patients. Challenge: interpreting lactate without context of exercise or diet can be misleading.
Leptin – hormone from adipose tissue regulating satiety and energy balanc… #
Related terms: leptin resistance, hypothalamic pathways, mood regulation. High leptin levels in obesity can impair reward circuitry, contributing to depressive symptoms. Example: weight‑loss interventions lower leptin and improve affect. Practical use: incorporating leptin‑sensitive foods (high protein, fiber) to support mood. Challenge: leptin resistance is hard to reverse solely with diet.
Long‑Chain Polyunsaturated Fatty Acids (LC #
PUFAs) – essential fatty acids, notably EPA and DHA. Related terms: omega‑3, membrane fluidity, anti‑inflammatory eicosanoids. Clinical trials show EPA ≥ 1 g/day reduces depressive symptoms. Example: daily fish oil capsule improves mood in postpartum depression. Application: recommending LC‑PUFA supplementation as adjunct therapy. Challenge: oxidation of fish oil requires proper storage; vegetarian sources (algae) may be less bioavailable.
Microbiome‑Gut‑Brain Axis – bidirectional communication network linking i… #
Related terms: dysbiosis, short‑chain fatty acids (SCFAs), vagus nerve. Certain strains produce GABA, serotonin precursors, and SCFAs that influence mood. Example: kefir consumption increases GABA‑producing Lactobacillus and reduces anxiety scores. Practical use: prescribing specific probiotic formulations based on symptom profile. Challenge: inter‑individual microbiome diversity limits one‑size‑fits‑all recommendations.
Mitochondrial DNA (mtDNA) – genetic material within mitochondria governin… #
Related terms: heteroplasmy, oxidative stress, maternal inheritance. mtDNA mutations are linked to treatment‑resistant depression. Example: carriers of the mtDNA 5178A allele respond better to exercise‑based interventions. Application: screening for mtDNA variants in refractory cases. Challenge: testing is costly and interpretation is still emerging.
Monoamine Oxidase (MAO) – enzyme degrading monoamines (serotonin, dopamin… #
Related terms: MAO‑A, MAO‑B, tyramine interaction. Certain foods (aged cheese, fermented soy) contain tyramine, which can precipitate hypertensive crisis when combined with MAO inhibitors. Example: dietary counseling prevents adverse events in patients on phenelzine. Practical implication: providing food lists for MAO‑inhibitor users. Challenge: patient adherence to dietary restrictions can be difficult.
Neuroinflammation – inflammatory processes within the CNS affecting neuro… #
Related terms: cytokines (IL‑6, TNF‑α), microglia activation, blood‑brain barrier dysfunction. High‑sugar diets elevate peripheral cytokines that can cross the BBB. Example: a Western diet raises IL‑6, correlating with depressive scores. Application: anti‑inflammatory diets to dampen neuroinflammation. Challenge: distinguishing cause from effect; inflammation may be both driver and consequence.
Neuroplasticity – ability of the brain to reorganize synaptic connections #
Related terms: long‑term potentiation (LTP), synaptogenesis, experience‑dependent remodeling. Omega‑3s, BDNF, and aerobic exercise synergistically enhance neuroplasticity. Example: combined fish oil and treadmill training improves LTP in rodent models of depression. Practical use: integrating diet and exercise for maximal plastic change. Challenge: measuring neuroplasticity in clinical settings relies on indirect biomarkers.
Neurotransmitter Synthesis – biochemical pathways generating serotonin, d… #
Related terms: precursor amino acids, co‑factor vitamins, enzyme activity. Dietary precursors (tryptophan, tyrosine) and cofactors (B6, B12, zinc) are essential. Example: low‑protein diets reduce tryptophan availability, lowering serotonin. Application: tailoring macronutrient composition to support specific neurotransmitter pathways. Challenge: competition among amino acids for transport across the BBB can limit efficacy.
Omega‑6/Omega‑3 Ratio – balance between pro‑inflammatory (omega‑6) and an… #
Related terms: linoleic acid, arachidonic acid, eicosapentaenoic acid (EPA). Western diets often have ratios >15:1, associated with higher depression prevalence. Example: reducing seed oil intake while increasing fish reduces ratio to ~4:1, improving mood. Practical implication: counseling on cooking oils and processed foods. Challenge: cultural dietary patterns may impede ratio modification.
