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+---
+id: wiki-2026-0508-nutritional-biochemistry
+title: Nutritional Biochemistry
+category: 10_Wiki/Topics
+status: verified
+canonical_id: self
+aliases: [영양 생화학, Nutrient Biochemistry, Metabolic Nutrition]
+duplicate_of: none
+source_trust_level: A
+confidence_score: 0.9
+verification_status: applied
+tags: [biochemistry, nutrition, metabolism, biology, health]
+raw_sources: []
+last_reinforced: 2026-05-10
+github_commit: pending
+tech_stack:
+  language: domain-knowledge
+  framework: biochemistry
+---
+
+# Nutritional Biochemistry
+
+## 매 한 줄
+> **"매 nutrient 는 metabolic substrate + cofactor + signal"**. Nutritional biochemistry 는 macronutrient 와 micronutrient 가 cellular metabolism, gene expression, signaling 에 어떻게 작용하는지 연구. 2026 perspective 에서 personalized nutrition + microbiome interaction + metabolomics 가 frontier.
+
+## 매 핵심
+
+### 매 macronutrient pathways
+- **Carbohydrate**: glycolysis → pyruvate → acetyl-CoA → TCA → ETC. 4 kcal/g.
+- **Lipid**: β-oxidation → acetyl-CoA → TCA. 9 kcal/g. Membrane lipids, eicosanoids.
+- **Protein**: amino acid → transamination → urea / gluconeogenesis. 4 kcal/g.
+
+### 매 micronutrient roles
+- **B-vitamins**: coenzymes (NAD, FAD, CoA, THF, PLP).
+- **Fat-soluble (ADEK)**: signaling (retinoic acid, calcitriol).
+- **Minerals**: cofactors (Mg-ATP, Zn-fingers, Fe-heme), electrolytes.
+
+### 매 응용
+1. Sports nutrition / supplement design.
+2. Disease management (diabetes, NAFLD).
+3. Personalized diet (genotype + microbiome).
+4. Public health policy.
+
+## 💻 패턴
+
+### Basal metabolic rate (Mifflin-St Jeor)
+```python
+def bmr(weight_kg, height_cm, age_y, sex="M"):
+    base = 10*weight_kg + 6.25*height_cm - 5*age_y
+    return base + 5 if sex == "M" else base - 161
+
+def tdee(bmr_val, activity="moderate"):
+    factors = {"sedentary": 1.2, "light": 1.375,
+               "moderate": 1.55, "active": 1.725}
+    return bmr_val * factors[activity]
+```
+
+### Macro split optimization
+```python
+def macro_split(tdee, goal="maintain", body_kg=70):
+    protein_g = body_kg * (1.6 if goal == "cut" else 1.2)
+    p_cal = protein_g * 4
+    fat_cal = tdee * 0.25
+    carb_cal = tdee - p_cal - fat_cal
+    return {"protein_g": protein_g,
+            "fat_g": fat_cal / 9,
+            "carb_g": carb_cal / 4}
+```
+
+### Glycemic load
+```python
+def glycemic_load(food: dict) -> float:
+    return food["gi"] * food["carb_g"] / 100
+# Low <10, medium 11-19, high 20+
+```
+
+### TCA cycle ATP yield
+```python
+def atp_per_glucose():
+    glycolysis = 2
+    nadh_glyc = 2 * 2.5
+    pyruvate_to_acetyl = 2 * 2.5
+    tca_per_acetyl = (3*2.5) + 1.5 + 1
+    tca_total = 2 * tca_per_acetyl
+    return glycolysis + nadh_glyc + pyruvate_to_acetyl + tca_total
+# ≈ 30 ATP / glucose (modern stoichiometry)
+```
+
+### Nitrogen balance
+```python
+def n_balance(protein_intake_g, urea_n_excreted_g, fecal_skin_g=4):
+    n_in = protein_intake_g / 6.25
+    n_out = urea_n_excreted_g + fecal_skin_g
+    return n_in - n_out
+```
+
+### Vitamin D activation cascade
+```python
+def vit_d_activation():
+    return [
+        "7-dehydrocholesterol",
+        "cholecalciferol (D3, skin UVB)",
+        "25-OH-D3 (liver, CYP2R1)",
+        "1,25-(OH)2-D3 (kidney, CYP27B1, calcitriol)",
+        "VDR-RXR transcription factor",
+    ]
+```
+
+## 매 결정 기준
+| 상황 | Approach |
+|---|---|
+| Weight loss | Caloric deficit + protein-priority |
+| Performance | Periodized carb + creatine |
+| T2D management | Low GL + Mediterranean |
+| Deficiency screen | Serum 25-OH-D, B12, ferritin, Mg |
+
+**기본값**: TDEE 기반 + protein floor + micronutrient screen.
+
+## 🔗 Graph
+
+## 🤖 LLM 활용
+**언제**: meal plan template, nutrient interaction summary, label decoding.
+**언제 X**: clinical diagnosis / Rx — RD / MD 필수.
+
+## ❌ 안티패턴
+- **Calorie-only thinking**: hormone / micronutrient 무시.
+- **Single-nutrient hype**: antioxidant / superfood 일반화 — context-free.
+- **Ignoring bioavailability**: total intake ≠ absorbed.
+- **Population stat → individual**: personal genetics / microbiome 무시.
+
+## 🧪 검증 / 중복
+- Verified (Lehninger 8e, Modern Nutrition in Health and Disease 11e, USDA DRI 2024).
+- 신뢰도 A.
+
+## 🕓 Changelog
+| 날짜 | 변경 |
+|---|---|
+| 2026-05-08 | Phase 1 |
+| 2026-05-10 | Manual cleanup — BMR/macro/TCA/Vit-D 패턴 |