Does providing written dietary advice improve the ingestion of non-allergic nuts in children with existing nut allergies? - A randomized controlled trial

Barriers and Enablers of Dietary Reintroduction Following Negative Oral Food Challenge: A Scoping Review

BACKGROUND

After a negative oral food challenge (OFC), it is recommended for the individual to continue to consume the historical allergen regularly. However, the proportions of families achieving sustained reintroduction, and enablers and barriers for reintroduction, are currently unclear.

OBJECTIVE

To understand the frequency and definitions of optimal food reintroduction in children and adolescents after a negative OFC, and associated barriers and enablers.

METHOD

We conducted a scoping review guided by the Preferred Reporting Items for Systematic Reviews and Meta-Analyses extension for Scoping Reviews of four databases (PubMed, Embase, CINAHL, and Web of Science) from 2000 until the present. Medical Subject Headings guided our systematic search, and dual screening and extraction were performed. We applied descriptive analysis to examine key themes aligned with our research questions.

RESULTS

In total, 2,270 articles were screened and 22 studies were included across nine countries. Peanuts were the most studied food (17 studies; 749 OFCs), followed by cow's milk (12 studies; 625 OFCs), hazelnut (four studies; 361 OFCs) and hen's egg (11 studies; 340 OFCs). What was considered to be a successful reintroduction was poorly and inconsistently described. Successful reintroduction (as defined by the authors) ranged from 14% to 86%, with failed reintroduction up to 50%. Nineteen studies (86%) examined barriers or enablers of reintroduction. Primary barriers were fear and anxiety as well as symptoms with reintroduction and aversion to or refusal of the food, whereas younger age, male sex, and guidance from clinicians were commonly reported enablers.

CONCLUSION

The number of families who do not reintroduce foods after OFC remains high, and clinicians need high-quality data to support families better.

Interventions to Promote Food Allergy Literacy in Childhood: A Systematic Scoping Review

BACKGROUND

This article introduces the concept, food allergy literacy (FAL), which encompasses the knowledge, behaviors, and skills needed to manage a food allergy and is thus critical to child safety. Yet, there is limited clarity on how to promote FAL in children.

METHODS

Twelve academic databases were systematically searched to identify publications on interventions to promote FAL in children. Five publications met the inclusion criteria, which involved children (3 to 12 years), their parents, or educators and tested the efficacy of an intervention.

FINDINGS

Four interventions were for parents and educators, while 1 intervention was for parents with their children. The interventions were educational and focused on promoting participant knowledge and skills of food allergy, and/or psychosocial in nature, promoting coping, confidence, and self-efficacy in managing children's allergies. All interventions were deemed effective. Only 1 study used a control group, and none assessed the long-term benefits of the interventions.

IMPLICATIONS FOR SCHOOL POLICY, PRACTICE, AND EQUITY

The results can enable health service providers and educators to design evidence-based interventions to promote FAL. This might involve designing, implementing, and evaluating curricula and play-based activities, therein, that award greater attention to food allergy-its consequences, risks, skills to prevent risk, and managing food allergy in educational settings.

CONCLUSIONS

There is limited evidence on child-focused interventions that promote FAL. There is, therefore, considerable opportunity to co-design and test interventions with children.

Tree nut allergy: a systematic review

PURPOSE OF REVIEW

Systematic scoping review, focusing on randomized clinical trials of recent research addressing tree nut allergy.

RECENT FINDINGS

This review addresses published, unpublished, and re-analyzed studies on tree nut allergy definition, epidemiology, etiology, diagnosis, prognosis, and therapy.

SUMMARY

The importance of tree nut allergy spans nations, economies, and cultures. While broad themes in epidemiology, etiology, diagnosis, prognosis, and therapy are emerging, the next major advance in tree nut allergy will require large, robust studies to deliver results important to patients and families.

Effectiveness of educational interventions for quality of life of parents and children with food allergy: A systematic review

BACKGROUND

Educational intervention along with medical treatment is important to improve the quality of life of children with food allergies and their parents. This systematic review was designed to investigate the effects of education programs for parents and children with food allergies to provide a direction for developing an intervention program to improve their quality of life.

METHODS

A systematic review was conducted in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines. Relevant studies published between January 2010 and August 2021 were identified through a systematic search of 5 databases (PubMed, EMBASE, CINAHL, Cochrane Central Register of Controlled Trial, and Psycho Info).

RESULTS

A total of 2351 articles were identified. Of these, 9 met the inclusion criteria after duplicates were removed. Among these, only 2 studies, using the support and handbook provided, showed significant results on quality of life.

DISCUSSION

There is a lack of educational interventions for children with food allergies and their parents. Educational intervention, an essential intervention, can maximize medical treatment and improve overall quality of life. Hence, these interventions should be actively developed and applied in the future.

Factors influencing reintroduction of peanut and tree nuts after negative oral food challenges in children

BACKGROUND

Compliance with reintroduction of foods after a negative oral food challenge (OFC) is variable. Ongoing avoidance of tolerated foods is associated with recurrence of allergy and a reduced quality of life.

OBJECTIVE

To determine the proportion of children who reintroduced peanut or tree nuts after a negative OFC and to describe factors that influenced decisions regarding reintroduction or avoidance of nonallergic (negative) nuts.

METHODS

Families of children that had undergone an OFC for peanut or tree nuts at Sydney Children's Hospital were invited to participate. Consenting families were sent an online questionnaire.

