In June 2026, the United States Medical Licensing Examination® (USMLE®) program will implement two nutrition-related enhancements that will further highlight the importance of nutrition to health and chronic illness prevention. These updates include: Content measuring knowledge and application of nutrition science will be enhanced across all three Step exams. Performance feedback on the nutrition content area will be included in USMLE score reports for both examinees and medical schools. As with other important content, the USMLE has long tested nutrition content through questions across multiple bodily systems and medical disciplines. The USMLE program is committed to ensuring that the Step exams reflect evidence-based standards for core competencies and principles needed to provide safe and effective patient care. The program regularly reviews and modifies its content outline and test questions in response to evolving evidence and practice guidelines, as well as ongoing curricular changes at U.S. medical schools. Please continue to monitor USMLE.org for program updates. FAQs What nutrition competencies will be measured in the USMLE Step exams? Nutrition content included in the USMLE Step exams will be enhanced to better align with evidence-based competencies including but not limited to those outlined in the 2024 consensus statement Proposed Nutrition Competencies for Medical Students and Physician Trainees published in the Journal of the American Medical Association (JAMA). While not all topics listed will be included in each USMLE Step exam, overall nutrition content coverage is comparable among the various exam forms that will be taken by different examinees for each Step. When will the enhanced nutrition science content appear on the Step exams? The enhanced content measuring the knowledge and application of nutrition science will appear across all three Step exams starting in June 2026. When will score reports include performance feedback on the nutrition content area? USMLE score reports will include performance feedback on the nutrition content area starting on the dates below. Please note that individuals passing Step 1 will not see content area feedback, consistent with current USMLE reporting for individuals passing Step 1. Step 3 score reports: after June 9, 2026 Step 2 CK score reports: no later than July 1, 2026 Step 1 score reports: no later than July 8, 2026 How will the nutrition content for the Step exams be generated? All USMLE content is generated by members of Test Material Development Committees (TMDCs) which develop and review test questions and cases that form the Step exams. The USMLE program is working closely with these individuals, who teach at U.S. medical schools and serve on state medical boards, to generate nutrition content for the Step exams. How will these enhancements influence my preparation for the Step exams? As the USMLE program enhances its emphasis on nutrition, you should not change how you study for the Step exams. Please continue to prepare for each Step exam by studying the content and materials provided by your medical school, and by using the content outlines, content weighting specifications and interactive testing tutorials on USMLE.org. Will these enhancements affect when I receive my score report? No. Exam results will continue to be available two to four weeks after your test date. However, various factors may impact score reporting timelines. As always, when selecting your test date and inquiring about results, you should allow at least eight weeks to receive notification that your score report is available. What is the reason for these enhancements? The upcoming enhancements reflect the evolving emphasis in medical education and clinical practice on the importance of nutrition’s role in chronic disease prevention and its importance to patient health. The USMLE program