ABSTRACT
Micronutrient deficiencies are a major public health concern in low- and middle-income countries, where conventional supplementation and fortification programs are often limited by low bioavailability, fragile supply chains, cultural resistance, and poor long-term adherence. This research note proposes a food-based alternative model that leverages selected traditional Korean foods (K-foods)—gim (dried seaweed), kimchi (fermented vegetables), and cheonggukjang (fermented soybean paste)—as culturally adaptable and nutritionally dense components of official development assistance nutrition strategies. These foods provide functionally relevant nutrients, such as iodine, vitamin K2, probiotics, and fermentation-derived bioactive peptides, and offer benefits, including shelf stability, microbial resilience, and decentralized production. Employing a multidisciplinary clinical nutrition framework integrating food composition science, fermentation biology, public health nutrition, and development policy, this note presents a five-step research roadmap encompassing nutrient profiling, safety and stability assessment, cultural acceptability evaluation, community-based efficacy trials, and policy translation. By prioritizing food-based, multinutrient dietary interventions over single-nutrient strategies, the proposed model highlights a scalable and clinically relevant pathway for enhancing micronutrient status in resource-limited settings. This work contributes to emerging discussions on nutrition-sensitive official development assistance and highlights K-foods as potential tools for sustainable, culturally responsive global nutrition interventions.
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Keywords: Food assistance; Diet; Fermented foods; Developing countries; Micronutrients
INTRODUCTION
Micronutrient deficiencies—often referred to as “hidden hunger”—remain a persistent and structurally embedded public health concern in many low- and middle-income countries (LMICs) [
1]. Beyond their direct effects, including increased susceptibility to infection, elevated mortality, and impaired physical and cognitive development, micronutrient deficiencies exert long-term socioeconomic impacts by increasing the lifetime risk of chronic diseases and placing sustained pressure on already-constrained healthcare systems [
2]. Deficiencies in iodine, iron, and essential vitamins are among the most prevalent, with disproportionately severe impacts during biologically vulnerable periods, such as pregnancy, early childhood, and adolescence, when nutritional inadequacy can result in irreversible developmental deficits [
3].
To overcome this challenge, official development assistance (ODA) programs have largely prioritized population-level, nutrient-specific interventions, including universal salt iodization programs led by the World Health Organization (WHO) and the United Nations Children’s Fund as well as iron-folic acid supplementation delivered via maternal and child health platforms in LMICs. Universal salt iodization is one of the most successful public health strategies, with approximately 89% of the global population consuming iodized salt as of 2020 [
4]. However, nearly 1 billion people still lack access to adequately iodized salt. Despite these efforts, iodine deficiency continues to affect approximately 2 billion individuals worldwide, particularly in LMICs [
5].
However, the effectiveness and sustainability of these approaches have been inconsistent across LMICs. Structural barriers—such as fragile health and food distribution infrastructures, low bioavailability of supplemented nutrients, and supply-chain interruptions—frequently undermine program coverage and adherence [
6]. Furthermore, sociocultural resistance to synthetic supplements, concerns regarding side effects, and stigma associated with targeted supplementation further constrain uptake, even in regions where policies are formally in place.
Contrarily, traditional food-based practices historically provided context-specific and culturally embedded mechanisms for micronutrient intake enhancement. Examples include the use of iron cooking vessels to increase dietary iron content and the regular consumption of fermented foods rich in bioavailable vitamins and minerals. However, these practices have been progressively displaced by rapid dietary transitions, increased reliance on ultra-processed foods, and food system globalization [
7]. Consequently, many LMIC populations are currently facing a compounded nutritional vulnerability characterized by the erosion of indigenous, food-based nutrient sources and the limited effectiveness of externally driven supplementation strategies. These limitations highlight the need for alternative ODA nutrition strategies that are biologically effective, culturally acceptable, food-based, and locally adaptable.
In this research note, the potential of traditional Korean foods (K-foods)—with a particular focus on gim, kimchi, and cheonggukjang—as illustrative models for food-based ODA interventions was explored. By examining their micronutrient profiles, fermentation-driven bioavailability, and cultural adaptability, we argue that selected K-foods provide a scalable and context-sensitive framework for complementing conventional supplementation strategies in low-resource settings.
RATIONALE FOR FOOD-BASED INTERVENTIONS IN LMICs
Limitations of supplement- and fortification-based programs
Over the past several decades, nutrition-focused ODA programs in LMICs have heavily relied on micronutrient supplementation (e.g., iron-folic acid tablets) and food fortification strategies (e.g., vitamin A-enriched cooking oil and iodized salt) [
8]. Although these interventions are supported by robust evidence and have shown efficacy in controlled or short-term programmatic settings [
9,
10], their real-world effectiveness has been inconsistent and often constrained by structural, biological, and sociocultural factors:
First, limitations in nutrient bioavailability remain a persistent challenge. Fortified nutrients and synthetic supplements frequently show diminished absorption in diets high in phytates, low in fat, or lacking dietary diversity—conditions common in many LMIC settings [
11,
12]. Consequently, the nominal coverage of supplementation or fortification does not necessarily translate into meaningful micronutrient status improvements [
13].
