Beyond the Diagnosis: A Clinical Framework for Assessing Micronutrient Deficiency in High-Risk Care

June 16, 2026 Dick Benson 2026 AIC 0

Layth Tumah, MD, ABFM, DABOM, DiABLM, FMCP-M; James Carter, MD, FACC, FSVM, IFMCP, RPVI; Ramona Wallace, DO, IFMCP; Ashley Siuda, RD, LD, IFNCP

 

Layth Tumah, MD, ABFM, DABOM, DiABLM, FMCP-M, Staff Physician; James Carter, MD, FACC, FSVM, IFMCP, RPVI, Vice Chair, Clinical Services, Wellness and Preventive Medicine; Program Director for Functional Medicine; Ramona Wallace, DO, IFMCP, Staff physician; Ashley, Siuda, RD, LD, IFNCP, Registered Dietitian; Cleveland Clinic Foundation, Cleveland, OH, USA.

 

Corresponding author: Layth Tumah, MD

E-mail: TUMAHL@ccf.org

 

Keywords: Micronutrient deficiency, Food-first approach, High-risk populations, Clinical framework.

 

 

Introduction

Micronutrient deficiencies affect more than 2 billion individuals worldwide,1 and rank among the leading risk factors for disability.2 Despite this burden, nutritional assessments are often delayed until conventional treatments fail. Deficiencies commonly manifest as fatigue, immune dysfunction, cardiometabolic disease, and cognitive decline.3 High-risk populations include individuals with malabsorptive disorders, chronic medication use, advanced chronic diseases, and socioeconomic disadvantage.4

We propose a structured clinical framework to support the identification, assessment, and management of micronutrient deficiencies, and illustrate its application through three representative clinical cases.

 

Main Narrative

Patient Profile 1: Polycythemia Vera with Severe Malnutrition

A 44-year-old with polycythemia vera presented with progressive weakness, significant unintentional weight loss (from 73 to 50 kg), and recurrent falls. History was notable for recurrent pancreatitis, multiple deep vein thromboses requiring warfarin therapy, food insecurity, and complete edentulism. The patient’s daily diet consisted almost exclusively of fast food and a single nutritional supplement. Physical examination revealed a BMI of 17.28 kg/m2, generalized muscle wasting, tremor, and gait instability-each a potential indicator of micronutrient compromise. Laboratory evaluation confirmed deficiencies in vitamins A, C, E, B2, B6, and B7; iron and ferritin; zinc; omega-3 index; and hypoalbuminemia. This profile illustrates how overlapping chronic diseases, food insecurity, medication-nutrient interactions (warfarin and vitamin K–rich vegetables), poor dentition, and reliance on ultra-processed foods converge to produce severe, multi-domain nutritional compromise.

 

Patient Profile 2: Post-Bariatric Surgery Deficiencies

A 52-year-old presented with fatigue and weight regain (from 127 to 142 kg) following Roux-en-Y gastric bypass. Past medical history included prediabetes, hypertension, obstructive sleep apnea, and bilateral hip arthroplasty. The patient reported consuming four sodas daily, minimal vegetables, and poor adherence to prescribed supplementation. Chronic proton pump inhibitor (PPI) use was documented. Laboratory evaluation revealed low iron, ferritin, and mean cellular volume (MCV); low vitamin D, A, and E; zinc; omega-3 index; and elevated high-sensitivity C-reactive protein (hs-CRP). This profile emphasizes the potential malabsorption risk created by bariatric anatomy,6 compounded by iatrogenic factors such as PPI use, behavioral patterns including ultra-processed food consumption, and sarcopenic obesity, which can contribute to nutritional depletion.

 

Patient Profile 3: Common Variable Immunodeficiency

A 58-year-old presented with failure to thrive, esophageal spasms, and progressive gastrointestinal symptoms following COVID-19 vaccination. History was significant for common variable immunodeficiency (CVID) on intravenous immunoglobulin replacement and chronic smoking. The patient’s diet was predominantly ultra-processed foods with deliberate avoidance of fiber due to gastrointestinal discomfort. Physical examination revealed a BMI of 18.3 kg/m2, muscle wasting, and oral candidiasis. Laboratory findings included reduced vitamins B6, B7, B12, C, D, and omega-3 index. This profile illustrates how post-infectious inflammatory cascades, immune dysregulation, dysbiosis, food intolerance, and psychosocial factors- chronic significant anxiety – can amplify nutritional vulnerability in patients with pre-existing immunodeficiency.