Oxidative Stress – imbalance between ROS production and antioxidant defen… #
Related terms: lipid peroxidation, DNA damage, antioxidant enzymes (SOD, catalase). Chronic oxidative stress damages neuronal membranes, contributing to mood disorders. Example: high‑fructose diets increase ROS, worsening depressive symptoms. Application: antioxidant‑rich foods (berries, nuts) as part of treatment plans. Challenge: systemic antioxidant supplementation has mixed clinical outcomes; timing and dosage are critical.
Palmitic Acid – saturated fatty acid prevalent in animal fats and palm oi… #
Related terms: lipotoxicity, ER stress, inflammation. High intake can induce microglial activation and depressive‑like behavior in rodents. Example: diets >20 % energy from palmitic acid raise inflammatory markers. Practical advice: limit saturated fat to <10 % of total calories for mood health. Challenge: palmitic acid is also essential; complete elimination is not realistic.
Parvalbumin‑Positive Interneurons – GABAergic neurons crucial for network… #
Related terms: gamma oscillations, schizophrenia, fast‑spiking cells. Nutrients that support GABA synthesis (magnesium, zinc) may enhance interneuron function. Example: magnesium deficiency reduces parvalbumin expression, linked to anxiety. Application: assessing mineral status in patients with disrupted gamma rhythms. Challenge: direct measurement of interneuron health in vivo is not currently feasible.
Phytochemicals – plant‑derived bioactive compounds, such as flavonoids, c… #
Related terms: antioxidant capacity, hormesis, gut microbiota metabolism. Curcumin, a polyphenol, exhibits antidepressant‑like effects via NF‑κB inhibition. Example: 500 mg/day curcumin improves mood scores in clinical trials. Practical use: recommending culinary spices as adjuncts. Challenge: low bioavailability; formulations (e.g., phytosome) may be required.
Polyphenol‑Rich Foods – foods high in flavonoids, phenolic acids, and tan… #
Related terms: anthocyanins, catechins, resveratrol. Consumption correlates with lower depressive symptomatology. Example: daily blueberry intake (≈150 g) improves executive function and mood. Application: integrating fruit smoothies into meal plans. Challenge: sugar content of fruit may counteract benefits in insulin‑sensitive patients.
Probiotic – live microorganisms that confer health benefits when administ… #
Related terms: Lactobacillus, Bifidobacterium, microbiota modulation. Certain strains (L. helveticus) reduce cortisol and improve mood. Example: 10⁹ CFU/day of L. helveticus for 8 weeks lowered anxiety scores. Application: selecting strain‑specific products based on clinical evidence. Challenge: viability through the gastrointestinal tract and product shelf‑life.
Psychobiotics – subset of probiotics that influence mental health via the… #
Related terms: GABA‑producing bacteria, SCFA producers, neuroactive metabolites. Example: Bifidobacterium longum 1714 improves stress resilience in humans. Practical use: incorporating psychobiotic supplements into treatment regimens. Challenge: limited regulatory oversight and strain‑specific efficacy data.
Pyruvate – key metabolite linking glycolysis to the Krebs cycle #
Related terms: lactate dehydrogenase, mitochondrial respiration, energy substrate. Exogenous sodium pyruvate can support brain energy during hypoglycemia. Example: 500 mg pyruvate supplementation improved mental fatigue in a small trial. Application: short‑term use during high‑stress periods. Challenge: gastrointestinal side effects at higher doses.
Quercetin – flavonoid with antioxidant and anti‑inflammatory properties #
Related terms: flavonol, bioavailability, Nrf2 activation. Quercetin up‑regulates GDNF and reduces neuroinflammation. Example: 500 mg/day quercetin improved mood in a pilot study. Practical implication: recommending onion or apple skins as natural sources. Challenge: poor absorption; co‑administration with bromelain enhances uptake.
