Continuous, non-invasive monitoring of gastroin testinal (GI) activity offers potential for improving the assessment of functional digestive disorders and confounding factors such as food intolerances. Here, we present preliminary results from the Lactobreath pilot study, investigating associations between bowel sound features recorded with the DigeHealth continuous GI monitoring system and participant characteristics and breath markers following lactose ingestion. We analyzed per-minute single-burst counts (sb mean) across participant subgroups and examined temporal bowel sound dynamics throughout the day. Associations between sb mean and breath hydrogen (H2) concen trations were evaluated by correlation analysis. Notably, among participants exhibiting substantial intraday variability in gas emissions, sb mean variability was moderately correlated with H2 concentration variability (r = 0.52, p = 1.13 × 10−9), with positive correlations observed in 36 out of 41 participants. Finally, we assessed the feasibility of classifying lactase (non )persistent participants using longitudinal bowel sound features and compared performance to H2-based features with a Random Forest classifier. Results indicate that bowel sound dynamics exhibit differing distributional and temporal patterns across participant groups and achieve a subject-level classification ROC AUC of 0.72 (compared to 0.97 for H2-based classification) showing the potential of continuous bowel sound monitoring as a non-invasive complement to standard diagnostic methods.