is committed to ensuring that the Step exams reflect evidence-based standards for core competencies and principles needed to provide safe and effective patient care. How will I interpret my score report with this update? This change includes an additional category on the score report for nutrition content. For more information on interpreting your score report, please visit the USMLE website and review the notes and guidance reported on your score report. Will nutrition questions affect my Step exam score more than before? No. The overall scoring of the Step exams is not changing. Nutrition content does not receive separate weighting that can disproportionately affect your score. It remains integrated into system- and discipline-based questions, however, just as it is currently. Is the content outline changing with these enhancements? As with other important content, the USMLE has long tested nutrition content through questions across multiple bodily systems and medical disciplines. Nutrition-related knowledge and skills will continue to be assessed within questions across body systems and medical disciplines, allowing examinees to demonstrate their knowledge of how nutrition influences health, disease, and clinical decision-making in medicine. The USMLE Content Outline is an important resource that includes a complete description of the concepts and principles examinees are responsible for knowing for the USMLE Step exams. The USMLE Content Outline will not change with these enhancements. Content weighting for each Step exam can be found on USMLE.org and is represented on your score report. How will these changes affect USMLE co-sponsor NBME’s Subject Examinations and Self-Assessments? As is standard practice, NBME’s Comprehensive Subject Examinations and Self-Assessments—which are designed to help examinees prepare and assess readiness for the USMLE—are continuously revised to remain consistent with the Step exams. Exam content and reporting on these assessments and tools will be updated to reflect the nutrition content enhancements. What does the enhanced nutrition content on the USMLE Step exams mean for examinees and medical schools? The enhanced nutrition content on the USMLE Step exams is part of an ongoing effort to ensure that the assessments continue to reflect the knowledge and skills physicians need for patient care. Recent analyses show that this enhancement has not resulted in meaningful changes in overall examinee or school performance outcomes. Analyses of content area feedback, as reported on examinee score reports, across all three USMLE Step exams indicate that the vast majority of examinees perform the same on nutrition content as they do overall, with very small percentages performing higher or lower. Similar analyses for LCME-accredited institutions show minimal impact at the school level, with the vast majority of schools’ students performing comparably on nutrition to the Step exam as a whole, and to other students from LCME-accredited institutions testing for the first time. These findings suggest that the expansion of nutrition content is being integrated smoothly into the exams and that the enhanced content does not disproportionately advantage or disadvantage learners. can you collect info from jama a give me a detailed content what i should study and what test makers can ask in usmle step 1.
nutrition competencies medical students physician trainees consensus statement
JAMA 2024 "Proposed Nutrition Competencies for Medical Students and Physician Trainees" consensus statement full content
PMID: 39348126
JAMA Network Open 2024 Eisenberg nutrition competencies medical students full list domains USMLE
PMID: 39348126
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USMLE Step 1 Nutrition: Complete Study Guide (June 2026 Enhancement)
What the JAMA Paper Actually Says