Second, poor adherence and treatment discontinuation markedly undermine program impact. In particular, iron supplementation programs are often affected by gastrointestinal side effects, misconceptions regarding safety, and inadequate counseling, resulting in low compliance even among nutritionally vulnerable populations [
14].
Third, cultural and behavioral barriers further limit uptake. Externally introduced supplements or fortified products may be perceived as foreign, medicinal, or incompatible with local food practices, generating resistance driven by distrust, unfamiliarity, or concerns regarding long-term health effects. Such perceptions can diminish household and community acceptance despite formal policy endorsement [
15,
16].
Finally, many supplementation- and fortification-based interventions are characterized by short-term, donor-dependent implementation with limited integration into local food systems or daily dietary behaviors. Consequently, these programs often fail to induce sustained changes in dietary patterns or strengthen local capacity for long-term nutritional resilience.
Collectively, these constraints highlight the need for alternative nutrition strategies that move beyond isolated nutrient delivery toward more integrated, food-based approaches. Aligning ODA nutrition strategies with locally embedded food practices may provide a more sustainable pathway for micronutrient adequacy improvement while supporting dietary continuity and food system resilience in LMICs.
Food-based approaches using traditional K-foods as sustainable and culturally adaptable solutions
Given the persistent limitations of supplementation- and fortification-based nutrition interventions in many LMICs, food-based strategies have attracted increasing attention as practical and sustainable alternatives. A large-scale randomized controlled effectiveness study conducted in rural Mozambique reported that the introduction of β-carotene–rich orange-fleshed sweet potato significantly increased vitamin A intake among populations. Specifically, OSP consumption increased by 46, 48, and 97 g/day among younger children (6–35 months), older children (3.0–5.5 years), and women, respectively. Correspondingly, vitamin A intake increased by 263-, 254-, and 492-μg retinol activity equivalents/day, respectively. These findings suggest that food-based interventions can markedly improve micronutrient intake in real-world community settings [
17]. Although such approaches have traditionally focused on revitalizing indigenous food systems, a recent discourse in global nutrition assistance has begun acknowledging the potential role of externally sourced but culturally adaptable food models. Particularly, fermented foods with high nutrient density and minimal processing may complement local diets and fill micronutrient gaps without undermining existing food cultures.
Traditional K-foods—including gim (dried seaweed), kimchi (fermented vegetables), and cheonggukjang (fermented soybean paste)—are illustrative examples of transferable, food-based intervention models integrating functional nutritional value with logistical feasibility. Although these foods are not indigenous to LMICs, they possess several attributes that support their consideration as nutrition-sensitive ODA tools.
First, these foods offer high nutritional density and functional diversity, providing micronutrients and bioactive components—such as iodine [
18], vitamin K
2 [
19], dietary fiber [
20], and fermentation-derived metabolites [
21]—commonly insufficient in LMIC diets. Second, fermentation-based production and microbial content may improve gut health and nutrient bioavailability, which is relevant in populations with recurrent infections, environmental enteropathy, or limited access to medical services. Third, many K-foods exhibit favorable storage and transport characteristics; for example, dried seaweed and fermented pastes are shelf-stable, lightweight, and adaptable to centralized or decentralized distribution systems in resource-limited settings. Finally, despite their external origin, K-foods possess a notable degree of cultural adaptability, as their preparation methods, sensory profiles, and fermented nature resemble traditional foods consumed in parts of South and Southeast Asia and Africa, potentially facilitating acceptance when introduced through culturally sensitive ODA frameworks [
22,
23].
Essentially, this approach is not intended to replace or override local food systems. Rather, it proposes the targeted use of selected, minimally processed K-foods to supplement specific dietary gaps among high-risk populations, such as pregnant women, school-aged children, and older adults. By prioritizing sustainability, functional nutrition, and contextual feasibility, this model aligns with emerging paradigms in global food assistance that highlight not only caloric provision but also micronutrient adequacy and cultural respect.
