Our GI tests involve a minimum of 10 healthy human participants, who are required to fast at least 12 hours before their test session. Prior to GI testing of a food, three glucose references are measured on three different occasions (50g or 25g of available carbohydrate portions, depending on the test food).
On the day of testing
- Two fasted capillary blood samples are taken by trained personnel
- The test food / glucose drink is consumed within 15 minutes
- Capillary blood samples are taken every 15-30-minute intervals after consumption for two to three hours.
From this, the area of the curve (AUC) is calculated that reflects the total rise in blood glucose levels after eating the test food or glucose drink. The final GI value of a food is the average of all participants.