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Coppola, S.; Carucci, L.; Oglio, F.; Di Sarra, C.; Ozen, G.; Berni Canani, R. Cow’s Milk Allergy Preventive Nutritional Strategies. Encyclopedia. Available online: https://encyclopedia.pub/entry/48063 (accessed on 27 July 2024).
Coppola S, Carucci L, Oglio F, Di Sarra C, Ozen G, Berni Canani R. Cow’s Milk Allergy Preventive Nutritional Strategies. Encyclopedia. Available at: https://encyclopedia.pub/entry/48063. Accessed July 27, 2024.
Coppola, Serena, Laura Carucci, Franca Oglio, Claudia Di Sarra, Gulsum Ozen, Roberto Berni Canani. "Cow’s Milk Allergy Preventive Nutritional Strategies" Encyclopedia, https://encyclopedia.pub/entry/48063 (accessed July 27, 2024).
Coppola, S., Carucci, L., Oglio, F., Di Sarra, C., Ozen, G., & Berni Canani, R. (2023, August 15). Cow’s Milk Allergy Preventive Nutritional Strategies. In Encyclopedia. https://encyclopedia.pub/entry/48063
Coppola, Serena, et al. "Cow’s Milk Allergy Preventive Nutritional Strategies." Encyclopedia. Web. 15 August, 2023.
Cow’s Milk Allergy Preventive Nutritional Strategies
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This entry is adapted from the peer-reviewed paper 10.3390/nu15153328

Cow’s milk allergy (CMA) is one of the most common pediatric food allergies. The prevalence and severity of CMA have increased dramatically in the last decades, under the pressure of environmental factors in genetically predisposed individuals. Among the environmental influences, nutritional factors play a crucial role. Diet is the most modifiable factor, representing a potential target for the prevention and treatment of CMA.

food allergy gut microbiome immunonutrition

1. Introduction

Cow’s milk allergy (CMA) is one of the most common pediatric food allergies (FAs), affecting up to 3% of the children population. CMA derives from a breakdown of immune tolerance against cow’s milk proteins (α-lactalbumin, β-lactoglobulin, serum albumin, caseins, bovine serum albumins and others) that generally occurs in the first years of life [1]. Commercial milk is subjected to a heat treatment process to make it sterile, which through the Maillard reaction can induce the formation of deleterious compounds, such as the advanced glycation end products Nε-(carboxyethyl) lysine, Nε-(carboxymethyl) lysine, pentosidine, pyrraline, methylglyoxal-lysine dimer, glyoxal-lysine dimer and argpyrimidine, that may play a role in the pathogenesis of allergies [2]. CMA may present different phenotypes based on the immune mechanisms: IgE mediated, non-IgE mediated or mixed [1]. Infants with IgE-CMA may present from gastrointestinal (i.e., vomiting and diarrhea), cutaneous (i.e., erythema, urticarial and angioedema), respiratory and/or systemic symptoms up to the most severe reaction anaphylaxis, occurring within 2 h after cow’s milk exposure. Non-IgE-CMA is characterized by subacute or chronic gastrointestinal symptoms and affected infants may present bloody stools, delayed vomiting, crying and chronic diarrhea with the risk of malnutrition and failure to thrive [1]. The diagnosis of CMA requires a positive oral food challenge to cow’s milk protein; that is the gold standard test to confirm CMA [3][4]. The type and the severity of CMA symptoms dramatically worsened in the last years, as well the epidemiology picture showed an increase in CMA prevalence and persistence [5][6]. Several hypotheses have been postulated to explain the spread of CMA in the last years and the most likely one seems related to an impaired gene-environment interaction [6][7]. Some dietary habits (i.e., the Western diet), infections, cesarean delivery, formula consumption in the first week of life and the massive use of drugs in the first stage of life have been proposed as the main environmental factors responsible for the occurrence of FAs, including CMA [8][9][10]. Indeed, operating on an unfavorable genetic background, these factors impair the gut microbiome (GM), with consequent alterations of the GM-immune system axis. The perturbation of this axis could lead to a breakdown of immune tolerance and to CMA occurrence [9][10]. On the other hand, the Mediterranean diet, vaginal delivery and breastfeeding could positively modulate the axis and may represent an innovative approach to prevent and treat GM-immune system-derived diseases, such as CMA [9][10][11]. Among the environmental factors, diet represents one of the main modifiable ones. Since dietary habits have a role in eliciting potentially negative or positive effects in CMA occurrence, nutritional modulation could be considered an effective target for the prevention and management of CMA. The potential to influence the immune system functionality of selected dietary habits has been described with the term “immunonutrition” that, in the FA field, is based on a proactive approach focused on the prevention and the acquisition of immune tolerance in allergy treatment [12].