Microbial resilience and shelf stability of fermented K-foods in ODA contexts
To ensure feasibility within ODA frameworks, the microbial resilience and storage stability of fermented K-foods must be considered under real-world distribution conditions. Fermented vegetable products, such as kimchi, undergo rapid acidification mediated by lactic acid bacteria, with pH values reaching 4.0 during fermentation, as reported in natural kimchi fermentation studies [
24]. This acidic environment suppresses the growth of pathogenic microorganisms, enhancing intrinsic microbial safety during storage and transport. In addition to safety, fermented foods demonstrate notable shelf stability. Experimental studies have demonstrated that kimchi maintains acidic conditions during storage, with pH values of 4.1, 3.6–3.7, and 4.1 at 4, 10, and 25 °C, respectively, over extended storage periods of up to 8 weeks, reflecting sustained microbial stability and preservation capacity [
25].
Contrary to vegetable-based fermented products, cheonggukjang, a
Bacillus subtilis-fermented soybean paste, has a distinct microbial and physicochemical stability profile [
26]. During fermentation,
Bacillus spp. produce antimicrobial peptides and enzymes that are crucial for product preservation and suppress the growth of spoilage microorganisms. Cheonggukjang also has relatively low water activity and is typically consumed in paste or semisolid form, which reduces the risk for microbial contamination. Previous studies have reported that
Bacillus-dominated fermented soybean products maintain microbial stability and functional activity under ambient or slightly chilled conditions, with viable
Bacillus populations remaining detectable during storage periods of several weeks [
27]. These characteristics support its resilience to environmental fluctuations and suitability for decentralized production and distribution systems.
Unlike fermented foods, gim (dried seaweed) represents a low-moisture, shelf-stable product with minimal microbial activity. Owing to its dehydration during processing, gim has extremely low water activity, which effectively prevents microbial growth and spoilage. Dried seaweed products can be stored at an ambient temperature for extended periods, often exceeding several months, without substantial deterioration in microbiological safety or nutrient composition with proper packaging. Experimental studies have demonstrated that drying processes (air- or freeze-drying) induce considerable log-scale reductions in microbial load, with further decreases observed after storage of up to 6 weeks [
28]. Furthermore, its lightweight and compact form facilitates bulk transportation and long-distance distribution without requiring refrigeration. These properties make gim suitable for ODA supply chains, which have limited cold-chain infrastructure and variable storage conditions.
From a logistics perspective, the implementation of K-foods within ODA programs requires product-level stability and compatibility with robust and flexible supply-chain systems. In many LMICs, nutrition interventions are constrained by limited cold-chain infrastructure, transportation delays, and decentralized distribution networks. In this context, the diverse stability profiles of K-foods support the development of multitiered supply strategies. For example, shelf-stable products, such as gim, can be transported and stored at an ambient temperature for extended periods, serving as baseline nutritional components in large-scale distributions. Semisolid fermented products, such as cheonggukjang, can be incorporated into localized production or short-distance distribution models owing to their moderate storage stability and microbial resilience. Meanwhile, products like kimchi may be integrated into regional or community-level supply systems where limited refrigeration is available. This tiered approach facilitates the development of resilient supply chains that combine centralized production with decentralized distribution, thereby enhancing continuity, reducing spoilage risk, and improving the overall feasibility of nutrition delivery in resource-limited settings.
Collectively, these findings suggest that K-foods encompass diverse but complementary stability profiles: kimchi provides biologically active fermentation-based resilience, cheonggukjang offers enzyme- and Bacillus-mediated preservation in a semisolid form, and gim ensures long-term stability through dehydration. This combination improves the feasibility of incorporating K-foods into ODA nutrition programs by accommodating a range of logistical constraints and storage environments.
NUTRITIONAL AND FUNCTIONAL PROFILES OF TRADITIONAL K-FOODS
K-foods combine high nutritional density, fermentation-derived functionality, and logistical practicality, making them strong candidates for food-based nutrition interventions in LMICs. Among these, gim (dried seaweed), kimchi (fermented vegetables), and cheonggukjang (fermented soybean paste) are noteworthy owing to their micronutrient profiles, bioavailability-enhancing fermentation processes, and adaptability across diverse dietary and programmatic contexts.
Gim, or dried seaweed, is a nutrient-dense marine food widely consumed in Korean diets and has been recognized as a rich source of iodine—an important micronutrient required for thyroid hormone synthesis and neurodevelopment [
29]. Iodine deficiency remains a major public health concern in many LMICs, particularly among pregnant women and young children. Gim provides iron, folate, and vitamin B
12, in addition to iodine, which are important for hematological and neurological functions and are often deficient in vulnerable populations. Beyond its nutritional value, gim offers several operational advantages for food assistance programs, including being lightweight, shelf-stable without refrigeration, and easily transportable in bulk. Furthermore, its relatively simple processing and reliance on marine resources indicate potential opportunities for technology transfer and localized seaweed cultivation in coastal LMIC regions, thereby supporting longer-term sustainability.
