Natural Fruit Extract Versus the Assumed Key Active Compound in Reducing the Post-prandial Blood Glucose Level

Inclusion Criteria: * Body mass index (BMI) ≥ 18.5 and ≤ 25.0 kg/m2. * Apparently healthy males and females: no medical conditions which might affect the study measurements, absorption, metabolism and distribution (including diabetes type 1 and type 2, gastrointestinal dysfunction, gastrointestinal surgery \[with exception of cholecystectomy and appendectomy\] and inflammatory diseases). * Fasting blood glucose value of subjects is ≥ 3.4 and \<6.1 mmol/litre (i.e. 62- 110 mg/dl) at screening. Exclusion Criteria: * Use of antibiotics within 3 months before day 1; use of any other medication within 14 days before day 1 except for both paracetamol and hormonal contraception.