Mother’s high-fibre diet may protect her offspring from asthma
A studied mechanism by which a high-fibre diet during pregnancy in mice can increase the chances of offspring growing up asthma-free has been reported in the publication “Nature Communications” this week. The study shows a relationship between fibre metabolites from the female mouse’s diet and the epigenetic suppression of certain allergic immune responses in her offspring.
Researchers have previously suggested that the high prevalence of asthma in recent years may be correlated with increased consumption of a Western-style diet which lacks fibre. In addition, a high fibre intake had been shown to prevent allergic responses in experiments using mice. However, before this latest research, it was unclear how long the benefits of such a diet could last and when dietary fibre intake is most beneficial.
Charles Mackay and colleagues fed pregnant mice diets with different levels of fibre, then exposed their adult offspring to asthma-inducing allergens. The mice exposed to a high-fibre diet in the womb were resistant to asthma development as adults. The authors find that this is because the digestion of fibre by certain gut bacteria produces metabolites that are taken up into the bloodstream and that these suppress inflammatory and allergic reactions. These metabolites also have epigenetic effects on the mouse foetus, suppressing certain genes linked to both human asthma and allergic airways disease (a mouse model for human asthma).
The authors also found that a high fibre diet in pregnant women results in the presence of the same metabolites, and that these are associated with a significant decrease in infants requiring more than 2 visits to the doctor for respiratory complaints in their first year of life.