UK supermarket company Tesco is to label its own-brand foods with a 'glycemic index', which ranks carbohydrates according to their effect on blood glucose levels.

The information will be useful to those following a low-carb diet, as well as athletes who need to restore blood-sugar levels after exercise and diabetics, reported Marketing.

Tesco is reportedly in talks with Olympic rower Sir Steve Redgrave about appearing in an advertising campaign to back the new labels. Redgrave is vice-president of the Diabetes UK charity.