There is evidence that micro-aspiration of stomach acid, or reflux of stomach acid over an inflamed lower oesophagus, can lead to bronchospasm in people with asthma. Asthma control may be better in these individuals if reflux is treated. In subjects with asthma and gastro-oesophageal reflux, not specifically recruited on the basis of reflux associated respiratory symptoms, there was no overall improvement in asthma following treatment for reflux oesophagitis. A subgroup was reported to gain benefit but it appears difficult to predict who will respond. Currently, Level 1 evidence is not available to support the general application of treatment of reflux oesophagitis to control asthma.
Foods can trigger acute asthma attacks.
No Level 1 evidence was identified on the effect of avoiding food allergens or additives on asthma. No Level 1 evidence was identified investigating the effects of avoiding these triggers on asthma.