Place · Level 3 · Condition

Depression & Anxiety · Nutritional Psychiatry

5-HT 单胺假说不够 · 肠脑轴 + 炎症 + 营养缺失 · SMILES 2017 RCT · 不替代心理、药物治疗

Story path

1More than 'feeling sad'More than 'feeling sad'
24 neuro models4 neuro models
3SMILES 2017 trialSMILES 2017 trial
4Complete tx spectrumComplete tx spectrum
5Decision treeDecision tree

Chapter 1

More than 'feeling sad'

Major depressive disorder (MDD) + anxiety disorders (GAD / panic / social) are the most common psychiatric illnesses of our time and one of the most under-discussed health topics on this atlas.

Global epidemiology (WHO 2024 + China Chen 2017 BMC Psychiatry):

MDD lifetime prevalence: China 6.9% / global 5-15%Any anxiety disorder: China 7.6% / global 14-20%Comorbidity: ~ 50% overlap between MDD + anxietyUndiagnosed / untreated: 80%+ in ChinaPost-pandemic: global depression + anxiety up 25-30% in 2020-2022
Why this atlas must cover it:

1 in 10 people will experience a serious mood disorderNutrition / exercise / sleep all influence symptoms, but nutritional psychiatry remains seriously neglectedImportant warning: this island is not a substitute for treatment — moderate / severe patients need medication + psychotherapy
Diagnosis (DSM-5):

MDD: ≥ 5 symptoms, ≥ 2 weeks, including at least one core symptom:

Depressed mood (most of the time)Anhedonia (loss of interest in previously enjoyable activities)Plus: appetite change / sleep change / psychomotor retardation or agitation / fatigue / worthlessness or guilt / poor concentration / thoughts of death or suicide
GAD: excessive anxiety + worry, difficult to control, ≥ 6 months + ≥ 3 symptoms (restlessness / easy fatigue / poor concentration / irritability / muscle tension / insomnia)

Screening tools (used both clinically and self-administered):

PHQ-9 (Patient Health Questionnaire-9): 9 items, 0-27; ≥ 10 = depressionGAD-7: 7 items, 0-21; ≥ 10 = anxietyChinese versions are validated; can be self-completed in 15 minutes
Red flags (immediate care):

Suicidal ideation / planSelf-harm behaviourSevere inability to self-carePsychotic symptoms (hallucinations / delusions)Emergency: call the national mental-health hotline 400-161-9995 or local emergency services
This atlas island covers:

Why the monoamine hypothesis (5-HT/DA/NE) is insufficientThe gut-brain axis + inflammation + nutritional-deficiency modelEvidence from SMILES RCT and other nutritional-psychiatry trialsThe practical intervention spectrum (exercise / sleep / diet / sunlight / medication / therapy)

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Chapter 2

4 neuro models

Depression neuroscience has moved beyond the simplistic "low 5-HT" model; the modern view is four mutually complementary theories:

① Monoamine hypothesis (traditional):

Low synaptic serotonin (5-HT) / norepinephrine (NE) / dopamine (DA) → depressionThe main mechanism of SSRIs / SNRIs — block reuptake, ↑ synaptic monoamine availabilityLimitation: drug efficacy takes 2-4 weeks to appear, while monoamine concentrations rise within hours — direct monoamine replacement is not the fundamental mechanism
② Neuroplasticity + BDNF hypothesis:

BDNF (brain-derived neurotrophic factor) is significantly reduced in depression, especially in the hippocampusChronic stress → cortisol → ↓ hippocampal neurogenesis + dendritic atrophy → depressionSSRI's true action: indirectly ↑ BDNF + new neurons — explaining the 2-4 week onsetExercise + learning + sunlight + nutrient-dense diet all directly raise BDNF
③ Gut-brain axis:

Gut microbiota ↔ vagus + short-chain fatty acids + endotoxin + tryptophan metabolism → brainDepressive patients have significantly altered gut composition (Lactobacillus / Bifidobacterium ↓)"Psychobiotics" — some strains (L. helveticus, B. longum) show antidepressant signals in small trials (Pinto-Sanchez 2017 Gastroenterology)Depression has an inflammatory basis: ↑ / / → BBB → central inflammation → ↓ 5-HT synthesis + neuronal injuryThe mechanistic basis of nutritional intervention lives here
④ hypothalamic–pituitary–adrenal axis: The body's stress-response chain (hypothalamus → pituitary → adrenal) that releases cortisol.-axis dysregulation + chronic stress:

Hypothalamic-pituitary-adrenal axis: stress → CRH → ACTH → cortisolChronic stress → sustained high cortisol → hippocampal damage + feedback failure"Stress that can't be turned off": covered in atlas ashwagandha + endocrine/HPA L4
How the four models integrate:

```
stress → HPA activation → ↑ cortisol + inflammation
↓
gut dysbiosis + endotoxin
↓
permeability + central inflammation
↓
↓ BDNF + ↓ neurogenesis
↓
↓ monoamine synthesis (5-HT requires tryptophan, but IDO diverts tryptophan to the kynurenine pathway)
↓
depression
```

This is why single interventions have limited effect but combined interventions stack:

SSRI repairs monoamines + indirectly BDNFExercise ↑ BDNF + ↓ inflammationNutrition repairs microbiota + ↓ inflammation + provides neurotransmitter precursorsPsychotherapy repairs cognition + behaviourSleep repairs BDNF + HPA
The "tryptophan → 5-HT" marketing trap:

"Eat more tryptophan (turkey / milk) and depression will improve"Truth: tryptophan must compete with other large neutral amino acids (LNAA) at the BBB; large protein meals actually reduce brain 5-HT synthesisThe old "high-carb meals → 5-HT" idea is over-simplified5-HTP supplements (intermediate of tryptophan): crosses BBB but bypasses feedback regulation → cardiovascular + serotonin-syndrome risk; depression evidence is weakTruly effective nutritional interventions are whole dietary patterns (next scene SMILES), not single amino acids

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Chapter 3

SMILES 2017 trial

The SMILES Trial (Jacka et al 2017 BMC Medicine) is the first causal RCT in nutritional psychiatry:

Design:

N = 67 moderate-to-severe MDD patients (PHQ-9 ≥ 12)Modified Mediterranean diet (ModiMedDiet) vs social support × 12 weeksKey: most participants were already on SSRI / psychotherapy — this is "diet as adjunct," not "diet as replacement"
ModiMedDiet content:

Whole grains / vegetables / fruit / legumes / low-fat dairy / nuts / fish / eggs / olive oil / moderate red meatRestrict: sweets / refined grains / fried foods / processed meat / soft drinks / alcohol= modified Mediterranean = low-UPF diet
Results:

MADRS (Montgomery-Åsberg Depression Rating Scale):Diet arm ↓ 11 pointsControl ↓ 4 points7-point difference, clinically significantRemission rate (MADRS < 10):Diet arm 32%Control 8%NNT = 4 (1 in 4 treated reaches remission — lower than many drugs)Anxiety scores also improvedSide effects: near zero
Replications:

HELFIMED 2019 (Parletta, N = 152): similar design, same directionAMMEND 2024 (Wagner-Skacel): nutritional-psychiatry comprehensive metaAdjayi-Mahomoud 2022 (France, N = 100): UPF-halved diet → significant PHQ-9 drop (atlas UPF story)
Conclusions (nutritional-psychiatry 2024 consensus):

Mediterranean / DASH / low-UPF diets as adjunctive therapy: Level B-A evidenceCannot replace medication / psychotherapy — but can substantially synergisePrevention (healthy people): long-term low UPF + nutrient-dense diet shows an inverse dose-response with depression risk (atlas UPF story Lane 2023 BMJ)
Key nutrients (individual evidence):

① Omega-3 (EPA-dominant):

EPA > 60% (not DHA-dominant) + ≥ 1 g/day → Level B adjunctive for depression (Mocking 2016 meta)Solo effect small; adjunct to SSRI synergy is more pronounced
② Vitamin D:

Deficiency (< 30 ng/mL) associated with depression (Anglin 2013 meta)But RCT evidence for supplementation improving depression is inconsistent — possibly association without causation, or efficacy only in deficiency
③ Folate + B12:

Deficient individuals (especially older / vegan / MTHFR polymorphism) have higher depression riskL-methylfolate (Deplin) is an SSRI adjunct (Papakostas 2012 Am J Psychiatry)
④ Mg:

Small trials show Mg supplementation improves depression / anxiety (Tarleton 2017)Mechanism likely NMDA-receptor modulation + GABA +
⑤ Zn:

Deficiency associated with depression + supplementation improves it (Wang 2018 meta)
Warnings:

5-HTP / SAMe / St John's wort: with SSRI → serotonin syndrome (dangerous)L-tryptophan: transport competition limits effect + ordinary dietary amounts are fine; high-dose supplement evidence is weakAny nutritional intervention + prescription medication → discuss with the psychiatrist, do not self-titrate

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Chapter 4

Complete tx spectrum

Depression + anxiety treatment — the full spectrum (by evidence level + indication):

First-line: psychotherapy (preferred for mild-to-moderate):

CBT (cognitive behavioural therapy): Level A, 8-20 sessions, long-term effect not inferior to medicationIPT (interpersonal therapy): when relationships are centralMBCT (mindfulness-based cognitive therapy): Level A for relapse preventionMindfulness + ACT (acceptance and commitment): Level B-A for anxietyDigital CBT (iCBT): online platforms; not a complete substitute for in-person, but markedly better than no treatment
First-line: medication:

SSRI (fluoxetine / paroxetine / sertraline / citalopram / escitalopram): onset 2-4 weeks, Level ASNRI (venlafaxine / duloxetine): SSRI + dual NE channelMirtazapine: commonly used in older adults + poor appetite + insomniaBupropion: no sexual side effects + aids smoking cessationtricarboxylic acid (Krebs) cycle: The mitochondrial hub cycle that fully oxidizes fuel and harvests electrons for energy. (tricyclics): older drugs, effective but more side effects, rarely first-line nowMAOI: rarely used now
New drugs (2020s):

Esketamine (Spravato) nasal spray: treatment-resistant MDD, rapid onset (hours-days), FDA-approved 2019Brexanolone / Zuranolone: postpartum depression, GABA-A modulationPsychedelic research (psilocybin, MDMA): positive Phase III trials, regulatory review in some countries — important new direction but far from clinically widespread
That is the clinical menu of medication + psychotherapy. Turn the page for the three common SSRI misconceptions + four non-drug levers (exercise / light / sleep / social) + when to seek professional help.

SSRI myths + non-drug treatments + when to seek help

Common SSRI misconceptions:

"SSRIs change personality / are addictive": wrong — not addictive substances, but tapering must be gradual (weight / dizziness / "brain zaps" discontinuation syndrome)"SSRI sexual side effects": real, 30-50 % in some patients; alternatives exist (bupropion / mirtazapine)"SSRI is slow = useless": standard 2-4 week window, full evaluation at 6-8 weeks
Exercise — antidepressant evidence Level A:

150 min/week moderate aerobic → significant depression-score dropCooney 2013 Cochrane meta: exercise vs control = moderate-to-large effect size, comparable to medication; Schuch 2018 + JAMA Psychiatry 2022 (Heissel) replicatedMechanism: BDNF + endorphins + self-efficacy + sleep + socialThree elements: intensity + frequency + persistence; a 30-minute walk is more sustainable than occasional HIIT
Light therapy: first-line for seasonal affective disorder (SAD) — morning 10,000 lux light box for 30 minutes; non-seasonal MDD as adjunct (Level B).