 

Medications and Micronutrient Depletion

Several commonly prescribed medications are well-documented contributors to micronutrient deficiency. The most common medications associated with micronutrient depletion include PPIs (which impair absorption of vitamin B12, magnesium, and iron), metformin (associated with vitamin B12 depletion), loop and thiazide diuretics (which increase urinary losses of potassium, magnesium, zinc, and thiamine), antipsychotics and tricyclic antidepressants (linked to zinc and B-vitamin depletion).4,8 Clinicians should maintain heightened vigilance for nutritional deficiencies in patients on these agents, particularly when multiple depleting medications are co-prescribed.

 

Advanced Chronic Diseases and Micronutrient Vulnerability

Advanced chronic diseases are independently associated with micronutrient deficiency through mechanisms including malabsorption, increased metabolic demand, reduced dietary intake, and drug-nutrient interactions. The most common advanced chronic diseases associated with micronutrient deficiency include cirrhosis- especially decompensated disease- (associated with deficiencies in folate, thiamine, zinc, selenium, vitamin D, and vitamin E), chronic kidney disease, inflammatory bowel disease, heart failure (associated with thiamine, selenium, and vitamin D depletion), and obesity (particularly following bariatric surgery).11,12,18,19

Malnutrition is defined as an imbalance between nutrient intake and bodily needs. This condition results in altered body composition, most commonly, the loss of muscle mass, as well as diminished physical and mental function and impaired clinical outcomes.18,19 The term encompasses deficiencies, excesses, or imbalances in energy or nutrients.15 It is worth mentioning that malnutrition is a frequently underdiagnosed condition that may coexist in patients who are overweight, obese, or underweight. Ultra-processed foods, classified by the NOVA framework,17 represent a major dietary contributor to micronutrient displacement if present as the predominant diet.

 

Proposed Clinical Framework

The following framework (Table 1) is proposed to help clinicians systematically identify, assess, and manage micronutrient deficiencies in high-risk patients. Vitamin supplementation in the absence of documented deficiency or suboptimal levels may not be effective; however, targeted repletion in high-risk individuals with confirmed deficiency is more likely to improve clinical outcomes.9,10

 

Table 1. Proposed Clinical Framework for Micronutrient Deficiency Management

Component Key Elements
Risk Stratification Consider assessment with ≥2 features with physical exam findings:

Malnutrition or ultra-processed predominant diet

Restrictive eating (vegan, carnivore)

Malabsorptive disorders

Food insecurity and living in food desert areas

Chronic smoking, alcohol or drug use

Advanced chronic disease or chronic medication use

Impaired wound healing, and altered taste/smell.11,12

Physical Examination BMI <18.5 kg/m² or sarcopenia (muscle wasting with weakness)

Oral exam abnormalities (edentulousness, glossitis, candidiasis)

Integumentary findings (brittle hair/nails, perifollicular hemorrhage)

Neurological signs (neuropathy, ataxia), and muscle wasting.13

Laboratory Assessment Consider stopping any multivitamins 2–3 days before the blood draw, especially water-soluble vitamins.

Nutritional Panel includes: CBC, CMP, vitamin B6, B12 with methylmalonic acid/homocysteine, folate-RBC, iron studies, Hs-CRP, 25-hydroxyvitamin D, vitamins A, C, and E, vitamin B2, B3, B7, omega-3 index, magnesium-RBC, zinc, copper, and ceruloplasmin.5,14

Intervention Identify the root cause of each deficiency, educate the patient, and assess cultural preferences and ability to change.

Prioritize whole-food, nutrient-dense diets with adequate protein (0.8–1.5 g/kg) ¹⁵, see [table 2].

Assess the sustainability and feasibility of interventions to ensure continued access to lifestyle change.

Use targeted supplementation as a short-term adjunct; discontinue once deficiencies are resolved.

Collaborate across disciplines; Integrate budget-conscious, socially aware, and culturally congruent food access strategies (e.g., food pantries).

Persistent deficiencies warrant malabsorption evaluation and adjustment of supplement form, dose, timing, and food–nutrient synergy.