2. Cow’s Milk Allergy Preventive Nutritional Strategies

The alarming increasing rate of CMA prevalence advocates the necessity for effective preventive nutritional strategies against the disease burden.
The CMA’s primary prevention should start from the prenatal period, focusing on a maternal healthy lifestyle and food diversity during pregnancy [13]. Maternal diet during pregnancy has been considered a potential target for allergy prevention. Maternal diet may affect, through direct or indirect mechanisms, infant GM, which is associated with a range of allergy outcomes [13][14][15]. High adherence to the Mediterranean diet has been reported to increase GM diversity [16]. Thus, a maternal diet rich in Mediterranean diet-based foods, including vegetables and yogurt, was associated with protective effects for offspring allergies [17]. On the contrary, dietary intake of Western heat-processed foods high in advanced glycation end products (e.g., fried foods, red and processed meat and fruit juice), has been associated with a reduced diversity of GM and the occurrence of pediatric allergies [2]. In addition, the maternal avoidance of allergenic solids foods during pregnancy and lactation have been considered ineffective for CMA prevention and no recommendation by international guidelines have been provided [8]. Indeed, the maternal intake of allergenic solids foods during pregnancy could ensure the placental transmission of inhibitory IgG- allergen immune complexes, reducing the risk of pediatric allergy occurrence [18][19]. Furthermore, no international recommendations for or against the use of prebiotics, probiotics or synbiotics during breastfeeding and lactation alone or in combination with other approaches to prevent pediatric allergies have been formulated [8].
Through a positive modulation of the GM and the proper development of the immune system during infancy, breastfeeding is the first nutritional postnatal factor able to protect against allergy occurrence [20]. Several protective mechanisms of breastfeeding have been proposed. Breast milk has anti-allergic immune properties and contains a large amount of biologically active compounds, including lysozyme, lactoferrin, immunoglobulins (Ig)A, IgM, cytokines, nucleotides, microRNAs and hormones that provide passive immunity and could induce oral tolerance to food antigens [21][22][23]. Among the most abundant protective component of breast milk, are the human milk oligosaccharides (HMOs) and prebiotics, resulting in the production of sub-products such as lactate and short-chain fatty acids (SCFAs) and metabolites, able to modulate the immune system function [24]. In particular, the SCFA butyrate enhances the suppressive capacity of regulatory T cells (Treg), suppressing the allergic response and sustaining immune tolerance to allergens in the offspring [25][26]. Butyrate in human milk modulates the mechanisms of immune tolerance, including the increase in biomarkers of gut barrier integrity and tolerogenic cytokines in concentrations able to protect against allergy occurrence [27]. Nevertheless, due to the low certainty of evidence, no recommendations for or against using breastfeeding to prevent food allergy or CMA have been provided at the European level [8]. Thus, considering the multiple benefits for infants and mothers, breastfeeding should be encouraged wherever possible, as stated by most scientific society guidelines [28]. Notably, guidelines from the European Academy of Allergy and Clinical Immunology (EAACI) recommend avoiding supplementation with cow’s milk formula in the first week of life. Other possible temporary supplementary options for breastfed infants could include donor breast milk, amino acid or hydrolyzed formula [8]. Regarding the introduction of complementary foods in infants’ diets for allergy prevention, the European guidelines recommend the importance of not avoiding the intake of potentially allergenic foods during weaning, emphasizing that there is no reason for delaying their introduction after 12 months nor for an early introduction <4 months [29]. Evidence supports the role of early exposure to potential allergens in the development of immune tolerance [30][31]; indeed, the regular ingestion of food allergens between 4 and 6 months of life can lead to immune tolerance and alter the immunological responses to food antigens; conversely, the skin passage of food antigens in the condition of inflammation, before the achievement of immune tolerance, can lead to sensitization to food allergens [32]. In addition, the infants’ diet, influencing the GM composition and function, could have a pivotal role in protecting against the occurrence of food allergy. Evidence has shown that a high diet diversity and the introduction in the first year of life of fruits, vegetables, yogurt and fish, through a fecal increase in the tolerogenic metabolite butyrate, is associated with protection against the development of allergies, even in later stages of life [33][34]. Figure 1 shows a summary of the protective and risk nutritional factors in CMA occurrence.
Nutrients 15 03328 g001 550
Figure 1. Cow’s milk allergy protective and risk nutritional factors. Legend: The figure depicts the nutritional protective and risk factors in CMA.

References

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Subjects: Allergy
Contributors MDPI registered users' name will be linked to their SciProfiles pages. To register with us, please refer to https://encyclopedia.pub/register :
Serena Coppola
,
Laura Carucci
,
Franca Oglio
,
Claudia Di Sarra
,
Gulsum Ozen
,
Roberto Berni Canani
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Update Date: 15 Aug 2023
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