Competency 35 — Demonstrates knowledge of the functions of essential nutrients (97% consensus) Competency 36 — Demonstrates knowledge of the principles of a healthy balanced diet in accordance with national nutrition guidelines (95% consensus)
- Evidence-based, culturally sensitive nutrition recommendations
- Screening for food insecurity
- Multidisciplinary approach to nutrition care
- Pathophysiology leading to metabolic syndrome or malnutrition ← most testable on Step 1
- Nutritional status assessment (diet history, anthropometrics, labs)
- Non-judgmental diet/lifestyle conversation
- Knowledge of nutritional content of foods — macronutrients and micronutrients ← core Step 1
- Integration of national nutrition guidelines
- Public health nutrition and social determinants of health
- Sensitivity to socioeconomic/cultural factors affecting food choices
DOMAIN 1: Foundational Nutrition Biochemistry (Highest-Yield for Step 1)
1A. Macronutrients — Energy Metabolism
| Macronutrient | Calories/gram | Primary function | Storage form |
|---|---|---|---|
| Carbohydrates | 4 kcal/g | Primary fuel (brain, RBCs) | Glycogen (liver, muscle) |
| Proteins | 4 kcal/g | Structural, enzymatic, immune | Muscle mass |
| Fats | 9 kcal/g | Energy reserve, hormones, membranes | Triglycerides (adipose) |
| Alcohol | 7 kcal/g | No essential function | N/A |
- The brain requires ~120 g glucose/day; during starvation it shifts to ketone bodies (acetoacetate, β-hydroxybutyrate)
- Respiratory quotient (RQ): carbohydrate = 1.0, fat = 0.7, protein = 0.8; pure fat oxidation lowers RQ
- Nitrogen balance: negative in catabolism (trauma, sepsis, cancer), positive in anabolism (growth, pregnancy)
- Essential amino acids mnemonic: PVT TIM HaLL (Phenylalanine, Valine, Threonine, Tryptophan, Isoleucine, Methionine, Histidine, Arginine[conditionally], Leucine, Lysine)
- Essential fatty acids: linoleic acid (ω-6) and α-linolenic acid (ω-3) — cannot be synthesized; deficiency → dermatitis, poor wound healing, impaired immunity
1B. Vitamins — The Highest-Yield Table for Step 1
Fat-Soluble Vitamins (A, D, E, K) — stored in fat, risk of toxicity
| Vitamin | Key Functions | Deficiency | Toxicity | Classic Step 1 Clue |
|---|---|---|---|---|
| A (retinol) | Vision (rhodopsin), epithelial integrity, immune function | Night blindness → xerophthalmia → Bitot spots → keratomalacia | Teratogenic (pseudotumor cerebri, liver damage) | Child in developing country with night blindness; isotretinoin pregnancy contraindication |
| D (calciferol) | Calcium/phosphate absorption (intestine), bone mineralization | Rickets (children), osteomalacia (adults); hypocalcemia, tetany | Hypercalcemia, hypercalciuria, nephrolithiasis | Breastfed infant not in sunlight; CKD patient with bone pain |
| E (tocopherol) | Antioxidant (protects cell membranes from lipid peroxidation) | Hemolytic anemia in premature infants; spinocerebellar ataxia; peripheral neuropathy | Inhibits platelet aggregation, anticoagulant effect | Premature neonate with hemolysis; ataxia in fat malabsorption |
| K (phylloquinone) | Cofactor for γ-carboxylation of clotting factors II, VII, IX, X, protein C, S | Bleeding diathesis; elevated PT/INR; hemorrhagic disease of the newborn | Rare; synthetic K3 (menadione) causes hemolysis | Newborn given IM vitamin K; warfarin mechanism; ↑PT, normal PTT |
Water-Soluble Vitamins — not stored (except B12), excreted in urine
| Vitamin | Coenzyme form | Key Functions | Deficiency | Classic Step 1 Clue |
|---|---|---|---|---|
| B1 (Thiamine) | TPP (thiamine pyrophosphate) | Pyruvate dehydrogenase, α-ketoglutarate dehydrogenase, transketolase | Beriberi (wet = HF/edema; dry = peripheral neuropathy); Wernicke-Korsakoff (confusion, ataxia, ophthalmoplegia → confabulation) | Alcoholic with confusion + ataxia; give thiamine BEFORE glucose |