Kimchi, a fermented vegetable food most commonly prepared from Napa cabbage, is a rich source of live microorganisms produced via lactic acid fermentation. This process improves nutrient bioavailability and generates probiotic bacteria—mainly
Lactobacillus species—that contribute to gut microbiota modulation, digestive function improvement, and immune support [
30]. Such effects are relevant in LMICs where gastrointestinal infections and impaired gut health are prevalent. Kimchi also provides substantial amounts of vitamins A, C, and K, dietary fiber, and diverse phytochemicals that support immune defense, bone health, and antioxidant capacity. Notably, the widespread cultural familiarity with fermented vegetables across many LMIC regions offers a strong basis for adapting kimchi-like products using locally available vegetables and seasonings, which can enhance cultural acceptance and dietary integration.
Cheonggukjang, a rapidly fermented soybean paste, is distinguished by its exceptionally high vitamin K
2 content, particularly in the menaquinone-7 (MK-7) form, which has greater bioavailability and longer biological half-life than phylloquinone (vitamin K
1). As a legume-based fermented food, cheonggukjang also supplies plant-derived protein, B vitamins, and bioactive peptides with documented antioxidant and anti-inflammatory properties. Its fermentation is mainly driven by
B. subtilis, which exerts beneficial effects on gut microbiota composition, immune modulation, and metabolic regulation [
31]. From an implementation standpoint, cheonggukjang’s paste form allows flexible packaging and accurate portioning, including single-serving formats suitable for school feeding programs, maternal nutrition interventions, and emergency food assistance. Its stability at room temperature and concentrated nutrient profile make it particularly suitable for food-based ODA strategies targeting bone health and vascular function in nutritionally vulnerable groups.
To further contextualize the potential public health relevance of these K-foods, it is crucial to consider the degree of micronutrient deficiencies in LMIC populations and the extent to which these foods could help address such gaps.
Iodine deficiency remains a major public health concern globally, affecting approximately 2 billion individuals. Its prevalence among school-aged children worldwide is reportedly 29.8%. In specific LMIC contexts, the burden can be markedly higher; for example, a recent systematic review and meta-analysis in Ethiopia reported a pooled prevalence of 58% (95% confidence interval [CI], 44%–77%) among school-aged children, with regional estimates as high as 64% (95% CI, 49%–79%) [
32]. In a randomized 2×2 crossover trial involving 20 healthy young women, a seaweed-based meal consisting of sushi with
nori (
Porphyra spp.) and wakame (
Undaria pinnatifida) salad provided 231 μg of iodine, comparable to 225 μg from a potassium iodide supplement. Urinary iodine levels increased after both interventions within 48 hours. However, the estimated 24-hour bioavailability was 75% for the seaweed-based meal compared with 97% for the potassium iodide supplement. Despite the lower bioavailability, the seaweed-based meal still provided a substantial amount of absorbable iodine, supporting its potential as a dietary iodine source for populations at risk of iodine deficiency [
33].
Similarly, disruptions in gut health and microbiota composition are common in LMIC settings, frequently associated with environmental enteric dysfunction and recurrent infections. Probiotic intake through fermented foods has been shown to enhance intestinal barrier function and immune responses. Fermented kimchi contains high levels of lactic acid bacteria, typically in the range of 10
8–10
9 colony-forming units (CFU)/g, providing a substantial microbial load that may support its probiotic activity [
34]. A recent scoping review of prospective clinical studies identified 11 randomized controlled trials evaluating kimchi or kimchi-derived probiotics, including 638 participants, of whom 608 completed the interventions. Most of these trials evaluated metabolic and clinical outcomes and consistently observed beneficial effects on gastrointestinal symptoms, including those associated with bowel function. These findings suggest that kimchi consumption exerts measurable clinical effects across multiple physiological domains, although further well-controlled trials are warranted [
35]. Quantitative clinical evidence suggests that kimchi may serve as a low-cost fermented food capable of enhancing gut and metabolic resilience in nutritionally vulnerable populations.
Although less frequently quantified at the population level, vitamin K
2 deficiency is increasingly acknowledged as a contributor to impaired bone and cardiovascular health, particularly in populations with low intake of fermented foods. Cheonggukjang provides approximately 800–1,000 μg of MK-7 per 100 g, which means that even a modest intake of 10–20 g can supply 80–200 μg of vitamin K
2—levels associated with activation of vitamin K–dependent proteins, such as osteocalcin and matrix Gla protein (MGP). Direct randomized human trials showing that cheonggukjang corrects vitamin K deficiency remain scarce; however, its biological relevance is supported by clinical evidence on MK-7, a key component of fermented soybean products. In a randomized, placebo-controlled trial, 244 healthy postmenopausal women received 180 μg/day of MK-7 supplementation for 3 years, which markedly improved vitamin K status and attenuated age-related declines in bone mineral content and density at the lumbar spine and femoral neck. Furthermore, MK-7 supplementation favorably affected bone strength and reduced vertebral height loss compared with placebo. These findings highlight the potential of MK-7–rich fermented foods as dietary tools to improve vitamin K-related outcomes, although direct evidence for cheonggukjang has yet to be established [
36]. This is particularly relevant in LMICs facing increasing prevalence of osteoporosis and vascular calcification among aging populations.
