Nutritional value and safety risks of fruits and vegetables: An integrated review

Vulnerable populations, including children, the elderly and immune compromised individuals, are disproportionately affected by such contamination. Within India, regional agricultural practices intensify these risks. In Rajasthan, extensive use of fertilizers and pesticides to counter arid soils and enhance productivity has been linked to residues exceeding recommended safety limits (Yadav, 2023) [35] . Industrial and mining activities further contribute to heavy metal contamination of soil and water, which in turn affects crops and consumers (Chauhan and Sharma, 2025) [2] . Wholesale markets, while socio-economically vital, often lack adequate infrastructure, sanitary facilities, and regulatory enforcement, creating an environment conducive to contamination (Jairath and Purohit, 2025) [12] . The public health implications of consuming contaminated produce are profound, ranging from acute gastrointestinal illness to chronic conditions such as cancer and neurological disorders (Sutradhar, 2024) [30] . Despite the scale of the problem, systematic studies that integrate nutritional quality, contaminant levels, and health risks remain limited. This review therefore aims to synthesize existing evidence on the safety of fruits and vegetables in wholesale markets, with particular reference to contamination pathways, health outcomes, and regulatory challenges. By consolidating current knowledge, the review seeks to highlight gaps in research, inform policy development, and propose strategies for strengthening food safety standards.

Review of Literature

Fruits and leafy vegetables are rich in vitamins, minerals, fiber, and phyto chemicals that promote immunity, cardiovascular health, and disease prevention. Their bioavailability is influenced by anti nutritional factors and preparation methods, while phyto chemicals such as flavonoids and carotenoids provide antioxidant and chemo preventive effects. Despite nutritional benefits, contamination risks persist across supply chains due to pesticide residues, heavy metals, and microbial pathogens. Chronic pesticide exposure is linked to endocrine disruption and carcinogenesis, while heavy metals like lead and cadmium bioaccumulation, causing renal, neurological, and developmental disorders. Microbial hazards including E. coli and Salmonella further compromise food safety under poor sanitation and storage. Collectively, the literature highlights the dual role of fruits and vegetables as essential for health yet vulnerable to contamination, necessitating stricter regulation, sustainable practices, and improved infrastructure.

Nutritional and Functional Roles of Fruits and Leafy Vegetables

Fruits and leafy vegetables are indispensable in human nutrition, serving as reservoirs of vitamins, minerals, dietary fiber, and bioactive compounds that collectively sustain physiological well-being and reduce chronic disease risk. Micronutrients such as vitamin A, C, and E, along with iron, calcium, magnesium, and potassium, play critical roles in immune defense, collagen synthesis, antioxidant protection, hemoglobin formation, bone mineralization, and cardiovascular regulation (Table 1). Their bioavailability is influenced by anti nutritional factors (oxalates, phytates) and preparation methods, with evidence showing that vitamin C enhances iron absorption and dietary fats improve carotenoids uptake (Pathak, 2022; Devirgiliis et al., 2024) [21, 5] .

Phytochemicals

including flavonoids, carotenoids, polyphenols, glucosinolates, and phytosterols exhibit antioxidant, anti inflammatory and chemo preventive properties. Lutein and zeaxanthin protect against age related macular degeneration, while polyphones modulate oxidative stress pathways implicated in cancer and neurodegenerative disorders (Have a Plant, 2026) [11] (Fig. 1). Dietary fiber contributes to glycemic control, cholesterol reduction, and gastrointestinal health, reinforcing the role of fruits and vegetables in preventing non communicable diseases (WHO, 2023). Improves iron absorption in vegetarian diets FAO, 2020 [8] Vitamin E Nuts, leafy greens

Antioxidant protection, immune modulation

Requires lipid medium for absorption

Lowers oxidative stress, reduces inflammation

Important in aging populations Komal Sharma and Meena, 2023 [26] Iron [33,22] . Wholesale markets often lack proper sanitation and waste management, compounding risks. These systemic weaknesses highlight the need for integrated monitoring, vendor training, and adoption of modern technologies such as block chain traceability.

Toxicological Perspectives on Pesticide Residues

Pesticide residues remain a pressing toxicological concern. Chronic ingestion has been linked to endocrine disruption, neurotoxicity, reproductive impairment, and carcinogenesis. Organo chlorines persist in adipose tissue, while organophosphates inhibit acetyl cholinesterase activity, leading to neurological dysfunction. Recent reviews confirm that pesticide residues in fruits and vegetables can offset the health benefits of consumption, particularly when residues exceed permissible limits (Bansal, 2023; Sandoval-Insausti et al., 2022; WHO, 2022) [1,25,33] .

Heavy Metal Contamination in Agricultural Produce

Heavy metals such as lead, cadmium, arsenic, and mercury are non biodegradable and accumulate in soil, water, and crops. Industrial effluents, fertilizers, and wastewater irrigation contribute significantly to contamination pathways. Chronic exposure has been associated with nephrotoxicity, hepatotoxicity, neurodegenerative disorders, and carcinogenesis. Recent studies emphasize seasonal variability in contamination, with higher accumulation during monsoon driven runoff (Kamal and Yadav, 2026; Rashid et al., 2023) [16,24] . Mitigation strategies include phytoremediation, stricter enforcement of permissible limits, and sustainable agricultural practices.

Microbial Hazards in Fruits and Vegetables

Fresh produce provides an ideal environment for microbial colonization due to high moisture and nutrient content. Pathogens such as E. coli O157:H7, Salmonella spp., and Listeria mono cyto genes contaminate crops through wastewater irrigation and poor sanitation. Post-harvest handling and inadequate storage amplify risks, while outbreaks of food borne illness continue to be linked to contaminated produce (FAO and WHO, 2023; Food Safety News, 2023) [6,9] . Preventive measures such as good agricultural practices (GAPs), hygiene protocols, and hazard analysis systems remain essential. [17,29] Salmonella spp.

Tomatoes, melons, papayas

Soil, water, poor handling practices

Gastroenteritis, systemic infection

All populations US tomato outbreak (2008) Patel and Desai, 2020; Sharma et al., 2021 [20,28] Listeria monocytogenes Singh and Meena, 2022 [28,29] Hepatitis [20,3]

Ready

Cyclospora cayetanensis

Basil, lettuce, raspberries Wastewater irrigation, poor sanitation Prolonged diarrhea, fatigue

Immunocompromised individuals

US imported basil outbreak (2019)

Rao and Verma, 2019; Singh and Meena, 2022 [23,29]

Giardia lamblia

Irrigation with untreated wastewater

Gastrointestinal illness, mal absorption

Children, immunocompromised South Asian vegetable studies Gupta and Meena, 2020; Sharma et al., 2021 [10,28] Cryptosporidium spp. Chauhan and Yadav, 2021; Patel and Desai, 2020 [3,20] Shigella spp.

Spinach, lettuce, herbs

Leafy greens, carrots

Poor hygiene during handling Dysentery, fever, abdominal cramps Children, elderly India vegetable outbreaks Kumar et al., 2021; Rao and Verma, 2019 [17,23] Clostridium perfringens Parihar and Choudhary, 2023 [18]

Cooked

Conclusion

Fruits and leafy vegetables remain indispensable for human health, offering a wide spectrum of micronutrients, dietary fiber, and phyto chemicals that collectively reduce the burden of chronic diseases. However, the literature consistently demonstrates that their nutritional benefits are undermined by contamination risks across the supply chain. Pesticide residues, heavy metals, and microbial pathogens pose significant toxicological and epidemiological concerns, with documented links to endocrine disruption, carcinogenesis, renal and neurological disorders, and widespread food borne illnesses. The dual role of fruits and vegetables as essential for nutrition yet vulnerable to contamination underscores the urgent need for integrated interventions. Stricter regulatory enforcement, investment in hygienic infrastructure, adoption of sustainable agricultural

Acknowledgement

AcknowledgementThe authors are thankful to University of Technology, Jaipur, Rajasthan, India for providing infrastructural facility to conduct the research. Data availability:All the data is provided with in the manuscript.

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