| B2 (Riboflavin) | FAD, FMN | Oxidative reactions (electron carrier) | Cheilosis, angular stomatitis, corneal vascularization, magenta tongue | "The 2 C's and a C": Cheilosis, Corneal vascularization, Conjunctivitis |
| B3 (Niacin) | NAD+, NADP+ | Redox reactions; >200 enzymatic reactions | Pellagra: 4 D's — Dermatitis (sun-exposed), Diarrhea, Dementia, Death | Carcinoid (tryptophan diverted → 5-HT); Hartnup disease (tryptophan malabsorption); Isoniazid use |
| B5 (Pantothenic acid) | CoA | Fatty acid synthesis/oxidation, TCA cycle | Rare; "burning feet" syndrome, dermatitis | "Pantothenate = Panto everything" — involved in CoA |
| B6 (Pyridoxine) | PLP (pyridoxal phosphate) | Transamination, decarboxylation; heme synthesis (ALA synthase); serotonin/dopamine synthesis | Peripheral neuropathy, sideroblastic anemia, seborrheic dermatitis | Isoniazid (INH) → B6 antagonist → peripheral neuropathy → give B6 supplementation |
| B7 (Biotin) | Biotin | Carboxylation reactions (pyruvate carboxylase, acetyl-CoA carboxylase) | Dermatitis, enteritis, alopecia | Raw egg whites (avidin binds biotin); total parenteral nutrition without supplementation |
| B9 (Folate) | Tetrahydrofolate (THF) | One-carbon transfer; purine/thymidine synthesis (DNA) | Megaloblastic anemia (no neuro symptoms); neural tube defects in pregnancy | Give BEFORE pregnancy; Methotrexate/trimethoprim inhibit DHF reductase; ↑homocysteine |
| B12 (Cobalamin) | Methylcobalamin, adenosylcobalamin | Methionine synthesis (requires folate); myelin synthesis; odd-chain fatty acid catabolism | Megaloblastic anemia + subacute combined degeneration (dorsal/lateral column demyelination); ↑methylmalonic acid + homocysteine | Strict vegans; pernicious anemia (anti-IF antibodies); Crohn's (terminal ileum), gastric bypass; ↑MMA distinguishes from folate deficiency |
| C (Ascorbate) | — | Collagen synthesis (hydroxylation of Pro/Lys); antioxidant; iron absorption; wound healing; catecholamine synthesis | Scurvy: perifollicular hemorrhage, corkscrew hairs, gingival bleeding, poor wound healing, hemarthroses | Sailor/soldier with poor diet; "scurvy = bloody gums + perifollicular hemorrhage" |
1C. Essential Minerals and Trace Elements
| Mineral | Key Function | Deficiency | Toxicity/Excess | Step 1 clue |
|---|---|---|---|---|
| Iron | Hemoglobin, myoglobin, cytochromes, electron transport | Microcytic hypochromic anemia; ↓ferritin, ↑TIBC, ↓serum iron | Hemochromatosis (HFE gene); bronze diabetes | Menstruating woman with fatigue; spoon nails (koilonychia) |
| Calcium | Bone/teeth, muscle contraction, nerve conduction, clotting | Hypocalcemia: tetany, Chvostek/Trousseau signs, seizures, QT prolongation | Hypercalcemia: stones, bones, groans, moans | PTH/Vitamin D axis; milk-alkali syndrome |
| Phosphate | Bone, ATP, 2,3-BPG, DNA backbone | Refeeding syndrome (phosphate driven into cells), rickets | Chronic kidney disease → hyperphosphatemia → renal osteodystrophy | ICU patient starting feeds after starvation → hypophosphatemia |
| Magnesium | Cofactor for >300 enzymes; ATP stability; neuromuscular | Hypomagnesemia: arrhythmias, tetany, refractory hypocalcemia/hypokalemia | Hypermagnesemia: loss of reflexes, respiratory arrest | Alcoholic, diuretic use, or diarrhea; "magnesium first" for torsades de pointes |
| Zinc | Wound healing, immune function, taste/smell, insulin storage | Delayed wound healing, hypogonadism, anosmia/ageusia, growth retardation, immune dysfunction, perioral rash | Rare | Acrodermatitis enteropathica (AR); total parenteral nutrition |
| Iodine | Thyroid hormone synthesis | Hypothyroidism, goiter, cretinism (cognitive delay in neonates) | Iodine-induced hyperthyroidism (Jod-Basedow); Wolff-Chaikoff effect | Endemic goiter; pregnant woman in iodine-deficient area |
| Selenium | Glutathione peroxidase (antioxidant) | Keshan disease (dilated cardiomyopathy); Kashin-Beck disease (osteoarthritis) | Selenosis: hair/nail loss, garlic breath, neurological symptoms | China/Keshan province; TPN patient |