Collectively, these estimates suggest that relatively small, culturally adaptable portions of selected K-foods can help fill critical micronutrient gaps in LMIC populations. Importantly, unlike single-nutrient interventions, these foods simultaneously provide multiple bioactive components, offering a synergistic approach to addressing complex nutritional deficiencies. Their strategic inclusion in ODA nutrition programs provides a means of addressing multiple micronutrient deficiencies while adhering to principles of sustainability, cultural adaptability, and dietary integrity.
Table 1 presents a detailed overview of their nutrient compositions and associated health functions [
37].
RESEARCH ROADMAP: STEPS FOR INTEGRATING K-FOODS INTO FOOD-BASED ODA NUTRITION STRATEGIES
To systematically investigate the feasibility, effectiveness, and scalability of traditional K-foods—such as gim, kimchi, and cheonggukjang—as culturally adaptable, food-based nutrition interventions in LMICs, a five-step research framework has been proposed in
Table 2. This roadmap was designed to provide evidence across nutritional, operational, sociocultural, and policy dimensions, supporting the translation of food-based concepts into implementable ODA nutrition strategies:
Comprehensive nutrient profiling should be conducted for selected K-foods using internationally recognized nutritional assessment frameworks. This includes consistency with Food and Agriculture Organization of the United Nations (FAO)/WHO dietary reference systems, such as Estimated Average Requirements, Recommended Nutrient Intakes, and Adequate Intake [
38], as well as Codex Alimentarius guidelines for nutrient reference values utilized in global nutrition labeling [
39]. Particular emphasis should be placed on evaluating the contribution of key micronutrients—such as iodine, vitamin K
2 (MK-7), and fermentation-derived probiotics—to daily nutritional requirements. For iodine, the intake levels should be interpreted relative to the WHO/UNICEF/ICCIDD criteria, with urinary iodine concentration cutoffs (<100 μg/L indicating deficiency in school-aged children) used as a population-level biomarker [
40]. For vitamin K
2, although global deficiency cutoffs are not fully standardized, nutritional relevance should be evaluated using functional biomarkers, such as undercarboxylated osteocalcin and MGP [
41], consistent with current clinical nutrition research. For probiotics, evaluation should follow the FAO/WHO guidelines, including minimum effective levels (typically ≥10
6–10
9 CFU/day) and evidence of strain-specific health effects [
42]. Moreover, nutrient profiling should consider dietary contribution metrics, such as the percentage of daily requirements met per serving, to enable comparison across populations and dietary systems.
Goal: to establish nutritionally meaningful, internationally standardized, and clinically interpretable profiles of K-foods for use in global nutrition research and policy frameworks.
Step 2: safety, stability, and packaging assessment for ODA deployment
Food safety evaluations should address microbial quality, allergenicity, shelf life, and physicochemical stability under ODA-relevant conditions, including tropical climates and limited cold-chain infrastructure. Furthermore, product-specific considerations—such as probiotic viability in kimchi and bioactive peptide stability in cheonggukjang—should be systematically evaluated using standardized protocols. This includes quantifying probiotic viability (e.g., CFU) at multiple stages of storage and distribution, evaluating strain-specific survival under gastrointestinal conditions as well as functional activity. For cheonggukjang, the stability of bioactive peptides should be explored across processing and storage conditions, including changes in peptide composition, enzymatic activity, and bioactivity in simulated physiological environments.
Goal: to identify formulations, processing conditions, and packaging formats compatible with long-distance transport and low-resource distribution environments.
Step 3: cultural acceptance and dietary adaptation studies
Qualitative research and small-scale pilot studies should be conducted in selected LMICs to assess sensory acceptance, culinary compatibility, and potential sociocultural barriers to adoption. Participatory strategies, including co-creation workshops with local stakeholders, may guide culturally appropriate adaptations (e.g., reduced pungency in kimchi or powdered formulations of cheonggukjang) while preserving nutritional functionality.
To facilitate cultural integration, strongly fermented K-foods, such as kimchi and cheonggukjang, should be incorporated into existing local dishes at controlled inclusion levels. For kimchi, adding approximately 10 to 20 g per serving (corresponding to approximately 5% to 10% of the total dish weight) represents a moderate inclusion level that is typically considered acceptable in mixed-dish formulations without causing considerable sensory rejection. For cheonggukjang, powdered or diluted paste forms can be incorporated into legume-based soups or cereal porridges at 5 to 10 g per serving (approximately 3% to 5% of dish weight), enabling protein and vitamin K2 delivery with minimal impact on odor perception. Such low-to-moderate inclusion levels enable “matrix integration,” where K-foods serve as nutritional ingredients rather than standalone items, thereby aligning with existing culinary practices. This strategy supports gradual sensory adaptation and enhances acceptability across diverse cultural contexts without requiring major dietary modifications.
Goal: to develop context-sensitive adaptation strategies that maximize acceptability and minimize resistance at the household and community levels.
Step 4: nutritional impact evaluation through community-based interventions
Pilot intervention studies targeting nutritionally vulnerable populations—such as school-aged children, pregnant women, or older adults—should be conducted to evaluate changes in dietary intake, relevant biomarkers, and selected health outcomes over medium-term periods. Mixed-methods designs are recommended to capture the biological effects and social or behavioral dimensions of program implementation.
Goal: to generate field-based evidence regarding the nutritional efficacy, feasibility, and real-world impact of K-food-based interventions.
Step 5: policy translation and integration into the ODA program design
Findings from the preceding steps should be synthesized into policy-relevant recommendations and scalable program models. Collaboration with key ODA stakeholders—including the Korea International Cooperation Agency, the World Food Program, and the FAO—will be crucial for integrating K-food-based components into existing platforms, such as school feeding programs, maternal nutrition initiatives, or emergency food assistance schemes.
Goal: to develop a modular, export-ready K-food-based nutrition support model consistent with Sustainable Development Goal 2 (zero hunger) and broader global food security and nutrition frameworks.
LIMITATIONS OF K-FOOD-BASED ODA MODELS AND POTENTIAL BREAKTHROUGH STRATEGIES
A primary limitation of K-food-based nutrition strategies within ODA frameworks is cost-effectiveness. Compared with highly processed micronutrient tablets or fortified premixes, food-based interventions—particularly those involving fermentation, quality control, and international transport—may initially incur higher per-unit costs [
23]. Expenses for raw materials, processing standardization, packaging, storage, and regulatory compliance can challenge economic feasibility, particularly in large-scale humanitarian settings where the cost per beneficiary is a crucial metric.
However, a narrow comparison based solely on unit price overlooks broader cost–benefit considerations relevant to clinical and public health nutrition. Conventional supplementation programs often require repeated procurement, continuous donor financing, medical supervision, and parallel behavior-change communication efforts owing to low adherence and side effects. Contrarily, food-based interventions may reduce indirect costs by enhancing dietary adherence, reducing adverse effects, and delivering multiple micronutrients, potentially lowering long-term programmatic and healthcare expenditures [
43].
Beyond cost, variability in nutrient composition represents a technical limitation. The micronutrient content of fermented foods, such as kimchi and cheonggukjang, may vary according to raw materials, fermentation conditions, and processing methods, which complicate standardization and dose estimation. Food safety and regulatory compliance pose additional challenges, including microbial control, allergenicity (e.g., soy-based products), and sodium content. In addition, cultural unfamiliarity and sensory barriers may limit initial acceptance in some LMICs, whereas logistical constraints associated with scaling production and quality assurance may affect consistent delivery.
Several breakthrough strategies can overcome these limitations. Economies of scale and process optimization, including centralized production combined with regional distribution hubs, can markedly reduce per-unit costs. Advances in food processing—such as low-sodium fermentation, allergen mitigation, freeze-drying, or powderization—may further enhance cost efficiency, shelf stability, and safety. Local coproduction and technology transfer models, utilizing regionally available raw materials and decentralized fermentation systems, provide pathways for reducing costs while strengthening local food systems and employment.
From a clinical nutrition perspective, targeted and modular deployment represents a critical breakthrough. Rather than replacing low-cost supplementation programs, K-food-based interventions may be most effective when used as complementary tools for high-risk populations—such as pregnant women, school-aged children, or individuals with persistent micronutrient deficiencies—in whom adherence, gut health, and multinutrient delivery are particularly crucial. Integrating these foods into existing dietary patterns or institutional feeding platforms can further improve clinical effectiveness without increasing costs.
Collectively, acknowledging cost-related constraints while adopting strategic innovations allows K-food-based ODA models to move beyond price comparisons toward value-based evaluation. These breakthrough strategies offer a pragmatic bridge between economic feasibility and clinical impact, setting the stage for the broader implications discussed in the following section.
IMPLICATIONS OF THE CURRENT RESEARCH NOTE
From a clinical nutrition standpoint, this research note offers a translational framework that links nutritional biochemistry, food science, and population-based intervention design within low-resource settings. By moving beyond reductionist approaches centered on single-nutrient supplementation or fortification, this model highlights the clinical relevance of food-based interventions that simultaneously deliver multiple micronutrients while supporting bioavailability, gut health, and dietary adherence. In this context, traditional K-foods—gim, kimchi, and cheonggukjang—are proposed as clinically meaningful candidates for nutrition-sensitive ODA strategies.
The potential of K-foods to alleviate “hidden hunger” extends beyond simple nutrient provision to involve specific biochemical and physiological mechanisms. Hidden hunger, marked by subclinical micronutrient deficiencies, often manifests as impaired metabolic regulation, immune dysfunction, and reduced nutrient utilization efficiency. The nutrients and bioactive components present in K-foods—such as iodine, vitamin K2, and fermentation-derived probiotics—interact with clinical nutrition pathways at multiple levels.
Iodine derived from gim directly supports thyroid hormone synthesis (T3 and T4), which regulates basal metabolic rate, neurodevelopment, and energy homeostasis. In iodine-deficient populations, iodine intake restoration is associated with measurable clinical outcomes, including enhanced thyroid function biomarkers and cognitive performance in children. Similarly, vitamin K2 from cheonggukjang plays a pivotal role in the γ-carboxylation of vitamin K–dependent proteins, such as osteocalcin and MGP, thereby influencing bone mineralization and vascular calcification. These effects can be monitored using biomarkers, including undercarboxylated osteocalcin and vascular stiffness indices.
Furthermore, fermentation-derived probiotics from kimchi contribute to gut microbiota modulation, enhancing intestinal barrier function and nutrient absorption. This is particularly relevant in LMICs, where environmental enteric dysfunction and chronic inflammation reduce nutrient bioavailability. Enhanced gut integrity and microbial balance are associated with increased absorption of micronutrients, such as iron and zinc, as well as inflammatory marker reductions. Collectively, these mechanisms suggest that K-foods function both as nutrient sources and modulators of metabolic and physiological pathways underlying hidden hunger. Essentially, these effects can be evaluated using measurable clinical endpoints, including biochemical biomarkers, functional health outcomes, as well as growth and cognitive indicators, consistent with the framework of clinical nutrition research.
Clinically, these foods address several limitations commonly encountered in micronutrient interventions among vulnerable populations. Gim is a concentrated dietary source of iodine, iron, and B vitamins, which are crucial for thyroid function, hematopoiesis, and neurodevelopment—particularly relevant for pregnant women and children in regions with iodine and iron deficiencies. Fermented foods, such as kimchi and cheonggukjang, provide probiotics, vitamin K2, and fermentation-derived bioactive peptides, which may enhance intestinal barrier function, modulate gut microbiota composition, and improve nutrient absorption. These properties are particularly important in LMIC populations affected by recurrent infections, environmental enteric dysfunction, and chronic low-grade inflammation, which often diminish the clinical effectiveness of conventional supplementation.
The proposed stepwise research roadmap offers a clinically oriented pathway for translating these food-based concepts into evidence-generating interventions. Sequential processes—including standardized food composition analysis, safety and stability assessments, cultural acceptability evaluation, and community-based efficacy trials—closely align with established principles of clinical nutrition research. Essentially, the framework highlights a shift from laboratory-defined efficacy to contextual clinical effectiveness, acknowledging that adherence, acceptability, and real-world dietary integration are important determinants of nutritional outcomes. By incorporating mixed-methods evaluation and stakeholder engagement, the model supports clinically relevant endpoints, such as improvements in nutrient status biomarkers, functional health indicators, and dietary compliance.
Beyond its clinical implications, this research note highlights intersections with food technology and industrial nutrition. The high nutrient density and functional properties of K-foods make them promising components of medical nutrition and functional food portfolios, particularly in emerging global markets focused on plant-based, fermented, and microbiome-supportive products. Advances in fermentation control, product standardization, and safety verification can further improve their suitability for clinical and public health nutrition applications while supporting innovation within the functional food sector.
At the policy level, this clinically grounded model supports Korea’s evolving role in global health nutrition by showing how culturally rooted foods can be translated into scalable, evidence-based nutrition interventions. The integration of validated K-foods into ODA nutrition pathways—such as maternal supplementation programs, school feeding initiatives, or community-based malnutrition prevention strategies—provides an opportunity to align clinical nutrition objectives with broader goals of nutritional equity, food system resilience, and ethical development cooperation. Collectively, this approach reframes food-based ODA as more than simple caloric support, positioning it instead as a clinically informed strategy to improve micronutrient status and functional health outcomes in nutritionally vulnerable populations.
