Diabetes: The black drink that ‘significantly’ lowers blood sugar 60 minutes after intake

Different carbohydrates are digested and absorbed at different rates, and GI is a ranking of how quickly each carbohydrate-based food and drink makes blood glucose levels rise after eating them.

The higher the ranking, the more pronounced effect a given food will have on blood sugar levels.

High GI foods include:

• Sugar and sugary foods
• Sugary soft drinks
• White bread
• Potatoes
• White rice.

Low or medium GI foods, which are broken down more slowly and cause a gradual rise in blood sugar levels over time, include some fruit, vegetables and pulses.