Monitoring Reassess laboratories at 8–12 weeks with monthly tracking of symptoms, dietary adherence, and barriers.20

 

The intervention strategy should begin with identifying the root cause of each deficiency, educating the patient about its clinical implications, and assessing personal or cultural preferences and capacity for change. Food-based interventions should be the primary approach; studies involving multiple food-based interventions have reported a positive impact on micronutrient status and various health parameters.21 While supplementation does not address the underlying root cause, it can be an effective solution for preventing and addressing micronutrient deficiencies in specific at-risk groups.22

The use of one-size-fits-all supplementation is not risk-free; harmful effects of high-dose supplementation with individual vitamins, including β-carotene (risk of lung cancer in smokers) and vitamin E (increased risk of heart failure), have been reported.16 High-dose calcium supplementation (1000 mg/day) combined with vitamin D increased kidney stone incidence by 18% over 4-7 years in multiple trials.23

 

Food as Medicine: Whole-Food Nutrient Delivery

An example of a food-first approach is provided below (Table 2), illustrating practical whole-food strategies for each micronutrient. These recommendations are designed to be individualized based on patient preferences, cultural background, food access, and clinical context.

 

Table 2. Food-Based Approaches to Micronutrient Repletion

Nutrient Recommended Whole Food Approach & Measurements24Clinical Notes for Patient
Vitamin B12 3–4 oz beef OR 3 pasture-raised eggs + 6 oz plain yogurt daily.Does not occur naturally in plants. Vegans must supplement or use fortified nutritional yeast. Consider methylated forms if MTHFR variant or high homocysteine is present.
Zinc 3–4 oz beef daily + ½ cup lentils + 1 oz pumpkin seeds + 1.5 oz cheddar cheese daily.Synergistic blend of animal and plant-based sources.
Vitamin E 1 tbsp wheat germ oil every other day OR 2 oz sunflower seeds daily.Excellent for antioxidant support in lifestyle medicine.
Vitamin C 1 cup red bell peppers OR 1 cup broccoli daily.Food sources are superior to isolated ascorbic acid as they provide the full vitamin C complex.
Omega-3 6 oz wild sockeye salmon or sardines 3× weekly.Fish is recommended for DHA/EPA. Plant sources (flax/chia) contain ALA, which has a low conversion rate to DHA/EPA.
Vitamin D ½ tbsp cod liver oil OR 1 cup white mushrooms daily.Sunlight remains the best natural source for optimization.
Magnesium 2 oz pumpkin seeds + 1 oz chia seeds (added to smoothie) daily.High-fiber, nutrient-dense delivery method.
Vitamin B7 (Biotin) 3 pasture-raised eggs daily, alternating with 6 oz wild sockeye salmon daily.Focuses on high-bioavailability protein sources.
Vitamin B5 3 oz beef liver, 1 cup shiitake mushrooms, OR ½ cup sunflower seeds daily.Includes potent organ meat and fungal sources.
Iron 3 oz beef liver + 1 cup white beans OR 1 cup oysters + 1 cup lentils + 1 cup spinach daily.Heme (animal) sources have significantly higher bioavailability than non-heme (plant) sources.
Vitamin B2 3 oz beef liver OR 2 oz almonds + 3 oz Swiss cheese + ½ cup portabella mushrooms daily.Balanced approach for energy metabolism.
Folate (B9) 1 cup spinach + ½ cup black-eyed peas + 4 asparagus spears daily.Natural food folate is preferred over synthetic folic acid, especially for those with MTHFR variants.
Vitamin A ½ sweet potato OR ½ cup spinach + ¼ cup carrots daily.Provides essential carotenoids for immune and vision health.
Vitamin B6 1 cup chickpeas + 1 medium banana OR 3 oz wild sockeye salmon + 1 cup potatoes daily.Supports neurotransmitter synthesis and hormonal balance.
Vitamin B1 1 cup black beans + ½ cup acorn squash + ½ cup brown rice daily.Whole grain and legume-based approach for thiamine optimization.

 

 

 

 

Conclusions

Nutritional deficiencies significantly contribute to chronic disease, especially in high-risk populations. The three cases discussed in this study demonstrate how autoimmune disease, bariatric surgery, immunodeficiency, medications, food insecurity, and ultra-processed diets interact to create clinically meaningful micronutrient vulnerability. The proposed clinical framework offers a structured, patient-centered method to identify deficiencies, guide appropriate testing, and implement sustainable, culturally appropriate, food-first interventions that target root causes. Consistent application may improve early detection, reduce nutrition-related disease burden, and strengthen the role of nutrition in primary care and lifestyle medicine.

 

Funding

No funding was received to assist with the preparation of this manuscript

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