Nutritional Psychiatry in Clinical Practice

Nutritional Psychiatry is an emerging interdisciplinary field that examines how dietary factors influence mental health outcomes. Mastery of its specialized terminology is essential for clinicians who integrate nutrition into psychiatric assessment and treatment. The following glossary provides a comprehensive, learner‑friendly explanation of the most frequently encountered terms, illustrated with practical examples and discussion of implementation challenges.

Gut‑Brain Axis refers to the bidirectional communication network linking the central nervous system with the enteric nervous system, immune signaling, and microbial metabolites. This axis operates through neural pathways (vagus nerve), endocrine routes (cortisol, ghrelin), and immune mediators (cytokines). For example, a patient with chronic anxiety may exhibit increased intestinal permeability, leading to systemic inflammation that exacerbates anxiety symptoms. Clinicians must therefore consider gastrointestinal health when addressing psychiatric complaints.

Psychobiotics are a subset of probiotics that produce neuroactive substances influencing mood, cognition, or behavior. Strains such as Lactobacillus rhamnosus and Bifidobacterium longum have been shown in animal models to modulate GABAergic signaling. In practice, a therapist might recommend a specific psychobiotic supplement to a patient with mild depression, monitoring changes in mood scales over a six‑week period. The main challenge lies in the limited human data and the need for strain‑specific evidence.

Prebiotic denotes nondigestible food components that selectively stimulate the growth or activity of beneficial gut microbes. Inulin, fructooligosaccharides, and resistant starch are common examples. A diet rich in prebiotic fiber can increase short‑chain fatty acid production, which in turn supports blood‑brain barrier integrity. When counseling patients, clinicians should advise gradual incorporation of high‑prebiotic foods (e.g., chicory root, Jerusalem artichoke) to avoid gastrointestinal discomfort.

Synbiotic describes a combination of probiotic and prebiotic that synergistically enhances microbial colonization. An example is a yogurt containing Lactobacillus plantarum plus inulin. Synbiotic formulations may offer greater therapeutic potential for mood disorders, but the complexity of product composition makes standardization difficult.

Microbiota‑Derived Metabolites include short‑chain fatty acids (acetate, propionate, butyrate), tryptophan metabolites, and bile acids that can cross the blood‑brain barrier or act on peripheral receptors. Butyrate, for instance, exhibits anti‑inflammatory properties and may improve depressive symptoms. Clinicians can assess dietary intake of fiber as a proxy for short‑chain fatty acid production, though direct measurement typically requires stool metabolomics, which is not yet routine in most psychiatric settings.

Neurotransmitter is a chemical messenger that transmits signals across synapses. Key neurotransmitters implicated in psychiatric disorders include serotonin, dopamine, norepinephrine, and gamma‑aminobutyric acid (GABA). Several nutrients serve as precursors; for example, tryptophan is the rate‑limiting amino acid for serotonin synthesis. Understanding these pathways enables clinicians to tailor dietary recommendations that support neurotransmitter balance.

Tryptophan is an essential amino acid found in turkey, cheese, soy, and pumpkin seeds. Its conversion to serotonin depends on adequate levels of vitamin B6, iron, and magnesium. A patient with low mood may benefit from a diet emphasizing tryptophan‑rich foods combined with cofactors that facilitate enzymatic conversion. However, high‑protein meals can compete for transport across the blood‑brain barrier, potentially limiting tryptophan uptake.

Omega‑3 Fatty Acids are long‑chain polyunsaturated fats, principally eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA). They are abundant in fatty fish (salmon, mackerel), algae, and certain nuts (walnuts). Omega‑3s modulate membrane fluidity, reduce neuroinflammation, and influence monoaminergic signaling. Randomized controlled trials (RCTs) have demonstrated modest benefit of EPA‑rich supplementation for major depressive disorder. Practical application involves assessing fish consumption, recommending 2–3 servings per week, or prescribing high‑purity EPA supplements when dietary intake is insufficient.

Alpha‑Linolenic Acid (ALA) is the plant‑based precursor to EPA and DHA, found in flaxseed, chia seeds, and canola oil. Conversion efficiency is low (<10 % in most adults), so reliance on ALA alone may not achieve therapeutic omega‑3 levels. Clinicians should educate patients on the limitations of plant sources and consider direct EPA/DHA supplementation, especially for individuals with limited fish intake.