CONCLUSION
This research note highlights the clinical potential of selected traditional K-foods—gim, kimchi, and cheonggukjang—as strategies for enhancing micronutrient status in LMICs. By moving beyond single-nutrient supplementation, the proposed framework emphasizes multinutrient dietary interventions that may improve bioavailability, gut health, and long-term adherence in resource-limited settings. The stepwise roadmap highlights clinically relevant considerations, such as nutrient standardization, safety and stability, cultural acceptability, and community-level effectiveness. The integration of validated K-foods into nutrition-sensitive ODA programs provides a pragmatic and scalable approach to addressing micronutrient deficiencies while supporting sustainable improvements in population health.
NOTES
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Authors’ contributions
Conceptualization: all authors. Formal analysis: SC. Investigation: SC. Methodology: JMC. Data curation: SC. Supervision: JMC. Validation: JMC. Writing - original draft: all authors. Writing - review & editing: all authors. All authors read and approved the final manuscript.
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Conflicts of interest
None.
-
Funding
This research was supported by the Regional Innovation System & Education(RISE) program through the Gyeongbuk RISE CENTER, funded by the Ministry of Education (MOE) and Gyeongsangbuk-do, Republic of Korea, as part of a local-tailored R&D sub-project (2026-RISE-15-110).
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Data availability
Data of this research are available from the corresponding author upon reasonable request.
Table 1.Nutritional composition and nutrition-related functional roles of selected traditional Korean foods with potential application in food-based official development assistance programs [
37]
Table 1.
|
K-food |
Key nutrient |
Representative content (/100 g) |
Documented functional role |
|
Gim (dried seaweed) |
Iodine |
2,930–4,580 μg |
Essential for thyroid hormone synthesis (T3, T4); supports basal metabolic regulation and fetal/early-life neurodevelopment |
|
Calcium |
Approximately 625 mg |
Contributes to bone mineralization and is involved in neuromuscular transmission and vascular smooth muscle function |
|
Kimchi (fermented vegetables) |
Probiotics (lactic acid bacteria) |
>108 CFU/g |
Modulation of gut microbiota composition; enhancement of intestinal barrier function; support of mucosal immune responses |
|
Dietary fiber |
Approximately 1.6 g |
Regulation of intestinal transit; attenuation of postprandial glycemic response; contribution to lipid metabolism and satiety |
|
Cheonggukjang (fermented soybean paste) |
Vitamin K2 (menaquinone-7) |
Approximately 800–1,000 μg |
Activation of vitamin K–dependent proteins (e.g., osteocalcin and matrix Gla protein); support of bone metabolism and vascular health |
|
Bioactive peptides/proteins |
Approximately 17 g |
Provision of essential amino acids; generation of fermentation-derived peptides with antioxidant, anti-inflammatory, and blood pressure–modulating properties |
Table 2.Proposed five-step research framework for integrating traditional K-foods into food-based ODA nutrition strategies
Table 2.
|
Step |
Research focus |
Key activity |
Expected output/goal |
|
Step 1 |
Nutrient profiling and food composition standardization |
Comprehensive nutrient analysis using standardized protocols |
Validated and reproducible food composition data suitable for international reference and comparative nutrition research |
|
Quantification of bioavailable micronutrients |
|
Assessment of batch-to-batch variability and processing effects |
|
Step 2 |
Safety, stability, and packaging assessment |
Evaluation of microbial safety and allergenicity |
Identification of safe, stable, and logistically feasible product formulations for ODA deployment |
|
Shelf life and stability testing under tropical and low-refrigeration conditions |
|
Optimization of packaging formats for long-distance distribution |
|
Step 3 |
Cultural acceptability and dietary adaptation |
Qualitative studies on sensory acceptance and culinary compatibility |
Culturally appropriate adaptation strategies that enhance acceptance and minimize resistance |
|
Small-scale pilot trials in LMICs |
|
Co-creation workshops with local stakeholders to guide food adaptations |
|
Step 4 |
Nutritional impact evaluation |
Community-based pilot interventions in high-risk populations (e.g., children and pregnant women) |
Field-based evidence of nutritional efficacy, feasibility, and real-world impact |
|
Assessment of dietary intake, biomarkers, and selected health outcomes (pilots) |
|
Mixed-methods evaluation of biological and social impacts |
|
Step 5 |
Policy translation and ODA program integration |
Synthesis of research findings into policy-relevant recommendations |
Scalable, export-ready K-food-based nutrition support model consistent with SDG 2 and global food security frameworks |
|
Collaboration with ODA stakeholders (e.g., KOICA, WFP, FAO) |
|
Design of modular program models for school feeding, maternal nutrition, or emergency aid |
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