3.2 Vitamins, Minerals & Nutritional Deficiencies
Key Takeaways
- Fat-soluble vitamins A, D, E, K are stored and can accumulate; water-soluble B-complex and C are less stored (except B12) and deficiency appears sooner with poor intake or malabsorption.
- Vitamin C deficiency (scurvy) causes gingival bleeding, poor wound healing, and tooth mobility via failed collagen hydroxylation; vitamin D deficiency impairs Ca/PO₄ absorption and mineralization (rickets/osteomalacia).
- B-vitamin deficiencies produce characteristic oral mucosal signs: angular cheilitis, glossitis, burning mouth patterns (B2, B3, B6, B12, folate), while B12/folate deficiency also drives megaloblastic anemia.
- Vitamin A is essential for vision and epithelial differentiation; excess is teratogenic, and deficiency causes night blindness and keratinization disorders that can involve oral mucosa.
- Calcium and phosphate build hydroxyapatite; iron deficiency causes anemia and atrophic glossitis/angular cheilitis patterns; vitamin K is required for clotting-factor carboxylation—critical before invasive dental surgery.
3.2 Vitamins, Minerals & Nutritional Deficiencies
Quick Answer: Know each nutrient’s biochemical role, oral/systemic deficiency signs, and toxicity or surgical relevance. Vitamin C → collagen; vitamin D + Ca/PO₄ → mineralized tissues; B vitamins → energy metabolism and mucosa; vitamin K → clotting; vitamin A → epithelium/vision; iron → hemoglobin and epithelial health. AFK loves classic oral manifestations more than obscure biochemical side pathways.
Nutrition items appear under applied biomedical sciences and reappear in oral medicine, pediatrics, geriatrics, and surgery (bleeding, healing, developmental defects). Learn tables, then practice “photo/stem → nutrient” recognition.
Fat-Soluble vs Water-Soluble Vitamins
| Class | Vitamins | Storage | Deficiency tempo | Toxicity risk |
|---|---|---|---|---|
| Fat-soluble | A, D, E, K | Liver/adipose (variable) | Slower if stores present | Higher (especially A, D) |
| Water-soluble | B-complex, C | Limited (B12 stored in liver for years) | Often faster with poor diet | Lower (exceptions exist with megadoses) |
Fat-soluble vitamins require bile micelles for absorption—cholestasis, fat malabsorption, orlistat, short gut can cause deficiencies. Water-soluble vitamins are lost in cooking water and with chronic alcoholism, dialysis, or very poor diets.
Vitamin A (Retinoids)
Roles: vision (rhodopsin cycle), epithelial cell differentiation, immune function, embryonic development.
| State | Key features | Oral/dental notes |
|---|---|---|
| Deficiency | Night blindness, xerophthalmia, Bitot spots, keratinizing metaplasia, infection risk | Dry, hyperkeratotic mucosa possible; impaired barrier function |
| Excess / toxicity | Teratogenicity, liver toxicity, bone pain, dry skin, ↑ ICP | Avoid excess in pregnancy; isotretinoin-level teratogenicity is high-stakes knowledge |
Dietary sources: liver, dairy, eggs; provitamin A carotenoids in orange/green vegetables. AFK angle: epithelium quality and teratogenic counseling more than detailed isomer chemistry.
B-Complex Vitamins (Oral Mucosa High Yield)
B vitamins are coenzymes in carbohydrate, fat, and protein metabolism. Deficiencies commonly present with atrophic glossitis, angular cheilitis (angular stomatitis), burning mouth, and mucosal atrophy—often overlapping, so think “B-complex pattern” then refine.
| Vitamin | Coenzyme / role (exam level) | Deficiency syndrome & oral signs |
|---|---|---|
| B1 Thiamine | Decarboxylation (e.g., PDH) | Beriberi; Wernicke–Korsakoff (alcohol); nonspecific oral—know systemic |
| B2 Riboflavin | FAD/FMN | Angular cheilitis, glossitis, magenta tongue, seborrheic dermatitis |
| B3 Niacin | NAD/NADP | Pellagra: diarrhea, dermatitis, dementia; scarlet/smooth tongue, stomatitis |
| B6 Pyridoxine | Transamination etc. | Glossitis, cheilitis; drug interactions (isoniazid) |
| B9 Folate | One-carbon transfers, DNA synthesis | Megaloblastic anemia; glossitis; neural tube defects if deficient in pregnancy |
| B12 Cobalamin | Methionine synthase / methylmalonyl-CoA mutase | Megaloblastic anemia + neurologic changes; burning tongue, glossitis; pernicious anemia (IF lack) |
Folate vs B12: both cause megaloblastic anemia and oral epithelial atrophy, but B12 deficiency adds neuropathy (subacute combined degeneration risk). Giving folate alone can improve anemia while allowing neurologic damage to progress—classic teaching point.
