Food preservatives and child health: Mechanisms, clinical concerns, and safe consumption practices for modern families

*Corresponding author: Venugopal Reddy.I. Copyright © 2025 Author(s) retain the copyright of this article. This article is published under the terms of the Creative Commons Attribution License 4.0. Food preservatives and child health: Mechanisms, clinical concerns, and safe consumption practices for modern families Venugopal Reddy.I * Department of Pedaitrics, Ovum Woman and Child Speciality Hospital, Banaglore, India. World Journal of Biology Pharmacy and Health Sciences, 2025, 24(02), 392–402 Publication history: Received on 03 October 2025; revised on 13 November 2025; accepted on 15 November 2025 Article DOI: https://doi.org/10.30574/wjbphs.2025.24.2.1013 Abstract Processed and packaged foods have become integral to modern dietary patterns, especially among children. Food preservatives used to enhance shelf-life, prevent spoilage, and maintain product quality carry potential biological effects that raise increasing concern. Children are physiologically more vulnerable to chemical exposures due to their developing organ systems, higher metabolic rate, and lower body weight. This review evaluates the types and mechanisms of commonly used food preservatives, summarises their potential impacts on child health, highlights evidence from toxicological and clinical studies, and provides practical guidelines for parents and clinicians. The article also examines regulatory standards, acceptable daily intake (ADI) limits, and the cumulative exposure risk in children. Finally, it outlines safe consumption practices and future strategies for reducing preservative-related risks within families and communities. Keywords: Food preservatives; Child health; Benzoates; Nitrites; Sulphites; Propionates; BHA/BHT; Microbiome; Endocrine disruption; Ultra-processed foods. 1. Introduction Food preservatives play a critical role in modern food systems by reducing microbial spoilage, enhancing safety, and enabling widespread food distribution. However, the rapid growth of ultra-processed foods (UPFs) has increased children’s exposure to synthetic preservatives far beyond what existed in previous generations. The WHO and UNICEF have expressed repeated concerns about children's increasing intake of processed foods, which may contribute to rising rates of obesity, behavioural problems, allergic disorders, and metabolic dysfunctions (1). Children differ physiologically from adults. Their gut microbiome, immune system, neurological pathways, and detoxification mechanisms are still developing, making them more susceptible to even low-dose chemical exposures. The potential associations between preservatives such as benzoates, nitrites, sulphites, propionates, and synthetic antioxidants and hyperactivity, asthma, endocrine disruption, and carcinogenesis require careful examination (2). This review synthesises current scientific evidence on food preservatives and child health, presenting a balanced, evidence-based perspective aligned with global public health goals. World Journal of Biology Pharmacy and Health Sciences, 2025, 24(02), 392–402 393 2. Classification of Food Preservatives 2.1. Chemical Preservatives These are artificially produced compounds widely used across food industries. 2.1.1. Benzoates (E210–E213) • Used in: soft drinks, juices, pickles, syrups • Function: inhibit yeast and mould • Concerns: hyperactivity, skin allergies, benzene formation in presence of vitamin C (3) 2.1.2. Sorbates (E200–E203) • Used in: bakery items, cheese, sauces • Function: anti-fungal • Concerns: mild skin irritation, rare allergic reactions 2.1.3. Nitrites and Nitrates (E249–E252) • Used in: processed meats • Function: prevent Clostridium botulinum • Concerns: nitrosamine formation, methemoglobinemia, potential carcinogenicity (4) 2.1.4. Propionates • Used in: bread and baked goods • Function: inhibit mould • Concerns: possible link to insulin resistance and behavioural changes (5) 2.1.5. Sulphites (E220–E228) • Used in: dried fruits, juices • Function: antioxidant and antimicrobial • Concerns: asthma exacerbation, anaphylaxis in sensitive individuals (6) 2.1.6. BHA (E320) and BHT (E321) • Used in: snacks, cereals, oils • Function: synthetic antioxidants • Concerns: endocrine disruption, carcinogenic potential (7) 2.1.7. Parabens • Used in: beverages, syrups, confectionery • Concerns: estrogenic activity, endocrine disruption 2.1.8. EDTA compounds • Used in: dressings, canned foods • Function: stabiliser and preservative • Concerns: heavy metal chelation affecting micronutrient levels 2.2. Natural Preservatives • Salt • Sugar • Vinegar • Lemon juice • Rosemary extract • Fermentates • Essential oils World Journal of Biology Pharmacy and Health Sciences, 2025, 24(02), 392–402 394 Natural preservatives are generally safer, with minimal adverse effects when consumed normally. 2.3. Physical Preservation Techniques • Pasteurisation • High-pressure processing • Irradiation • Ultrasonic preservation These methods do not introduce chemicals but may alter nutritional profiles. 3. Mechanisms of Action of Food Preservatives Preservatives act through several molecular mechanisms: 3.1. Disruption of Microbial Cell Walls Benzoates and sorbates enter microbial cells, acidify cytoplasm, and inhibit enzyme activity. 3.2. Inhibition of Enzyme Function Sulfites disrupt essential microbial enzymes involved in metabolism. 3.3. Oxidative Stress Induction BHA and BHT act as antioxidants in food but may induce ROS in mammalian cells (8). 3.4. Formation of Toxic By-products • Nitrites react with amines to form nitrosamines, known carcinogens. • Benzoates may form benzene under specific conditions. 3.5. Microbiome Modulation Propionates and sulfites can reduce beneficial gut bacteria, altering immune and metabolic functions. 4. Metabolism of Preservatives in Children Children metabolise preservatives differently because: 4.1. Immature Liver Enzymes Cytochrome P450 pathways not fully developed until adolescence. 4.2. Higher Absorption Higher gastric pH in infants → increased absorption of certain chemicals. 4.3. Slower Detoxification Glucuronidation and sulfation pathways underdeveloped. 4.4. Gut Microbiome Differences Altered metabolism of additives and their metabolites. Thus, the same preservative dose can produce higher biological effects in a child compared to an adult (9). World Journal of Biology Pharmacy and Health Sciences, 2025, 24(02), 392–402 395 5. Evidence-Based Side Effects of Food Preservatives 5.1. Behavioural and Neurological Effects 5.1.1. Benzoates and Hyperactivity A landmark randomised controlled trial linked benzoates and artificial colours with increased hyperactivity in children (10). Many subsequent studies confirm similar associations. 5.1.2. Propionates & Behavioural Irritability Propionic acid can cross the blood–brain barrier; animal studies show neuroinflammation and behavioural abnormalities (11). 5.2. Respiratory Effects Sulphites and Asthma Sulfites can trigger bronchoconstriction, particularly in children with pre-existing asthma (12). 5.3. Gastrointestinal Effects • Alteration of gut microbiota • Increased intestinal permeability • Chronic low-grade inflammation Nitrites and benzoates may impair antioxidant status within the gut. 5.4. Endocrine Disruption BHA and BHT have hormone-modulating activity, influencing thyroid and reproductive hormones (13). Parabens show estrogenic activity, potentially affecting early puberty. 