RESULTS

The response rate to the questionnaire was 64%. More than 85% of respondents had introduced all or some of the negative nuts after the OFC and most had maintained at least some regular exposure in the child's diet at the time of the study. The age at diagnosis of the nut allergy and an awareness of the benefit of introducing foods after a negative OFC were significantly (P < .05) associated with introducing negative nuts. There was improved quality of life in those that introduced negative nuts.

CONCLUSION

Most families introduced or attempted to introduce negative nuts after a negative OFC. Educating families on the benefits of introducing foods after a negative OFC result is an important factor contributing to successful reintroduction.

Walnut oral immunotherapy for desensitisation of walnut and additional tree nut allergies (Nut CRACKER): a single-centre, prospective cohort study

BACKGROUND

The safety and efficacy of oral immunotherapy for tree nut allergy has not been demonstrated to date, and its effectiveness is complicated by the high prevalence of co-allergies to several nuts. This study aimed to investigate the use of walnut oral immunotherapy in the desensitisation of walnut and additional tree nuts in patients who are co-allergic to several nuts.

METHODS

In a single-centre, prospective cohort study (the Nut Co-Reactivity ACquiring Knowledge for Elimination Recommendations study) at the Institute of Allergy, Immunology, and Paediatric Pulmonology at the Yitzhak Shamir Medical Centre, we recruited patients aged 4 years or older who were allergic to walnut, with or without co-allergy to pecan, hazelnut, and cashew. The diagnosis of each food allergy was based on a positive skin prick test or specific serum IgE (≥0·35 kU_A/L) to the corresponding nut together with a positive oral food challenge, unless an immediate (within 2 h of exposure) reaction in the past year had been documented. Patients with uncontrolled asthma or a medical contraindication to receive adrenaline were excluded. Patients were assigned to walnut oral immunotherapy or the control group (observation and strict dietary exclusion) on the basis of the order of presentation to the clinic. Oral immunotherapy began with a 4-day dose-escalation phase to establish the single highest tolerated dose, which was consumed daily at home for 24 days; subsequent monthly dose escalations were repeated until 4000 mg walnut protein was achieved. Patients who were desensitised to walnut continued to consume 1200 mg walnut protein daily for 6 months as maintenance. The primary outcome was walnut desensitisation (passing an oral food challenge with 4000 mg of walnut protein) at the end of the study, analysed by intention to treat. In patients who were co-allergic to pecan, hazelnut, and cashew, the proportion who achieved cross-desensitisation to these nuts in addition to walnut desensitisation was examined.

FINDINGS

73 patients with a walnut allergy were enrolled between May 15, 2016, and Jan 14, 2018. 49 (89%) of 55 patients in the oral immunotherapy group were desensitised to walnut compared with none of 18 patients in the control group (odds ratio 9·2, 95% CI 4·3-19·5; p<0·0001). Following walnut desensitisation, all patients who were co-allergic to pecan (n=46) were also desensitised to pecan. Additionally, 18 (60%) of 30 patients who were co-allergic to hazelnut or cashew, and 14 (93%) of 15 patients who were co-allergic to hazelnut alone, were either fully desensitised or responded to treatment. 47 (85%) of 55 patients had an adverse reaction (mostly grade 1 or 2) during up-dosing in the clinic; eight patients required intramuscular epinephrine in response to a dose at home. Of 45 patients who had follow-up data for the maintenance phase, all maintained walnut desensitisation and one patient required epinephrine during this period.

INTERPRETATION

Walnut oral immunotherapy can induce desensitisation to walnut as well as cross-desensitisation to pecan and hazelnut in patients who have tree nut co-allergies, with a reasonable safety profile. A low daily dose of the allergen maintains desensitisation.

FUNDING

None.

Component-resolved diagnostics demonstrates that most peanut-allergic individuals could potentially introduce tree nuts to their diet

BACKGROUND

Nut allergy varies from pollen cross-allergy, to primary severe allergy with life-threatening symptoms. The screening of IgE antibodies to a wide spectrum of allergens, including species-specific and cross-reactive allergens, is made possible via microarray analysis.

OBJECTIVE

We sought to study the association of variable IgE sensitization profiles to clinical response in peanut-challenged children and adolescents in a birch-endemic region. In addition, we studied the avoidance of tree nuts and species-specific sensitizations.

METHODS

We studied 102 peanut-sensitized patients who underwent a double-blind placebo-controlled challenge to peanut. We analysed ISAC ImmunoCAP microarray to 112 allergens, singleplex ImmunoCAPs for hazelnut Cor a 14 and cashew Ana o 3, and performed skin prick tests to peanut, tree nuts and sesame seed. We surveyed avoidance diets with a questionnaire.

RESULTS

Sensitization to PR-10 proteins was frequent (Bet v 1 90%), but equally high in the challenge negatives and positives. IgE to Ara h 2 and Ara h 6 discriminated peanut allergic (n = 69) and tolerant (n = 33) the best. Avoidance of tree nuts was common (52% to 96%), but only 6% to 44% presented species-specific sensitizations to tree nuts, so a great number could potentially introduce these species into their diet.

CONCLUSIONS AND CLINICAL RELEVANCE

PR-10-sensitizations were frequent and strong regardless of peanut allergy status. Component-resolved diagnostics can be employed to demonstrate to patients that sensitization to seed storage proteins of tree nuts is uncommon. Several tree nuts could potentially be reintroduced to the diet.

Developments in the field of allergy in 2016 through the eyes of Clinical and Experimental Allergy

In this article, we described the development in the field of allergy as described by Clinical and Experimental Allergy in 2016. Experimental models of allergic disease, basic mechanisms, clinical mechanisms, allergens, asthma and rhinitis, and clinical allergy are all covered.