| Copper | Ceruloplasmin, cytochrome c oxidase, lysyl oxidase, dopamine β-hydroxylase | Menkes disease (X-linked): kinky hair, hypotonia, intellectual disability, "steel wool" hair | Wilson disease: liver + neuropsychiatric + Kayser-Fleischer rings | Wilson = copper accumulation; Menkes = copper transport defect |
| Fluoride | Hydroxyapatite → fluorapatite (tooth/bone strengthening) | Dental caries | Fluorosis: mottled/discolored teeth | Community water fluoridation; excessive fluoride supplementation |
DOMAIN 2: Protein-Energy Malnutrition (PEM)
Marasmus vs. Kwashiorkor
| Feature | Marasmus | Kwashiorkor |
|---|---|---|
| Cause | Severe deficiency of both protein AND calories | Predominantly protein deficiency (adequate calorie intake) |
| Appearance | Wasted, "skin and bones," no edema | Edematous (hypoalbuminemia → ↓oncotic pressure); "pot belly" |
| Edema | Absent | Present |
| Albumin | Normal or low-normal | Markedly low |
| Hair changes | Thin, sparse | "Flag sign" (alternating dark/light bands); easily pluckable, reddish discoloration |
| Fatty liver | Absent | Present (hepatic steatosis from ↓apolipoprotein synthesis) |
| Immunity | Impaired | Severely impaired |
| Skin changes | Minimal | "Crazy paving" dermatosis; hyperpigmentation then desquamation |
| Pathology (Robbins) | Loss of body fat + muscle atrophy | Peripheral edema; fatty liver; growth failure |
DOMAIN 3: Nutrition-Related Diseases and Pathophysiology
Obesity and Metabolic Syndrome
- Waist circumference >102 cm (M) or >88 cm (F)
- Triglycerides ≥150 mg/dL
- HDL <40 mg/dL (M) or <50 mg/dL (F)
- Blood pressure ≥130/85 mmHg
- Fasting glucose ≥100 mg/dL
- Leptin: satiety hormone, ↑in obesity (leptin resistance)
- Adiponectin: anti-inflammatory, insulin-sensitizing; ↓ in obesity
- Ghrelin: hunger hormone, secreted by stomach
- Orexin/hypocretin: promotes wakefulness/feeding; deficient in narcolepsy
Type 2 Diabetes and Diet
- Dietary pattern: high glycemic index diet → insulin resistance → T2DM
- 90% of T2DM associated with overweight/obesity
- Mediterranean diet and DASH diet reduce cardiovascular risk
Cardiovascular Disease
- Saturated fat → ↑LDL → atherosclerosis
- Trans fats → ↑LDL + ↓HDL (worst profile)
- ω-3 fatty acids (EPA, DHA) → ↓triglycerides, anti-inflammatory
- Dietary cholesterol has less impact than saturated fat on LDL
Non-Alcoholic Fatty Liver Disease (NAFLD/MASLD)
- Driven by insulin resistance and metabolic syndrome
- High-fructose corn syrup particularly implicated (drives de novo lipogenesis)
Nutrition in Specific GI Conditions
- Celiac disease: gluten (gliadin) → immune-mediated villous atrophy → malabsorption of fat-soluble vitamins (A, D, E, K), iron, folate, calcium
- Crohn's disease: terminal ileum involvement → B12 malabsorption, fat-soluble vitamin deficiency
- Short bowel syndrome: malabsorption, need for TPN
- Pernicious anemia: autoimmune destruction of parietal cells → no intrinsic factor → B12 malabsorption
DOMAIN 4: Pathological States Affecting Nutrient Absorption
| Condition | Affected Nutrients | Mechanism |
|---|---|---|
| Celiac disease | Fat-soluble vitamins, iron, folate, Ca | Villous atrophy (jejunum) |
| Crohn's (terminal ileum) | B12, fat-soluble vitamins, bile acids | Inflammation/resection of ileum |
| Gastric bypass/gastrectomy | B12, iron, calcium, thiamine | ↓intrinsic factor; bypassed duodenum |
| Pancreatic insufficiency | Fat-soluble vitamins (A, D, E, K), fat, protein | ↓lipase, protease, amylase |
| Cholestasis | Fat-soluble vitamins | ↓bile acids → fat malabsorption |
| Alcoholism | B1, B2, B3, folate, zinc, magnesium | Poor intake + impaired absorption/metabolism |
| Chronic kidney disease | Vitamin D (↓activation), calcium, phosphate | ↓1α-hydroxylase activity → ↓active vitamin D |
| Cystic fibrosis | Fat-soluble vitamins, fat, protein | Pancreatic exocrine insufficiency |