5.5. Hematological and Carcinogenic Effects • Nitrites → methemoglobinemia in infants • Nitrosamines → colorectal cancer risk (14) • BHA and BHT → classified as possibly carcinogenic in animals 5.6. Allergic Reactions Common triggers: • Sulphites → hives, wheezing • Benzoates → urticaria • Parabens → rare dermatitis 6. Preservative-Specific Detailed Evaluations 6.1. Benzoates • Common in beverages • Associated with hyperactivity, urticaria, and benzene formation • Higher risk when combined with vitamin C (15) World Journal of Biology Pharmacy and Health Sciences, 2025, 24(02), 392–402 396 6.2. Nitrites and Nitrates • WHO classified nitrites in processed meats as probable carcinogens • Linked to juvenile cancer risk • Increased risk in infants due to higher NO2– sensitivity 6.3. Sulphites • Can trigger severe asthma in sensitive children • Alters gut bacteria such as Lactobacillus species (16) 6.4. Propionates • May increase insulin resistance • Associated with anxiety-like behaviours in some studies (17) 6.5. BHA and BHT • Endocrine-disrupting effects • Long-term carcinogenic concerns Table 1 Summary of Common Food Preservatives, Their Functions, and Child Health Concerns Preservative (ENumber) Common Food Sources Primary Function / Mechanism Potential Health Concerns in Children Benzoates (E210–E213) Soft drinks, juices, pickles, syrups Inhibit yeast and mould by cytoplasmic acidification Hyperactivity, urticaria, benzene formation with vitamin C Sorbates (E200–E203) Cheese, bakery items, sauces Anti-fungal; inhibit microbial enzymes Mild allergy; usually low toxicity Nitrites/Nitrates (E249– E252) Processed meats Prevent C. botulinum; convert to nitric oxide Nitrosamines (carcinogenic), methemoglobinemia, gut dysbiosis Sulphites (E220–E228) Dried fruits, juices, beverages Antioxidant and antimicrobial; inhibit bacterial enzymes Asthma exacerbation, anaphylaxis, microbiome disruption Propionates (E280–E283) Bread, buns, cakes Anti-mould; disrupt mitochondrial processes Insulin resistance, behavioural changes, neuroinflammation BHA (E320) Cereals, snacks, oils Synthetic antioxidant preventing rancidity Endocrine disruption; possible carcinogenicity BHT (E321) Cereals, chips, chewing gum Synthetic antioxidant Hormonal modulation, potential neurotoxicity Parabens Beverages, syrups, confectionery Antifungal and antibacterial Estrogenic effects; early puberty concerns EDTA compounds Dressings, canned foods, mayonnaise Metal-chelating stabilisers May reduce micronutrient absorption Formaldehyde derivatives Some imported processed foods Broad antimicrobial action Carcinogenic potential (chronic exposure) TBHQ Instant noodles, frozen foods Prevents lipid oxidation Immunotoxicity (animal studies) Natural preservatives (salt, sugar, vinegar, lemon) Homemade foods, pickles, jams Dehydrate microbes, reduce pH Generally safe; excess sugar/salt has metabolic risks World Journal of Biology Pharmacy and Health Sciences, 2025, 24(02), 392–402 397 Nisin, Natamycin Cheese, dairy Natural antimicrobial peptides Very low toxicity; WHO approved Essential oils (rosemary, oregano, clove) Clean-label and organic products Natural antimicrobial activity Safe at low intake; high doses may cause GI irritation High-pressure processing (HPP) Juices, ready-to-eat foods Deactivates microbes without chemicals Safe, preserves nutrients effectively 7. Impact of Preservatives on the Gut Microbiome A growing body of research shows that: 7.1. Sorbates and benzoates decrease beneficial bacteria such as • Lactobacilli • Bifidobacteria 7.2. Sulphites inhibit bacterial enzymes, reducing microbial diversity (18) 7.3. Altered microbiome affects: • Immunity • Metabolism • Behaviour • Allergic susceptibility This may partly explain increasing rates of childhood allergies and obesity. 