Vitamin D functions as a neurosteroid, influencing neurotrophic factor expression, immune modulation, and serotonin synthesis. Deficiency is associated with increased risk of depression, schizophrenia, and cognitive decline. Serum 25‑hydroxyvitamin D measurement guides supplementation; typical therapeutic doses range from 1,000 to 4,000 IU daily, adjusted for baseline levels. Seasonal variation and limited sunlight exposure are common barriers, requiring proactive screening in high‑latitude regions.

B‑Vitamins comprise a group of water‑soluble vitamins (B1, B2, B3, B5, B6, B7, B9, B12) that act as co‑enzymes in energy metabolism and neurotransmitter synthesis. Folate (B9) and cobalamin (B12) are particularly relevant to mental health because they participate in one‑carbon metabolism, affecting methylation of DNA and neurotransmitter precursors. In practice, clinicians may order serum folate and methylmalonic acid to detect functional B12 deficiency, then recommend fortified grains, leafy greens, or oral/ injectable B12, depending on severity.

Methylation is a biochemical process that adds a methyl group to DNA, proteins, or neurotransmitters, influencing gene expression and enzymatic activity. Nutrients such as folate, B12, B6, and choline provide methyl donors. Impaired methylation pathways have been linked to mood disorders and psychosis. Assessing dietary intake of methyl‑nutrient‑rich foods (e.g., eggs, legumes, beef liver) and offering targeted supplementation can support optimal methylation capacity.

Choline is an essential nutrient that serves as a precursor for the neurotransmitter acetylcholine and contributes to phospholipid synthesis. It is abundant in egg yolk, liver, and soybeans. Adequate choline intake is crucial for memory and attention. In patients with cognitive complaints, clinicians may evaluate choline intake and consider supplementation, especially during pregnancy when choline demand increases.

Antioxidants neutralize reactive oxygen species (ROS) and mitigate oxidative stress, a process implicated in neurodegeneration and mood dysregulation. Key dietary antioxidants include vitamins C and E, carotenoids (β‑carotene, lycopene), flavonoids (quercetin, catechins), and polyphenols (resveratrol). A diet emphasizing colorful fruits, vegetables, nuts, and tea can enhance antioxidant capacity. Challenges arise from variability in bioavailability and the difficulty of quantifying antioxidant intake without specialized testing.

Inflammation is a physiological response to injury or infection, mediated by cytokines such as interleukin‑6 (IL‑6), tumor necrosis factor‑α (TNF‑α), and C‑reactive protein (CRP). Chronic low‑grade inflammation is associated with depression, bipolar disorder, and schizophrenia. Dietary patterns high in refined sugars, saturated fats, and processed foods promote inflammatory pathways, whereas anti‑inflammatory diets (e.g., Mediterranean) reduce them. Clinicians may use CRP as a biomarker to identify patients who could benefit from dietary anti‑inflammatory interventions.

Glycemic Load (GL) combines the glycemic index (GI) of a food with its carbohydrate content, estimating post‑prandial blood glucose impact. High GL diets can trigger rapid glucose spikes followed by crashes, leading to mood irritability and anxiety. For patients with mood instability, recommending low‑GL foods such as legumes, whole grains, and non‑starchy vegetables can stabilize blood sugar and improve affect.

Glycemic Index (GI) ranks carbohydrate foods on a scale from 0 to 100 based on their ability to raise blood glucose relative to glucose. Low‑GI foods (≤55) produce a slower, more sustained glucose release. Understanding GI helps clinicians counsel patients on timing of carbohydrate intake, especially those on psychotropic medications that affect appetite or weight.

Dietary Patterns encompass overall eating habits rather than isolated nutrients. Evidence indicates that certain patterns, such as the Mediterranean, DASH, and MIND diets, are linked to reduced risk of depression and cognitive decline.

Mediterranean Diet emphasizes plant‑based foods, olive oil, nuts, fish, and moderate wine consumption. It provides abundant polyphenols, omega‑3s, and fiber, supporting both cardiovascular and mental health. In a clinical setting, the therapist may use a Mediterranean adherence questionnaire to gauge patient compliance and set incremental goals (e.g., “Add one serving of oily fish per week”).

DASH Diet (Dietary Approaches to Stop Hypertension) focuses on reduced sodium, increased potassium, calcium, and magnesium through fruits, vegetables, low‑fat dairy, and whole grains. Its nutrient profile aligns with neuroprotective needs, making it a viable option for patients with comorbid hypertension and depression.

MIND Diet merges Mediterranean and DASH principles, targeting brain health by emphasizing leafy greens, berries, nuts, and whole grains while limiting red meat, butter, and sweets. Clinical trials have shown slower cognitive decline in adherents. Practitioners can incorporate MIND guidelines by encouraging daily berry consumption and weekly walnut snacks.

Food Matrix describes the physical and chemical interactions among nutrients, fiber, and phytochemicals within whole foods. The matrix influences nutrient absorption; for example, the presence of fat in a meal enhances carotenoid uptake. When counseling patients, clinicians should stress whole‑food consumption rather than isolated supplements to preserve matrix benefits.

Bioavailability refers to the proportion of a nutrient that is absorbed and utilized by the body. Factors affecting bioavailability include food preparation, presence of inhibitors (phytates, oxalates), and individual gastrointestinal health. For instance, iron from plant sources (non‑heme) has lower bioavailability than animal sources; pairing it with vitamin C‑rich foods (citrus fruit) can improve absorption.

Epigenetics studies how environmental factors, including diet, modify gene expression without altering DNA sequence. Nutrients such as folate, B12, and polyphenols can influence DNA methylation and histone acetylation, potentially affecting psychiatric risk. While epigenetic testing is not yet routine, clinicians can explain to patients how lifestyle choices may have lasting molecular impacts, reinforcing motivation for dietary change.

Nutrigenomics examines how an individual’s genetic makeup influences response to nutrients. For example, the FADS1 gene variant affects conversion efficiency of ALA to EPA/DHA. In the future, personalized nutrition plans may be generated based on genetic profiles, but current practice relies on population‑based guidelines.

Psychoneuroimmunology explores interactions among psychological processes, the nervous system, and immune function. Diet modulates immune activity, thereby influencing mood and cognition. Understanding this triad equips clinicians to adopt a holistic approach, addressing diet, stress management, and immunological health concurrently.

Clinical Assessment in nutritional psychiatry incorporates standard psychiatric evaluation plus dietary history. Tools include 24‑hour dietary recall, food frequency questionnaire (FFQ), and diet diaries. The 24‑hour recall captures recent intake, while the FFQ assesses habitual patterns over weeks or months. Clinicians should select the method that balances thoroughness with patient burden.

24‑Hour Dietary Recall involves asking the patient to recount everything consumed in the previous day, including portion sizes and preparation methods. It provides detailed data for nutrient analysis but may be affected by memory bias. Training staff in standardized interviewing techniques improves reliability.

Food Frequency Questionnaire (FFQ) lists common foods and asks the patient to indicate frequency of consumption over a specified period. FFQs are efficient for large‑scale screening but lack precision for micronutrient quantification. Combining an FFQ with a short recall can enhance accuracy.

Dietary Diary requires patients to record foods and beverages in real time over several days, typically 3–7 days, including weekends. This method captures day‑to‑day variability and can be used to identify patterns such as emotional eating. Digital apps simplify entry and can generate automated nutrient reports, though technology access may be a barrier for some populations.

Nutrient Biomarkers are laboratory measurements that reflect nutrient status more objectively than self‑report. Examples include serum 25‑hydroxyvitamin D, red blood cell omega‑3 index, plasma ferritin, and homocysteine levels. Biomarkers guide targeted supplementation and monitor treatment response. Limitations include cost, need for fasting, and variability due to acute phase responses.

Randomized Controlled Trial (RCT) is the gold‑standard research design that randomly assigns participants to intervention or control groups, minimizing bias. In nutritional psychiatry, RCTs evaluate the efficacy of dietary supplements, whole‑food interventions, or lifestyle programs on mental health outcomes. Clinicians should appraise RCTs for sample size, duration, adherence rates, and blinding adequacy before translating findings into practice.

Observational Study includes cohort, case‑control, and cross‑sectional designs that observe associations without manipulating variables. While valuable for hypothesis generation, observational studies cannot establish causality due to confounding factors. For instance, a cohort study linking high fruit intake with lower depression risk may be influenced by socioeconomic status or physical activity levels.

