65,000 copies of Tesco's GI Guide have been sold since it was introduced in January, but Sainsbury’s denies it is cashing in on the success of its biggest rival.

Amy Cashmore, a spokesperson for Sainsbury’s, said: “"The scientific evidence is increasingly pointing towards the importance of low GI foods as part of a healthy diet.

Sainsbury's healthy eating range

We have been working closely with one of the UK's leading GI experts Dr Gary Frost, Head of the Nutrition and Dietetic Research Group at Imperial College, London, to identify which products should be tested and labelled.”

GI friendly food sales up

The supermarket said sales of low GI foods had increased since December when public awareness of the GI Diet began to grow. Green tea sales have risen by over 30% in the last three months.

Earlier this week the supermarket Waitrose also confirmed a sharp increase in demand for GI friendly foods seeing a 264% rise in the sale of blackberries.

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