Exposure To Bacteria By Infants Helps Prevent Allergies Later In Life, Danish Research Suggests
If infants encounter a wide range of bacteria they are less at risk of developing allergic disease later in life. This is the conclusion of research from the University of Copenhagen, which suggests completely new factors in many modern lifestyle diseases.
Oversensitivity diseases, or allergies, now affect 25 per cent of the population of Denmark. The figure has been on the increase in recent decades and now researchers at the Dansk BørneAstma Center [COPSAC, Copenhagen Prospective Studies on Asthma in Childhood], University of Copenhagen, are at last able to partly explain the reasons.
A variety of bacteria offers protection...
"In our study of over 400 children we observed a direct link between the number of different bacteria in their rectums and the risk of development
of allergic disease later in life," say researchers at Gentofte Hospital and experts of children's diseases at the Faculty of Health Sciences, University of Copenhagen.
of allergic disease later in life," say researchers at Gentofte Hospital and experts of children's diseases at the Faculty of Health Sciences, University of Copenhagen.
"Reduced diversity of the intestinal microbiota during infancy was associated with increased risk of allergic disease at school age"
If there was considerable diversity, the risk was reduced, and the greater the variation, the lower the risk.
"So it makes a difference if the baby is born vaginally, encountering the first bacteria from its mother's rectum, or by caesarean section, which exposes the new-born baby to a completely different, reduced variety of bacteria. This may be why far more children born by caesarean section develop allergies."
No allergy-causing bacteria...
In the womb and during the first six months of life, the mother's immune defences protect the infant. Bacteria flora in infants are therefore probably affected by any antibiotics the mother has taken and substances she has been exposed to.
The researchers also emphasise "there is not one single allergy bacteria,"
"We have studied staphylococci and coli bacteria thoroughly, and there
is no relation. What matters is to encounter a large number of different bacteria early in life when the immune system is developing and 'learning'. The time during which the infant is immunologically immature and can be influenced by bacteria is brief, and closes a few months after birth.
is no relation. What matters is to encounter a large number of different bacteria early in life when the immune system is developing and 'learning'. The time during which the infant is immunologically immature and can be influenced by bacteria is brief, and closes a few months after birth.
"Our new findings match the large number of discoveries we have also made in the fields of asthma and hay fever," the researchers explain.
Like allergies, they are triggered by various factors early in life.
Like allergies, they are triggered by various factors early in life.
The researchers gathered their data from a target group consisting of
411 children whose mothers have asthma. This cohort was monitored, interviewed and tested continually from when the children were born 12 years ago, and the COPSAC group has published articles at regular intervals with new knowledge about allergy and asthma ever since.
411 children whose mothers have asthma. This cohort was monitored, interviewed and tested continually from when the children were born 12 years ago, and the COPSAC group has published articles at regular intervals with new knowledge about allergy and asthma ever since.
Findings could be relevant for other modern diseases...
The team of research scientists acknowledge the irony of something that used to be perceived as a threat to public health (specifically "bacteria") now turning out to be a fundamental part of a healthy life. He also points
out that there may be other links, such as between intestinal flora and diabetes or obesity and other lifestyle diseases affecting Western civilization.
out that there may be other links, such as between intestinal flora and diabetes or obesity and other lifestyle diseases affecting Western civilization.
"I think that a mechanism that affects the immune system will affect more than just allergies, they conclude. It would surprise me if diseases such as obesity and diabetes are not also laid down very early in life and depend on how our immune defences are primed by encountering the bacterial cultures surrounding us."
Story Source: University of Copenhagen.
Dirt prevents allergy, Danish research suggests.
Dirt prevents allergy, Danish research suggests.
Journal Reference: Reduced diversity of the intestinal microbiota during infancy is associated with increased risk of allergic disease at school age. Journal of Allergy and Clinical Immunology, 2011;
This article is for informational and educational purposes only, and is not intended to provide medical advice, diagnosis or treatment. Contact your doctor or healthcare professional for medical and nutritional consultation.




