Angular cheilitis differential (nutrition vs local): iron deficiency, B2/B3/B6/B12, ill-fitting dentures with candidiasis, saliva pooling at commissures. Do not assume pure vitamin deficiency without context.
Vitamin C (Ascorbic Acid)
Role: cofactor for collagen prolyl/lysyl hydroxylases; antioxidant; enhances non-heme iron absorption.
Deficiency — scurvy:
- Swollen, boggy, bleeding gingiva; petechiae; poor wound healing
- Tooth mobility from compromised PDL/collagen support (historical descriptions)
- Follicular hyperkeratosis, corkscrew hairs, impaired immunity
- Risk groups: severely restricted diets, food insecurity, some elderly or institutionalized patients
Biochemical link (from 3.1): without hydroxylation, collagen triple helix is unstable → weak connective tissue and fragile capillaries → bleeding gingiva.
Vitamin C is water-soluble; excess usually causes GI upset rather than severe toxicity, but megadoses are unnecessary for dental healing marketing claims.
Vitamin D, Calcium, and Phosphate
Vitamin D
Pathway recall: skin (UV) / diet → cholecalciferol → hepatic 25-OH vitamin D → renal 1,25-(OH)₂ (calcitriol), the active hormone.
Actions of calcitriol: increases intestinal absorption of Ca²⁺ and phosphate; supports bone mineralization when minerals are available; interacts with PTH axis (physiology chapter).
| Condition | Setting | Oral/skeletal relevance |
|---|---|---|
| Rickets | Children, deficient mineralized osteoid | Delayed eruption, enamel hypoplasia risk, skeletal deformities |
| Osteomalacia | Adults | Bone pain, fracture risk; impaired mineralization |
| CKD | Failed 1α-hydroxylation | Secondary hyperparathyroidism, renal osteodystrophy |
| Toxicity | Excess supplementation | Hypercalcemia, soft-tissue calcification risk |
Calcium and phosphate
- Building blocks of hydroxyapatite Ca₁₀(PO₄)₆(OH)₂
- Serum Ca²⁺ tightly regulated by PTH, calcitriol, calcitonin (see physiology)
- Dietary calcium: dairy, fortified foods, some greens; phosphate widely available in diet/protein foods
- Hypocalcemia: neuromuscular irritability (tetany, Chvostek/Trousseau); dental development defects if early and severe
- Hypercalcemia: “stones, bones, groans, psychiatric overtones”; may reflect hyperparathyroidism with oral radiographic bone changes
Dental development: adequate Ca/PO₄/vitamin D supports mineralization of teeth and jaws; deficiency periods during amelogenesis/dentinogenesis can leave permanent hypoplastic/hypomineralized defects.
Vitamin K and Vitamin E
Vitamin K
Role: γ-carboxylation of clotting factors II, VII, IX, X and proteins C/S (and bone proteins like osteocalcin conceptually).
| Issue | Clinical dental relevance |
|---|---|
| Deficiency | Bleeding tendency, ↑ PT/INR |
| Causes | Fat malabsorption, biliary obstruction, broad-spectrum antibiotics (reduced gut bacteria synthesis), newborns (classic) |
| Warfarin | Antagonizes vitamin K cycle |
Sources: leafy greens (K1); gut flora (K2 contributions). AFK: link vitamin K → clotting → surgical bleeding risk.
Vitamin E
Antioxidant protecting membrane lipids. Deficiency rare (fat malabsorption, genetic); excess may potentiate bleeding with anticoagulants—know as a secondary bleeding-risk nutrient rather than a primary oral-syndrome vitamin.
Iron and Other Minerals
Iron
Role: hemoglobin/myoglobin O₂ binding; cytochromes in ETC.