Sleep: depression + insomnia have bidirectional causality (atlas `insomnia` + `shift-work-circadian`); CBT-I doesn't conflict with SSRI — combination effect is stronger.

Social support + relationships: isolation is one of the strongest modifiable risk factors for depression. Not "see friends more" — meaningful interpersonal connection.

When to see a professional:

PHQ-9 ≥ 10 or GAD-7 ≥ 10: see psychiatry / psychological counselling≥ 2 weeks of persistence + functional impairment: sameSuicidal ideation → immediate careIf self-adjustment isn't working long-term: don't blame yourself — seek professional help
Key cautions: depression + anxiety are not "lack of willpower" or "melodrama" — they are diseases with a neurobiological basis. "Just think positively" / "you have nothing to worry about" is misaligned comfort that worsens guilt. Stigma is one of the main reasons for low Chinese clinic-attendance rates — this island is written to reduce that stigma.

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Chapter 5

Decision tree

"I might have depression / anxiety" — self-check + action:

Step 1 · Self-check (5 minutes):

Take PHQ-9 + GAD-7 online (national health platforms + some apps)Scoring:0-4: none / minimal — just maintenance5-9: mild — start with lifestyle + counselling10-14: moderate — strongly recommend professional help15+: severe — see a doctor immediately
Step 2 · Severity → corresponding pathway:

Mild (PHQ < 10, minor functional impact):

The 8 lifestyle levers (below)Digital CBT (e.g., "Simple Psychology" / "KnowYourself" / "HaoXinQing" Chinese platforms)Re-score PHQ-9 monthlyNo improvement → escalate
Moderate (PHQ 10-14):

Professional counselling / therapy (CBT preferred)+ consider medication (discuss with physician, not mandatory)+ lifestyle interventionRe-assess every 2-4 weeks
Severe (PHQ ≥ 15):

Must see psychiatry / psychosomatic medicineCombined medication (SSRI/SNRI) + psychotherapyAssess suicide risk (Columbia scale)Some require brief hospitalisation
Suicide risk:

Immediately call: National mental-health hotline 400-161-9995Beijing Suicide Research and Prevention Center: 010-82951332Shanghai hotline: 021-12320-5Local emergency (any time)

Step 3-4 · lifestyle + nutrition

Step 3 · 8 lifestyle levers (ROI order):

Exercise: 150 min/week moderate aerobic → significant depression-score drop (Level A, comparable to medication)
Sleep: 7-9 h + regular + CBT-I for insomnia
Nutrition: Mediterranean / DASH / low-UPF diet (SMILES Level B-A)
④ Sunlight + outdoors: morning light + natural environment + vitamin D
⑤ Social: meaningful interpersonal connection (isolation is the strongest risk)
⑥ Cut / reduce alcohol: alcohol relieves briefly + worsens depression long-term
⑦ Limit screens + social media: chronic SoMe → anxiety + depression signal
⑧ Mindfulness / meditation: apps (Headspace / Calm / 一念) + in-person classes

Step 4 · Nutritional support (adjunctive, not replacement):

Omega-3 (EPA-dominant): 1-2 g/day, choose EPA > 60% productsVitamin D: ≥ 800-2000 IU/day if deficientB12 + folate: monitor in long-term vegetarian / older / MTHFR-polymorphism individualsMg: 300-400 mg/day (glycinate or citrate)Zn: 8-15 mg/day in deficient (vegetarian + low red meat)Avoid: 5-HTP / St John's wort / SAMe + SSRI combination (serotonin syndrome)

Step 5 · maintenance + warnings + stance

Step 5 · Long-term maintenance:

Continue applying CBT skills (even after symptom remission)Relapse prevention: MBCT + regular exercise + life rhythmSlow taper of medication (with the doctor, minimum 8-12 months)Recognise relapse signals early: sleep changes / appetite changes / loss of interest → intervene immediately
Important warnings:

"Influencer psychology advice": use cautiously, most lack professional credentials"Emotional management courses": some commercial courses overpromise, do not replace real treatment"Antidepressant supplements": most have weak evidence + commercial markup"TCM for depression": individual signals exist (Xiaoyaosan etc.) but insufficient evidence for first-line use
Atlas position (reiteration):

Depression + anxiety are diseases — not weak character / weak will / dramaStigma is the main reason for low Chinese clinic-attendance rates — this island is written so you feel less aloneLifestyle + nutrition are adjuncts, not replacements for medication / psychotherapyEarly intervention + complete treatment + long-term maintenance = most patients improve substantiallyFinding the right doctor / therapist may take 2-3 tries — do not give up after the first mismatchRecovery / remission ≠ perfection — it is "returning to a state in which you can live the life you want"

Stigma + finding therapy in China

"I have depression but I'm afraid to see a doctor" — China's mental-health clinic-attendance rate is only 9.5% vs 40-50% in the West. Stigma + not knowing where to go + concerns about records = the three main barriers.

Debunking stigma:

"Seeing a psychiatrist = I'm crazy" → wrong. Depression is a neurochemical brain disorder, like diabetes"My employer will find out" → in China, public-hospital records are in principle not actively disclosed to employers"It will affect dating / promotion" → some careers (civil service / pilots) have restrictions on psychiatric history, most ordinary jobs have no explicit restrictions"Others tough it out, so I can too" → wrong. You can't see what others are quietly treating
Practical paths to finding counselling / therapy:

A. Public hospitals (insurance + prescribing + appropriate for severe cases):

General-hospital psychiatric / psychosomatic departments (most Tier-3 hospitals)Specialty centers: Anding (Beijing) / Shanghai Mental Health Center / Nanjing Brain HospitalPros: insurance + prescriptions; cons: short visit (10-15 min) + limited psychotherapy resources + waits
B. Private psychological counselling (CBT / talk therapy):

Platforms like Simple Psychology / 壹心理 / KnowYourselfNational Level-2 / Level-3 counsellor credentialsFees: ¥300-1500 per 50 minutesFrequency: weekly × 12-20 weeksPros: ample time + genuine psychotherapy + privacy; cons: out-of-pocket + variable quality + no prescriptions
C. Online video counselling + digital CBT (apps, starter):

Same platforms above with video + textApps: HaoXinQing / XinQing / Woebot, Headspace, CalmAdvantages: cheap + anytime + anonymous; limits: moderate-or-above needs in-person
Criteria for choosing a counsellor / physician:

1. Credentials: national Level-2 / Level-3 counsellor, or licensed psychiatrist
2. Modality: CBT (most evidence) / psychodynamic / EMDR / mentalisation
3. Feeling in the first session: can you relax enough to speak in 10 minutes? If not, switch
4. Does not push intensive packages / does not sell courses / does not insist on private WeChat contact
5. No felt improvement after 2-3 sessions → switch (it's not you, it's the fit)

When to escalate to psychiatry + medication:

PHQ-9 ≥ 15 (severe)Suicidal ideation / self-harm behaviourSevere impact on work / studies / lifeNo significant improvement with counselling after 3 monthsBipolar (history of mania / hypomania) — must see psychiatry + mood stabilisers
What family + friends can do:

Listen ≠ solve — don't rush to give advice"You need to pull yourself together" / "Stop overthinking" = worsens stigmaRecommend seeking care + accompany to appointments + reduce questioningLearn the basics of depression and anxietyTake care of yourself too (caregiver burnout is real)
Atlas connections: insomnia (insomnia is a sentinel + comorbidity of depression) + perimenopause (E2 withdrawal + depression risk) + menstrual-cycle (PMDD) + sleep-apnea + adaptogens (Rhodiola).

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