| HIV/AIDS | Multiple | Malabsorption, poor intake, drug interactions |
DOMAIN 5: Drug-Nutrient Interactions
| Drug | Nutrient affected | Mechanism | Clinical result |
|---|---|---|---|
| Isoniazid (INH) | Vitamin B6 (pyridoxine) | Competitive inhibitor of PLP | Peripheral neuropathy → prevent with B6 supplementation |
| Methotrexate, Trimethoprim | Folate | Inhibit dihydrofolate reductase | Megaloblastic anemia → give leucovorin rescue |
| Warfarin | Vitamin K | Blocks γ-carboxylation of clotting factors | Dietary vitamin K (green leafy veg) antagonizes warfarin |
| Statins | CoQ10 (ubiquinone) | Block HMG-CoA reductase → ↓menadione | Myopathy (CoQ10 is in mitochondrial electron transport) |
| Phenytoin, Phenobarbital | Vitamin D, folate | Enzyme induction → accelerated vitamin D metabolism | Osteomalacia, megaloblastic anemia |
| Colchicine, Metformin | Vitamin B12 | Impair ileal absorption of B12-IF complex | Megaloblastic anemia |
| Cholestyramine | Fat-soluble vitamins (A, D, E, K) | Binds bile acids → fat malabsorption | Deficiency of fat-soluble vitamins |
| Proton pump inhibitors | B12, magnesium, iron | ↓gastric acid → impair absorption | B12 deficiency with long-term use |
| Alcohol | Thiamine, folate, zinc, magnesium | Multiple mechanisms | Wernicke, megaloblastic anemia, neuropathy |
DOMAIN 6: Nutrition Across the Lifespan
Pregnancy
- Folate (400–800 mcg/day) starting before conception → prevents neural tube defects (spina bifida, anencephaly)
- Iron: requirements double; deficiency → iron deficiency anemia of pregnancy
- Iodine: critical for fetal brain development
- DHA (ω-3): fetal brain and retinal development
- Alcohol: no safe amount; fetal alcohol spectrum disorder (FASD)
- Avoid: unpasteurized products (Listeria), high-mercury fish, raw meat/eggs
Infancy (0-12 months)
- Breast milk is the gold standard (IgA, lactoferrin, growth factors, ideal macros)
- Vitamin D supplementation for all breastfed infants (400 IU/day) — breast milk is low in D
- Vitamin K given IM at birth — newborns have minimal gut flora and low stores
- Iron: formula-fed infants get iron-fortified formula; breastfed infants need iron supplement after 4 months
- Do NOT give honey to infants < 12 months (Clostridium botulinum spores)
- Do NOT give cow's milk < 12 months (low in iron, can cause GI blood loss)
Childhood and Adolescence
- Calcium and vitamin D: critical for bone density accrual (peak bone mass at ~30 years)
- Iron deficiency: most common nutritional deficiency worldwide; particularly in adolescent girls after menarche
- Obesity epidemic: insulin resistance, metabolic syndrome beginning in adolescence
Elderly
- ↓absorption of B12 (achlorhydria → impaired protein-bound B12 liberation)
- ↑risk of vitamin D deficiency (↓sun exposure, ↓synthesis in skin, ↓renal activation)
- Sarcopenia: protein requirements actually increase in elderly (1.0–1.2 g/kg/day vs. 0.8 g/kg/day in young adults)
- ↓taste/smell → ↓appetite → malnutrition risk
DOMAIN 7: Food Insecurity and Social Determinants of Health
- Food deserts: low-income neighborhoods lack access to fresh produce → ↑obesity, diabetes, cardiovascular disease
- SNAP, WIC: federal nutrition assistance programs
- Food insecurity defined as limited access to adequate food for active, healthy living
- ~12.8% of US households food insecure (2022)
- Food insecurity → chronic disease risk; manifestation of health inequity
DOMAIN 8: Enteral and Parenteral Nutrition
- "If the gut works, use it" — enteral preferred over parenteral
- Enteral nutrition (tube feeding): preserves gut mucosa integrity, reduces bacterial translocation
- Total Parenteral Nutrition (TPN): for when GI tract cannot be used; complications include:
- Line sepsis (most common cause of death)
- Fatty liver (hepatic steatosis)
- Refeeding syndrome (if not introduced gradually)