Meta‑Analysis statistically combines results from multiple studies to estimate overall effect size. A well‑conducted meta‑analysis of omega‑3 supplementation for depression reported a small but significant benefit, especially for EPA‑dominant formulations. Clinicians should evaluate the heterogeneity and publication bias reported in meta‑analyses to gauge reliability.

Effect Size quantifies the magnitude of an intervention’s impact, commonly expressed as Cohen’s d, odds ratio, or risk ratio. An effect size of 0.5 (medium) for a Mediterranean diet on depressive symptoms indicates a clinically meaningful improvement. Understanding effect size helps clinicians set realistic expectations with patients.

Confounding occurs when an extraneous variable influences both the exposure and outcome, distorting the observed relationship. In diet‑mental health research, physical activity is a frequent confounder; active individuals may both eat healthier and experience better mood. Adjusting for confounders in statistical models improves internal validity.

Placebo Effect describes symptom improvement due to patient expectations rather than the active ingredient. Nutritional interventions are susceptible to strong placebo responses, especially when patients anticipate health benefits. Including a placebo arm in RCTs, or using blinded supplement capsules, helps differentiate true efficacy from expectancy effects.

Adherence measures the extent to which patients follow prescribed dietary or supplement regimens. Low adherence undermines efficacy and complicates outcome interpretation. Strategies to improve adherence include meal planning, cooking workshops, and motivational interviewing.

Motivational Interviewing (MI) is a collaborative communication style that enhances intrinsic motivation for behavior change. In nutritional psychiatry, MI can explore ambivalence about dietary modifications, set personalized goals, and reinforce self‑efficacy. Practitioners should use open‑ended questions, reflective listening, and summary statements to facilitate patient‑led change.

Behavior Change Theory provides frameworks such as the Transtheoretical Model, Health Belief Model, and Social Cognitive Theory to understand how individuals adopt new habits. Applying these models helps clinicians design interventions that address perceived barriers, self‑regulation, and social support.

Food Insecurity describes limited or uncertain access to nutritionally adequate food. Food‑insecure patients are at higher risk for nutrient deficiencies and mental health disorders. Screening tools like the USDA Food Security Survey Module can identify at‑risk individuals, enabling referrals to community resources (food banks, SNAP benefits).

Socio‑Cultural Factors influence dietary preferences, meal patterns, and attitudes toward nutrition. Cultural norms may dictate staple foods, fasting practices, or taboos, affecting nutrient intake. Sensitivity to these factors is crucial; for example, recommending fish to a vegetarian patient requires alternative omega‑3 sources such as algae oil.

Allergenicity concerns the potential of certain foods to trigger immune reactions. Patients with food allergies (e.g., shellfish) may be unable to consume omega‑3 rich fish, necessitating specialized supplementation. Clinicians must verify allergy status before prescribing dietary changes.

Supplementation involves providing isolated nutrients in pill, powder, or liquid form. While supplements can correct deficiencies quickly, they may lack the synergistic effects of whole foods. For instance, isolated vitamin E does not replicate the antioxidant network present in nuts and seeds. Clinicians should prioritize food first, supplement only when dietary intake is insufficient or when biomarkers indicate deficiency.

Dosage denotes the amount of a nutrient delivered per serving or per day. Therapeutic dosages often exceed the Recommended Dietary Allowance (RDA). For example, 2 g of EPA per day may be prescribed for depressive symptoms, surpassing the typical dietary intake of 250 mg. Monitoring for adverse effects (e.g., bleeding risk with high omega‑3 doses) is essential.

Safety Profile assesses potential adverse reactions, contraindications, and drug‑nutrient interactions. Certain nutrients can interact with psychiatric medications; high‑dose vitamin K can affect warfarin metabolism, while magnesium may potentiate the sedative effects of benzodiazepines. Comprehensive medication reconciliation should include supplement review.

Drug‑Nutrient Interaction describes how nutrients alter the pharmacokinetics or pharmacodynamics of medications. For example, St. John’s Wort induces cytochrome P450 enzymes, reducing plasma levels of certain antidepressants. Clinicians must educate patients about over‑the‑counter herbal products that could compromise treatment efficacy.

Personalized Nutrition tailors dietary recommendations to individual characteristics such as genetics, microbiome composition, lifestyle, and health status. While the field is still evolving, tools like microbiome sequencing and nutrigenomic panels are becoming more accessible. Practitioners can begin personalization by integrating patient preferences, cultural context, and metabolic health indicators into the dietary plan.

Implementation Science studies how to translate evidence‑based nutritional interventions into routine clinical practice. Barriers include limited time in psychiatric appointments, lack of nutrition training, and reimbursement constraints. Solutions involve interdisciplinary collaboration (dietitians, psychologists), use of tele‑nutrition platforms, and incorporation of brief screening tools into electronic health records.

Screening Tools for nutritional risk include the Mini Nutritional Assessment (MNA) and the Malnutrition Universal Screening Tool (MUST). These instruments quickly identify patients who may benefit from detailed dietary evaluation. Embedding a short nutrition screen into the intake workflow can flag at‑risk individuals without adding substantial burden.

Interdisciplinary Collaboration is vital for integrating nutrition into psychiatric care. Dietitians provide expertise in meal planning, while psychiatrists manage medication and psychotherapy. Regular case conferences, shared care plans, and clear referral pathways enhance coordination.

Education Materials such as patient handouts, visual portion guides, and digital resources support self‑management. Materials should be culturally appropriate, use plain language, and include actionable steps (e.g., “Add one serving of leafy greens each dinner”).

Outcome Measures in nutritional psychiatry trials often include standardized rating scales (PHQ‑9 for depression, GAD‑7 for anxiety), quality‑of‑life questionnaires, and cognitive tests (Montreal Cognitive Assessment). Biological outcomes may comprise inflammatory markers (CRP), lipid profiles, and neuroimaging findings. Selecting appropriate outcomes aligns research objectives with clinical relevance.

Statistical Power reflects the ability of a study to detect a true effect. Small sample sizes in nutrition trials can lead to type II errors, mistakenly concluding no benefit. When designing a clinical protocol, investigators should perform power calculations based on expected effect size and variability to ensure adequate participant numbers.

Duration of Intervention influences the magnitude of observable changes. Short‑term studies (≤8 weeks) may capture acute mood shifts, whereas longer trials (≥6 months) are needed to assess sustained dietary adherence and neuroprotective effects. Clinicians should set realistic timelines for patients, emphasizing gradual, maintainable changes.

Compliance Monitoring can involve self‑reported logs, pill counts, or biochemical verification (e.g., plasma omega‑3 index). Combining objective and subjective measures provides a more comprehensive picture of adherence.

Ethical Considerations include informed consent, especially when recommending experimental dietary protocols. Patients should understand the evidence base, potential benefits, and risks. Confidentiality of dietary data, particularly when using digital tracking apps, must be safeguarded.

Cost‑Effectiveness analyses compare the economic value of nutritional interventions against standard psychiatric care. Studies suggest that diet‑based approaches may reduce overall healthcare utilization by lowering medication doses and hospitalizations. Demonstrating cost savings can support reimbursement negotiations with insurers.

Regulatory Landscape varies by region. In many countries, supplements are regulated as foods rather than drugs, affecting quality control and labeling accuracy. Clinicians should recommend products that have third‑party testing (e.g., USP, NSF) to ensure purity and potency.

Research Gaps highlight areas needing further investigation, such as the optimal composition of psychobiotic blends, the long‑term cognitive effects of Mediterranean diet adherence, and mechanisms linking specific micronutrients to neurotransmitter pathways. Awareness of these gaps guides clinicians in interpreting current evidence with appropriate caution.

Case Example: Depression and Mediterranean Diet A 38‑year‑old woman presents with moderate major depressive disorder (MDD) refractory to selective serotonin reuptake inhibitor (SSRI) monotherapy. A dietary assessment reveals low intake of fruits, vegetables, and fish, with high consumption of refined carbohydrates. Laboratory testing shows borderline low 25‑hydroxyvitamin D (22 ng/mL) and elevated CRP (4.2 mg/L). The treatment plan incorporates:

1. Prescription of 2,000 IU vitamin D daily, rechecking levels after eight weeks. 2. Introduction of a Mediterranean‑style meal plan, targeting three servings of oily fish per week, daily nuts, and at least five servings of vegetables. 3. Referral to a registered dietitian for meal planning and cooking skill workshops. 4. Use of motivational interviewing to explore barriers (time constraints, family preferences) and set SMART goals (Specific, Measurable, Achievable, Relevant, Time‑bound).

