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Glycaemic index is a poor predictor of how foods raise blood sugar

A study of people with prediabetes shows that the same foods affect blood sugar levels very differently. The findings add to a growing body of evidence undermining the idea of a standard glycaemic index



Health



25 June 2022

BF59PT food label showing low glycaemic index tested on a packet of cous cous in the uk. Image shot 2016. Exact date unknown.

Many food labels include information on glycaemic index score

Radharc Images/Alamy

People with prediabetes who eat the exact same foods can have very different blood sugar levels.

These findings, which were presented at the online American Society for Nutrition conference last week, are the latest to suggest that the glycaemic index (GI) is an unreliable predictor of how foods affect blood sugar levels.

The idea behind GI is simple: foods are scored based on how quickly they increase glucose levels in the blood. Those above 70 are high GI foods, meaning they …

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