Reactive Oxygen Species (ROS) – chemically reactive molecules containing… #
Related terms: oxidative damage, antioxidant defenses, mitochondrial leakage. Elevated ROS in the brain associate with depressive phenotypes. Example: high‑fat diets increase neuronal ROS, impairing synaptic plasticity. Application: antioxidant-rich diet plans to mitigate ROS. Challenge: ROS also serve signaling roles; over‑suppression may hinder adaptation.
Receptor Sensitization – increased responsiveness of receptors after repe… #
Related terms: up‑regulation, desensitization, neuroadaptation. Chronic low‑dose caffeine can sensitize adenosine receptors, enhancing alertness. Example: moderate coffee intake improves mood via adenosine antagonism. Practical advice: timing caffeine to avoid sleep disruption. Challenge: individual tolerance varies widely.
Serotonin (5‑HT) – monoamine neurotransmitter regulating mood, appetite,… #
Related terms: tryptophan hydroxylase, SERT transporter, selective serotonin reuptake inhibitors (SSRIs). Dietary tryptophan competes with other large neutral amino acids for transport. Example: high‑protein meals increase competition, potentially lowering brain serotonin. Application: balancing protein intake with carbohydrate timing to favor serotonin synthesis. Challenge: peripheral serotonin does not cross the BBB; central effects depend on transport dynamics.
Short‑Chain Fatty Acids (SCFAs) – metabolites (acetate, propionate, butyr… #
Related terms: colon health, epigenetic modulation, energy source. Butyrate acts as an HDAC inhibitor, increasing BDNF expression. Example: high‑fiber diet raises fecal butyrate, correlating with lower depressive scores. Practical use: recommending 25–30 g of soluble fiber daily. Challenge: some patients experience bloating; gradual fiber increase is needed.
Signal Transduction – cascade of intracellular events following receptor… #
Related terms: second messengers, cAMP, MAPK pathway. Nutrients can modulate signaling; for instance, curcumin influences NF‑κB pathway. Example: turmeric supplementation reduces inflammatory signaling in mood disorders. Application: integrating anti‑inflammatory spices into therapeutic diets. Challenge: complex interactions with medications may alter drug metabolism.
Sirtuins – NAD⁺‑dependent deacetylases involved in cellular aging and met… #
Related terms: SIRT1, caloric restriction, mitochondrial biogenesis. Resveratrol activates SIRT1, enhancing neuroprotection. Example: 200 mg/day resveratrol improves depressive symptoms in a small cohort. Practical implication: using SIRT‑activating foods (red grapes) as part of mood‑supportive diets. Challenge: dose‑response unclear; high doses may interfere with anticoagulants.
Synaptic Plasticity – ability of synapses to strengthen or weaken over ti… #
Related terms: LTP, LTD, dendritic spine remodeling. Omega‑3 DHA incorporates into neuronal membranes, facilitating plasticity. Example: DHA supplementation improves visual‑cognitive performance in depressed patients. Application: recommending fish oil alongside cognitive therapy. Challenge: interindividual variability in DHA incorporation rates.
Thyroid Hormones – hormones (T₃, T₄) that regulate metabolism and neurode… #
Related terms: hypothyroidism, deiodinase enzymes, mood lability. Iodine deficiency can lower T₃, leading to depressive symptoms. Example: iodine supplementation (150 µg/day) improves mood in subclinical hypothyroid patients. Practical use: screening thyroid function in mood disorder work‑up. Challenge: excess iodine may precipitate autoimmune thyroiditis in susceptible individuals.
Triglyceride‑Glucose Index (TyG) – surrogate marker for insulin resistanc… #
Related terms: metabolic health, cardiovascular risk, mood correlation. Higher TyG scores associate with greater depressive severity. Example: lifestyle intervention lowering TyG improves both metabolic and mood outcomes. Application: using TyG as a quick screening tool in psychiatric clinics. Challenge: not all patients with high TyG respond to diet alone; pharmacologic support may be needed.
Ubiquinone (Coenzyme Q10) – component of the electron transport chain wit… #
Related terms: mitochondrial function, oxidative phosphorylation, cardiolipin stabilization. Supplementation improves energy production and reduces depressive fatigue. Example: 200 mg/day CoQ10 lowered fatigue scores in bipolar patients. Application: adding CoQ10 in patients with mitochondrial complaints. Challenge: CoQ10 bioavailability is low; lipid‑based formulations are recommended.