- Trace element deficiencies (zinc, selenium, copper, chromium) with long-term use
- Hyperglycemia
- Metabolic bone disease
- Essential fatty acid deficiency in TPN without lipid emulsion → scaly dermatitis, hair loss
DOMAIN 9: Eating Disorders
| Disorder | Key features | Nutritional consequences |
|---|---|---|
| Anorexia Nervosa | Restrictive, BMI <17.5, distorted body image, fear of weight gain | Bradycardia, lanugo, osteoporosis, low estrogen, amenorrhea, electrolyte disturbances, refeeding syndrome risk |
| Bulimia Nervosa | Binge-purge, normal BMI | Hypokalemia, hypochloremia, metabolic alkalosis (from vomiting HCl), Russell's sign, dental erosion, parotid hypertrophy |
| Binge Eating Disorder | Binge without purging | Obesity, metabolic syndrome |
DOMAIN 10: Public Health Nutrition Guidelines
- Emphasis on dietary patterns, not individual nutrients
- Mediterranean diet and DASH diet have the strongest evidence for CVD prevention
- Limit: saturated fat (<10% calories), added sugars (<10% calories), sodium (<2300 mg/day), alcohol
- Eat: fruits, vegetables, whole grains, lean protein, low-fat dairy, legumes, nuts
- RDA (Recommended Dietary Allowance): meets needs of 97–98% of healthy individuals
- EAR (Estimated Average Requirement): meets needs of 50% of individuals
- UL (Tolerable Upper Intake Level): maximum before adverse effects
- AI (Adequate Intake): used when RDA cannot be determined
- Underweight: <18.5
- Normal: 18.5–24.9
- Overweight: 25–29.9
- Obese class I: 30–34.9; class II: 35–39.9; class III: ≥40
What Step 1 Test Questions Will Actually Look Like
Pattern 1: Classic Deficiency Vignette
Pattern 2: Alcoholism + Vitamin Deficiency
Pattern 3: Malabsorption + Vitamin Deficiency
Pattern 4: Drug-Nutrient Interaction
Pattern 5: Pregnancy/Neural Tube Defects
Pattern 6: Metabolic Syndrome Pathophysiology
Pattern 7: Refeeding Syndrome
Pattern 8: TPN Complication
The 12 Identified Gaps (Emerging USMLE Territory)
- GLP-1 agonists (semaglutide, liraglutide) in combination with diet/lifestyle — obesity pharmacotherapy
- Diet, food systems, environment, and planetary health
- Billing for nutrition-related services (less relevant for Step 1)
- Eating with others / social eating effects on health
- Healthy food environments in healthcare settings
- Evidence-based dietary supplements guidance
- Food assistance programs (SNAP, WIC, "food is medicine" services)
- Making healthy choices the default across populations
- Nutrition requirements throughout the lifecycle
- Optimizing food history solicitation
- AI in nutrition counseling
- Healthy beverage consumption (sugary drinks, alcohol, water)
Priority Study Checklist for Step 1
- All water-soluble vitamins: coenzyme form, function, deficiency disease, classic vignette
- All fat-soluble vitamins: absorption mechanism, deficiency, toxicity
- Kwashiorkor vs. Marasmus: edema, albumin, fatty liver, hair changes
- Metabolic syndrome: criteria, insulin resistance mechanism, adipokines
- Refeeding syndrome: which electrolyte, why, when
- Key drug-nutrient interactions: INH/B6, methotrexate/folate, warfarin/vitamin K, phenytoin/vitamin D
- Malabsorption syndromes and which nutrients each affects
- Iron deficiency anemia vs. B12/folate megaloblastic anemia: distinguish by MCV, MMA, homocysteine
- Wernicke-Korsakoff: give thiamine before glucose
- Prenatal nutrition: folate (NTD prevention), iron, iodine, DHA, avoid alcohol
- Vitamin B12 vs. folate deficiency: why B12 causes neuro (myelin) and folate does not
- Rickets vs. osteomalacia: same disease (↓vitamin D), different age of presentation
- Scurvy mechanism: proline/lysine hydroxylation failure → collagen triple helix unstable
- Pellagra: tryptophan → niacin pathway; why carcinoid and Hartnup cause pellagra-like syndrome
- Biotin deficiency: avidin in raw eggs; carboxylase enzymes
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