SummaryGastrointestinal permeability has been studied in a group of clinically proven food‐allergic eczematous children and compared with a control group using lactulose and L‐rhamnose as probe markers. No significant difference was demonstrated in baseline permeability measurements between eczematous and control children using isotonic or hypertonic oral loading. Similarly after antigen‐challenge permeability results showed no significant difference from the controls although two of the ten eczematous children challenged showed increased permeability to lactulose. These findings support the hypothesis that once sensitized the physiological absorption of dietary antigen may be sufficient to maintain an allergic response in the
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