Vitamin D – secosteroid hormone influencing calcium homeostasis and immun… #
Related terms: 25‑hydroxyvitamin D, sunlight exposure, mood seasonality. Deficiency correlates with higher depression prevalence. Example: 2000 IU/day vitamin D supplementation improves depressive symptoms in winter. Practical recommendation: testing serum 25‑OH‑D and supplementing to >30 ng/mL. Challenge: genetic VDR polymorphisms affect response; monitoring is essential.
Vitamin B12 (Cobalamin) – co‑factor for methylation reactions and myelin… #
Related terms: methylmalonic acid, homocysteine, neurological health. Low B12 can elevate homocysteine, a risk factor for depression. Example: 1000 µg methylcobalamin weekly improves mood in vegans. Application: routine B12 screening in psychiatric patients, especially those on plant‑based diets. Challenge: absorption issues (pernicious anemia) require parenteral administration.
Vitamin C – water‑soluble antioxidant involved in neurotransmitter synthe… #
Related terms: ascorbic acid, collagen formation, cortisol reduction. High‑dose vitamin C (2 g/day) shows rapid antidepressant effects in pilot studies. Example: intravenous vitamin C improved mood in treatment‑resistant patients. Practical use: oral supplementation for mild depressive symptoms. Challenge: renal stone risk at very high intakes; dosing must be individualized.
Vitamin E (α‑Tocopherol) – lipid‑soluble antioxidant protecting cell memb… #
Related terms: oxidative stress, lipid peroxidation, neuroprotection. Supplementation reduces oxidative biomarkers in depression. Example: 400 IU/day vitamin E improved mood in elderly subjects. Application: adding vitamin E to antioxidant regimens. Challenge: high doses may interfere with clotting; monitor anticoagulant therapy.
Vagus Nerve Stimulation (VNS) – therapeutic technique delivering electric… #
Related terms: parasympathetic activation, neuroplasticity, treatment‑resistant depression. Diets rich in omega‑3s can enhance vagal tone, complementing VNS. Example: Mediterranean diet improves heart‑rate variability, a proxy for vagal activity. Practical implication: lifestyle optimization before invasive VNS. Challenge: patient acceptance and cost of device implantation.
Water‑Soluble Vitamins – vitamins that dissolve in water and require regu… #
Related terms: B‑complex, vitamin C, renal excretion. Deficiencies can impair neurotransmitter synthesis. Example: B‑complex supplementation reduces fatigue in depressive patients. Application: ensuring balanced B‑vitamin intake via diet or supplements. Challenge: excess intake is usually harmless, but can mask other deficiencies.
White Matter Integrity – structural connectivity of myelinated axons #
Related terms: diffusion tensor imaging (DTI), myelination, cognitive speed. Chronic inflammation can degrade white matter, affecting mood regulation. Example: omega‑3 supplementation preserves DTI metrics in elderly depressed cohorts. Practical use: monitoring white matter health as a biomarker for treatment efficacy. Challenge: imaging cost limits routine use.
Whey Protein – high‑quality protein containing all essential amino acids #
Related terms: branched‑chain amino acids (BCAAs), muscle synthesis, satiety. Whey can increase tryptophan availability when consumed with carbohydrate. Example: post‑exercise whey shake improves mood in athletes. Application: recommending whey as part of balanced meals. Challenge: lactose intolerance may require isolate or plant‑based alternatives.
Yohimbine – alkaloid that antagonizes α₂‑adrenergic receptors, increasing… #
Related terms: stimulant, anxiety, dosage timing. Low‑dose yohimbine can boost mood in some depressive subtypes. Example: 5 mg oral yohimbine improves alertness without excessive anxiety. Practical consideration: using under medical supervision due to cardiovascular effects. Challenge: narrow therapeutic window and potential for heightened anxiety.
Zinc – trace mineral involved in neurotransmission and immune function #
Related terms: metallothionein