Effect of Postprandial Hyperinsulinaemic Hypoglycaemia on Driving Performance.

Inclusion Criteria: * Aged ≥18 years * Roux-en-Y gastric bypass ≥1 year ago * PHH defined as postprandial plasma or sensor glucose\<3.0mmol/l according to the International Hypoglycaemia Study Group (1) and exclusion of other causes of hypoglycaemia * Possession of a valid Swiss driver's license. Passed driver's examination at least 3 years before study inclusion. Active driving in the last 6 months before the study. Exclusion Criteria: * Clinically relevant weight changes (≥5%) within the past 3 months * Incapacity to give informant consent * Historical or current diabetes based on HbA1c ≥6.5% without glucose-lowering treatment * Haemoglobin level below 11 g/dl * Ongoing treatment with glucose-lowering drugs, anorectic drugs, steroids or any medications known to affect gastric motility * Active heart, lung, liver, gastrointestinal, renal or neurological disease * Inability to follow study procedures * Pregnancy or breast-feeding