Chapter 3: Constitutional Medicine

Deep Dive into Constitution Types and Their Multi-Omics Correlates

3.1 The Concept of Constitution

Constitution (體質 in Chinese, Prakriti in Sanskrit, 체질 in Korean) refers to the relatively stable physical and psychological characteristics that influence an individual's susceptibility to disease, response to treatment, and optimal lifestyle choices. Unlike disease states that come and go, constitution is considered a fundamental aspect of individual identity.

Constitution vs. Condition: Constitution represents one's baseline tendencies (like hardware), while conditions are temporary states (like software). Treatment aims to restore balance within one's constitutional framework, not to change the constitution itself.

3.2 TCM Nine Constitution Types in Detail

1. Balanced Constitution (平和質 Píng hé zhì)

Characteristics: Healthy complexion, normal energy, good appetite and digestion, regular sleep, emotional stability

Omics Correlates: Optimal metabolic markers, diverse gut microbiome, balanced inflammatory markers

Prevalence: Approximately 32% of population

2. Qi Deficiency Constitution (氣虛質 Qì xū zhì)

Characteristics: Fatigue, weak voice, shortness of breath, spontaneous sweating, susceptibility to colds

Omics Correlates: Reduced mitochondrial function markers, altered energy metabolism, lower immune markers (IgA, NK cells)

Associated Genes: HIF1A polymorphisms, mitochondrial DNA variants

Dietary Guidance: Warm, easily digestible foods; avoid raw, cold foods

3. Yang Deficiency Constitution (陽虛質 Yáng xū zhì)

Characteristics: Cold intolerance, cold extremities, preference for warmth, pale complexion, loose stools

Omics Correlates: Reduced thermogenesis markers (UCP1), hypothyroid-like metabolic patterns, altered catecholamine metabolism

Associated Genes: ADRB3, UCP variants

Dietary Guidance: Warming foods (ginger, cinnamon); avoid cold, raw foods

4. Yin Deficiency Constitution (陰虛質 Yīn xū zhì)

Characteristics: Heat sensations, night sweats, dry skin/throat, red cheeks, restlessness

Omics Correlates: Elevated oxidative stress markers, altered cortisol rhythm, reduced parasympathetic tone

Associated Genes: NR3C1 (glucocorticoid receptor) variants

Dietary Guidance: Cooling, moistening foods; avoid spicy, fried foods

5. Phlegm-Dampness Constitution (痰濕質 Tán shī zhì)

Characteristics: Overweight, greasy skin, heavy sensation, chest stuffiness, sweet/sticky mouth

Omics Correlates: Elevated triglycerides, insulin resistance markers, Bacteroides-dominant microbiome, altered lipid metabolism

Associated Genes: FTO, MC4R, PPARG

Dietary Guidance: Light, bland foods; avoid greasy, sweet foods; regular exercise essential

3.3 Ayurvedic Prakriti Analysis

Aspect Vata Pitta Kapha
Elements Air + Space Fire + Water Earth + Water
Body Frame Thin, light Medium, muscular Large, solid
Skin Dry, rough Warm, oily Thick, moist
Digestion Variable Strong, fast Slow, steady
Mind Quick, anxious Sharp, irritable Calm, attached
Disease Tendency Neurological, pain Inflammatory, ulcers Respiratory, obesity
Genomic Correlates SLC6A4, COMT CYP2D6, TNF-α FTO, LEP

3.4 Sasang Constitutional Types

Taeyang (太陽人) - Greater Yang

Physical: Well-developed nape, less developed lower body, walks with head forward

Psychological: Creative, progressive, heroic but may be hasty and lack follow-through

Organ Tendency: Strong Lung function, weak Liver function

Prevalence: Very rare (~0.1%)

Taeeum (太陰人) - Greater Yin

Physical: Large frame, thick waist, well-developed lower body

Psychological: Patient, persistent, steady but may be stubborn and greedy

Organ Tendency: Strong Liver function, weak Lung function

Disease Tendency: Metabolic syndrome, hypertension, diabetes

Prevalence: ~50%

Soyang (少陽人) - Lesser Yang

Physical: Well-developed chest, less developed lower body, quick movements

Psychological: Active, sociable, righteous but may be impulsive and hot-tempered

Organ Tendency: Strong Spleen function, weak Kidney function

Disease Tendency: Urinary issues, back problems

Prevalence: ~25%

Soeum (少陰人) - Lesser Yin

Physical: Small, slender frame, well-proportioned but delicate

Psychological: Careful, organized, detailed but may be anxious and introverted

Organ Tendency: Strong Kidney function, weak Spleen function

Disease Tendency: Digestive issues, cold sensitivity

Prevalence: ~25%

3.5 Cross-System Correlations

Research has identified correlations between constitutional types across different systems:

TCM Ayurveda Sasang Common Features
Phlegm-Dampness Kapha Taeeum Obesity tendency, slow metabolism
Yin Deficiency Pitta-Vata Soyang (partial) Heat signs, thin build
Yang Deficiency Vata-Kapha Soeum Cold sensitivity, weak digestion
Qi Deficiency Vata Soeum Fatigue, weak immunity
Important Note: These correlations are approximations. Each system has unique aspects that don't translate directly. The WIA-TRADITIONAL-MEDICINE standard preserves the distinct terminology and concepts of each system while enabling data exchange and cross-referencing.

3.6 Clinical Application of Constitutional Diagnosis

Constitutional diagnosis guides personalized treatment in several ways:

  1. Formula Selection: Choose formulas that address constitutional tendencies
  2. Herb Modification: Add or remove herbs based on constitution
  3. Dosage Adjustment: Constitutionally weak patients may need gentler formulas
  4. Dietary Guidance: Constitution-specific food recommendations
  5. Lifestyle Advice: Exercise, sleep, stress management tailored to constitution
  6. Disease Prevention: Address constitutional weaknesses before disease manifests