After twelve weeks, the patient’s PHQ‑9 score improves from 15 to 8, CRP declines to 2.1 mg/L, and vitamin D rises to 30 ng/mL. This case illustrates how integrating nutritional terminology—such as “CRP,” “Mediterranean diet,” and “SMART goals”—facilitates a cohesive, evidence‑based approach.

Case Example: Psychosis and Omega‑3 Supplementation A 21‑year‑old male with first‑episode psychosis is stabilized on antipsychotic medication but experiences persistent negative symptoms. Baseline omega‑3 index is 3.5 % (low). A double‑blind RCT protocol recommends 1.5 g EPA + DHA per day for six months. The clinician monitors for bleeding risk, interacts with the pharmacy to ensure high‑purity fish oil, and schedules monthly follow‑ups to assess adherence via plasma omega‑3 levels. At study completion, the patient shows modest improvement in negative symptom scales and an increased omega‑3 index (6.2 %). This scenario underscores the importance of “omega‑3 index,” “double‑blind,” and “adherence monitoring” in practice.

Practical Tips for Clinicians

- Begin with a brief nutrition screen during the initial psychiatric interview; a few targeted questions about fruit, vegetable, and fish intake can reveal major gaps. - Prioritize whole‑food recommendations before considering supplements; the synergy of nutrients within the food matrix often yields superior outcomes. - Use visual aids (e.g., plate method) to illustrate portion sizes and balance of macronutrients. - Document all supplement use in the medication list to avoid overlooked drug‑nutrient interactions. - Schedule follow‑up appointments that specifically address dietary progress, reinforcing successes and troubleshooting obstacles. - Collaborate with dietitians for complex cases involving malnutrition, eating disorders, or metabolic comorbidities.

Challenges in Clinical Implementation

1. **Time Constraints** – Psychiatric appointments are frequently limited to 15‑20 minutes, making comprehensive dietary counseling difficult. Solutions include delegating detailed nutrition education to allied health professionals or employing brief digital screening tools.

2. **Training Gaps** – Many psychiatrists lack formal nutrition education. Continuing medical education (CME) courses, webinars, and interdisciplinary workshops can bridge this knowledge gap.

3. **Patient Motivation** – Dietary change requires sustained effort; patients may experience relapse during periods of stress. Incorporating behavioral techniques such as MI and goal‑setting can enhance motivation.

4. **Access and Affordability** – Healthy foods can be cost‑prohibitive for low‑income patients. Clinicians should be familiar with community resources (food pantries, subsidized produce programs) and consider prescribing cost‑effective nutrient sources (e.g., fortified cereals for B‑vitamins).

5. **Cultural Acceptability** – Dietary recommendations must respect cultural dietary patterns. Tailoring suggestions to culturally familiar foods improves adherence. For example, recommending lentils and chickpeas as plant‑based protein sources aligns with many Mediterranean and South Asian diets.

6. **Measurement Limitations** – Self‑reported dietary data are prone to recall bias. Combining subjective tools with objective biomarkers where feasible enhances accuracy.

7. **Evidence Variability** – The literature on nutrition and mental health includes heterogeneous study designs, varying dosages, and inconsistent outcome measures. Clinicians must critically appraise the quality of evidence and apply it judiciously.

8. **Regulatory Uncertainty** – Supplements are not subject to the same rigorous testing as pharmaceuticals, leading to variability in product quality. Recommending third‑party certified products mitigates this risk.

Future Directions

- Integration of **digital health platforms** that provide real‑time dietary tracking, automated nutrient analysis, and tele‑nutrition counseling. - Expansion of **microbiome‑targeted therapies**, including personalized psychobiotic formulations based on individual microbial profiles. - Development of **combined lifestyle interventions** that address diet, physical activity, sleep hygiene, and stress management in a unified protocol. - Greater emphasis on **preventive nutrition** in early‑life mental health, exploring how prenatal and childhood dietary patterns influence long‑term psychiatric risk.

By mastering the terminology outlined above, clinicians will be equipped to translate the rapidly evolving science of nutritional psychiatry into practical, patient‑centered care. The detailed understanding of concepts such as the gut‑brain axis, psychobiotics, and dietary patterns enables nuanced assessment, evidence‑based intervention, and effective collaboration across disciplines, ultimately enhancing mental health outcomes through nutrition.