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Published on: August 7, 2017
Breast-feeding and atopic disease: a cohort study from childhood to middle age
Melanie Claire Matheson1, Bircan Erbas, Aindralal Balasuriya
1Center for Molecular, Environmental, Genetic & Analytic Epidemiology, School of Population Health, University of Melbourne, Melbourne, Australia. mcmat@unimelb.edu.au
Insights
Exclusive breastfeeding may protect against early childhood asthma but increases the risk of allergic asthma and atopy later in life. This finding challenges long-term recommendations for high-risk infants.
Area of Science:
- Pediatrics
- Immunology
- Epidemiology
Background:
- The relationship between breastfeeding and atopic diseases is debated, with existing literature showing contradictory findings.
- Understanding long-term effects of breastfeeding on atopy is crucial for public health recommendations.
Purpose of the Study:
- To investigate the association between exclusive breastfeeding and the development of atopic disorders.
- To assess these associations in a cohort followed from childhood into middle age.
Main Methods:
- A population-based prospective cohort study (Tasmanian Asthma Study) followed participants from age 7 to 44 years.
- Exclusive breastfeeding in the first 3 months of life was analyzed as a risk factor for atopic diseases.
- Statistical analyses included multiple logistic regression and generalized estimating equations.
Main Results:
- At age 7, exclusive breastfeeding was associated with a marginally lower risk of asthma in children with a maternal history of atopy.
- After age 7, exclusive breastfeeding was linked to an increased risk of asthma at ages 14, 32, and 44.
- Exclusive breastfeeding reduced the risk of food allergy at age 7 but increased the risk of food allergy and allergic rhinitis at age 44.
Conclusions:
- Exclusive breastfeeding offers protection against asthma before age 7 in infants with a maternal history of atopy.
- The long-term benefits of exclusive breastfeeding for preventing allergic asthma and atopy require re-evaluation.
- Current recommendations for breastfeeding high-risk infants for early wheezing illness are supported, but long-term protection against atopy needs reconsideration.
Background:
The literature regarding the association between breast-feeding and atopic diseases has been contradictory.
Objective:
We have assessed the relationship between breast-feeding and atopic disorders in a cohort followed into middle age.
Methods:
The Tasmanian Asthma Study is a population-based prospective cohort study that has followed participants from the age of 7 to 44 years. Exclusive breast-feeding in the first 3 months of life was examined as a risk factor for atopic diseases by using multiple logistic regression and generalized estimating equation analyses.
Results:
At age 7 years, exclusively breast-fed children with a maternal history of atopy had a marginally lesser risk of current asthma than those not exclusively breast-fed (odds ratio [OR], 0.8; 95% CI, 0.6-1.0). However, after age 7 years, the risk reversed, and exclusively breast-fed children had an increased risk of current asthma at 14 (OR, 1.46; 95% CI, 1.02-2.07), 32 (OR, 1.84; 95% CI, 1.06-3.3), and 44 (OR, 1.57; 95% CI, 1.15-2.14) years. Exclusively breast-fed children also had a reduced risk of food allergy at age 7 years but an increased risk of food allergy (OR, 1.26; 95% CI, 1.1-1.5) and allergic rhinitis (OR, 1.2; 95% CI, 1.0-1.3) at 44 years.
Conclusion:
Exclusively breast-fed babies with a maternal history of atopy were less likely to develop asthma before the age of 7 years, but more likely to develop asthma after the age of 7 years.
Clinical Implications:
The current recommendation to breast-feed high-risk infants for protection against early wheezing illness can be confirmed. However, the recommendation should be reconsidered for protection against allergic asthma and atopy in the longer term.
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