Hydrogen excretion upon ingestion of dairy products in lactose-intolerant male subjects: importance of the live flora.

OBJECTIVE

To assess the effects of the ingestion of milk, yoghurt (10(8) bacteria/ml), heat-treated yoghurt (<15 bacteria/ml) and two products obtained by dilution of yoghurt with heat-treated product (10(6) and 10(5) bacteria/ml) on hydrogen production and symptoms of lactose intolerance in lactose malabsorbers.

DESIGN

Double-blind, randomised cross-over design.

SETTING

The study was performed in the phase 1 clinical unit of OPTIMED, Nancy, France.

SUBJECTS

Twenty-four male lactose malabsorbers were selected for the study.

INTERVENTIONS

Hydrogen production and adverse events were followed during 8 h after ingestion of the products.

RESULTS

The results clearly demonstrate that ingestion of yoghurt with 10(8) bacteria/ml leads to lower H(2) excretion and complaints than the other products. Results observed with the products containing a reduced population of live flora remain better than those observed with milk.

CONCLUSIONS

The importance of a high population of the live flora is underlined.