Impact of Breastfeeding Promotion on Allergy-Related Conditions
Introduction to the Study
Researchers have explored the effects of a breastfeeding promotion intervention on allergy-related conditions, such as atopic eczema and asthma, in adolescents. Breastfeeding offers numerous emotional and health benefits for both mothers and their children. Among its many advantages, breastfeeding is thought to play a role in preventing allergies and related conditions, including asthma and atopic eczema. Consequently, mothers are encouraged to breastfeed exclusively for a duration of four to six months.
Inconsistencies in Existing Guidelines
The recommendations surrounding breastfeeding are largely based on observational studies, which have produced inconsistent results. A recent study published in JAMA Pediatrics aimed to provide clearer evidence regarding the long-term effects of prolonged and exclusive breastfeeding on the risk of developing atopic eczema, asthma, and low lung function.
Methodology of the Study
This study diverged from previous research by utilizing data from the Promotion of Breastfeeding Intervention Trial (PROBIT). The research involved 17,046 mother-child pairs from 30 hospitals and clinics in Belarus, who were randomly assigned to either an intervention group that participated in a breastfeeding promotion program or a control group adhering to standard breastfeeding recommendations.
The children were monitored over a span of 16 years, with regular assessments during the first 12 months of life to evaluate atopic eczema. At the age of 6.5 years, parents completed a questionnaire to report symptoms of asthma and atopic eczema, while the children underwent skin-prick tests for allergies. At 16 years, the children repeated the questionnaire, had their skin assessed, and underwent lung function measurements.
Key Findings of the Study
The authors conducted various analyses using a breastfeeding exclusivity and duration cut-off of three months, which was shorter than anticipated due to 55.3% of mothers in the promotion group not breastfeeding exclusively during the first three months. In contrast, 93.1% of mothers in the control group did breastfeed exclusively. Despite this finding, a higher proportion of mothers in the breastfeeding promotion group managed to exclusively breastfeed their children for six months or more compared to the control group.
All results were adjusted for factors such as sex, geographical location (urban vs. rural, East vs. West Belarus), parental education level, birth weight, and both parental and child smoking status. Notably, 13,557 children (79.5%) were successfully followed over 16 years, with similar male-to-female ratios and sociodemographic characteristics across both groups.
Analysis of Health Outcomes
Findings indicated that both males and females in the breastfeeding promotion group experienced a 54% lower risk of developing flexural eczema, which occurs in the skin creases of the elbows, knees, or wrists, by age 16. However, the intervention did not appear to influence self-reported symptoms of asthma or atopic eczema, nor did it impact lung function in adolescents.
Strengths and Limitations
The study’s strengths include a high follow-up rate, a large cohort, a randomized design, and the incorporation of physician assessments alongside self-reported questionnaires. However, the authors raised concerns about the potential limitations in generalizing these results to other populations. Although healthcare and sanitation conditions in Belarus are comparable to those in the USA and Western Europe, atopic eczema is less prevalent in Belarus. The authors speculated that this discrepancy may be attributed to increased exposure to various environmental risk factors in wealthier nations.
Conclusion
In summary, the outcomes of this long-term, randomized controlled trial suggest that prolonged and exclusive breastfeeding may reduce the risk of flexural eczema during adolescence.
Reference
Flohr C, Henderson AJ, Kramer MS, et al. Effect of an intervention to promote breastfeeding on asthma, lung function, and atopic eczema at age 16 years. Follow-up of the PROBIT randomized trial. JAMA Pediatr. [published online ahead of print November 13, 2017]. Available at: doi:10.1001/jamapediatrics.2017.4064.
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