8. How to Identify Preservatives in Food Labels 8.1. Understanding E-Numbers A standardised system used globally: • E200–E290 → preservatives • E100–E199 → colours • E300–E399 → antioxidants 8.2. Hidden Sources • Bakery items • Chips & savouries • Flavored milk & ice creams • Packaged juices • Cereal bars • Instant noodles & soups • Children’s health drinks • Pickles & sauces Parents should be advised to look for: “Potassium sorbate, sodium benzoate, sodium nitrate, sulphites, propionate, BHA/BHT.” World Journal of Biology Pharmacy and Health Sciences, 2025, 24(02), 392–402 398 9. Regulatory Standards Table 2 Acceptable Daily Intake (ADI) of Common Food Preservatives (JECFA/WHO Standards) Preservative ADI (mg/kg body weight/day) Regulatory Notes Benzoic acid & salts 0–5 Risk of benzene formation in beverages containing vitamin C Sorbic acid & salts 0–25 Considered low toxicity at permitted levels Nitrites 0–0.07 Strict limits due to nitrosamine formation Nitrates 0–3.7 Exposure from vegetables usually safe; processed meats riskier Sulphites (SO₂) 0–0.7 Risk of asthma and allergic reactions in sensitive children Propionic acid & salts Not specified (GRAS) Recent studies suggest metabolic and behavioural concerns BHA 0–0.5 Potential endocrine disruption at higher doses BHT 0–0.3 Allowed in limited amounts in oils & cereals TBHQ 0–0.7 Animal studies show immunotoxicity at high doses Parabens Up to 10 mg/kg EFSA has stricter limits for infants Nisin 0–2.9 Considered safe; widely used in dairy Natamycin 0–0.3 Minimal systemic absorption 9.1. WHO/FAO – JECFA ADI Levels • Benzoic acid → 0–5 mg/kg/day • Sorbic acid → 0–25 mg/kg/day • Nitrites → 0–0.07 mg/kg/day • BHA → 0–0.5 mg/kg/day 9.2. FSSAI (India) Regulations • Sets maximum permissible levels • Mandatory labelling • Strict limits for nitrites/nitrates in meat 9.3. FDA (USA) • Classifies some preservatives as GRAS • Requires proof of safety at intended usage levels 9.4. EFSA (Europe) • Stricter than US • Several re-evaluations of benzoates, sulphites, and BHA/BHT in recent years World Journal of Biology Pharmacy and Health Sciences, 2025, 24(02), 392–402 399 Table 3 Global Regulatory Standards for Food Preservatives (Comparison: WHO/JECFA, FSSAI, FDA, EFSA) Preservative WHO/JECFA FSSAI (India) FDA (USA) EFSA (Europe) Benzoates ADI: 0–5 mg/kg Permitted; strict limits for beverages GRAS Re-evaluated; tightened limits for children Sorbates ADI: 0–25 mg/kg Widely allowed GRAS Considered safe but under periodic review Nitrites ADI: 0–0.07 mg/kg Strict limits in processed meats Permitted with limits Strongest restrictions among all regions Nitrates ADI: 0–3.7 mg/kg Restricted use Permitted Re-evaluated frequently due to cancer concerns Sulphites ADI: 0–0.7 mg/kg Mandatory labelling if >10 ppm GRAS but must be declared Warning labels recommended Propionates No ADI set Common in bakery items GRAS Allowed but under ongoing review BHA ADI set Limited use in oils Allowed with restrictions Evaluated for endocrine effects BHT ADI set Allowed in processed foods GRAS Lower limits for infant foods TBHQ ADI: 0–0.7 mg/kg Permitted in oils and fats GRAS Conservative limits due to immunotoxicity concerns Parabens Limited ADI Very restricted Permitted in low concentrations Stricter rules for infants Natural preservatives No ADI required Allowed Allowed Allowed 9.5. Real-World Exposure in Children Studies show that children often exceed ADI for certain preservatives because: 9.6. Multiple processed foods consumed daily → Cumulative exposure higher than measured per-item levels. 9.7. Smaller body weight → Higher mg/kg exposure. 9.8. Preference for snacks and packaged foods → Increases intake of sorbates, benzoates, and propionates. World Journal of Biology Pharmacy and Health Sciences, 2025, 24(02), 392–402 400 10. Safe Consumption Practices for Modern Families Figure 1 Evidence-Based Strategies to Reduce Preservative Intake in Children START │ ▼ 1. IDENTIFY COMMON SOURCES - Packaged snacks - Fruit drinks/juices - Bakery buns, breads - Instant foods & noodles - Sausages/processed meats │ ▼ 2. READ INGREDIENT LABELS Look for: - Sodium benzoate - Potassium sorbate - Nitrite/Nitrate - Sulphites (E220–E228) - Propionate - BHA/BHT │ ▼ 3. LIMIT OR AVOID HIGH-RISK PRESERVATIVES - Nitrites in processed meats - Sulphites in dried fruits - Benzoates in beverages - Propionates in buns/bread │ ▼ 4. SUBSTITUTE WITH SAFER OPTIONS