Deficiency (most common anemia worldwide):
- Microcytic hypochromic anemia: fatigue, pallor, reduced O₂ delivery
- Oral: atrophic glossitis, angular cheilitis, mucosal atrophy, sometimes burning sensation; Plummer–Vinson association (esophageal webs, iron deficiency, dysphagia) in classic teaching
- Risk: blood loss (menstruation, GI bleed), poor intake, increased demand (pregnancy)
Excess: hemochromatosis—systemic iron overload (not a classic primary oral exam focus).
Other AFK-relevant minerals
| Mineral | Role | Deficiency / note |
|---|---|---|
| Zinc | Taste, immunity, wound healing, enzyme cofactor | Hypogeusia/dysgeusia, impaired healing; acrodermatitis enteropathica (severe genetic) |
| Fluoride | Apatite stabilization (3.1) | Caries risk if inadequate exposure; fluorosis if excess in development |
| Iodine | Thyroid hormone synthesis | Goiter, hypo/hyperthyroid consequences |
| Magnesium | Enzyme cofactor, bone | Neuromuscular irritability when low; common in malnutrition/alcohol |
| Copper | Lysyl oxidase (collagen cross-link), ferroxidases | Rare; connects to collagen strength |
Protein–Energy and General Nutrition for Healing
Beyond single vitamins:
- Severe protein deficiency impairs wound healing, immune response, and periodontal repair capacity
- Uncontrolled diabetes is a metabolic nutrition disease with high AFK yield for infection, healing, and periodontal severity—even though it is endocrine, dietary carbohydrate control is central
- Eating disorders / acidic diet patterns: enamel erosion (perimylolysis in bulimia), caries risk, soft-tissue trauma—nutrition behavior with hard-tissue chemistry consequences
- Xerostomia + poor diet (high frequency sugar): catastrophic caries risk in elderly and irradiated patients
Pregnancy and Developmental Nutrition (High-Yield Cluster)
| Nutrient issue | Developmental concern |
|---|---|
| Folate deficiency | Neural tube defects; counsel periconceptional folate |
| Vitamin A excess | Teratogenicity |
| Severe vitamin D/Ca deficits | Maternal–fetal mineral stress; enamel/skeletal risks |
| Alcohol (not a vitamin) | Fetal alcohol spectrum; craniofacial anomalies |
| Tetracycline (drug, not nutrient) | Tooth discoloration if given in formation years—classic “avoid in pregnancy/young children” |
AFK Pattern Recognition Table
| Oral / systemic clue | First nutrient thoughts |
|---|---|
| Bleeding swollen gingiva + poor diet + petechiae | Vitamin C (scurvy) |
| Angular cheilitis + glossitis + anemia | Iron, B2, B12, folate |
| Glossitis + neuropathy + megaloblastic anemia | B12 |
| Glossitis + megaloblastic anemia without neuropathy | Folate (still rule out B12) |
| Night blindness + keratinization | Vitamin A |
| Rickets / osteomalacia / hypomineralization context | Vitamin D, Ca, PO₄ |
| Elevated surgical bleeding + ↑ PT, malabsorption | Vitamin K |
| Dysgeusia + poor healing | Zinc (among other causes) |
Study Strategy
- Memorize one biochemical role and two clinical signs per major vitamin/mineral
- Separate fat- vs water-soluble storage/toxicity behavior
- Drill folate vs B12 and scurvy collagen mechanism
- Connect Ca/PO₄/vitamin D/PTH as one axis, not four isolated facts
- Always ask: does this stem suggest malabsorption, alcohol, vegan diet without B12, pregnancy, CKD, or anticoagulant use?
Nutrient biochemistry is the bridge from pathways in 3.1 to the soft-tissue and hematologic findings you will diagnose across oral medicine items.
A patient with a severely restricted diet presents with swollen, bleeding gingiva, petechiae, and delayed wound healing. Impaired activity of which process best explains the oral findings?
Which pair correctly matches a nutrient deficiency with a highly characteristic finding?
Folate and vitamin B12 deficiencies both may cause megaloblastic anemia and glossitis. Which additional feature most strongly points to vitamin B12 deficiency rather than isolated folate deficiency?
Active vitamin D (calcitriol) increases serum calcium primarily by: