Well, actually, it seems as though what happens is that if you drink green tea while eating starches, like bread, rice, or potatoes, it helps prevent the sudden spike in blood sugar that normally happens. This is from a study on mice, conducted by researchers at Penn State in 2012. When mice who were eating starchy food were also fed some of the anti-oxidant that is found in green tea, epigallocatechin-3-gallate (or EGCG), their blood sugar increased less than other mice (who were also eating starchy food). The Science Daily article does not relate how much EGCG was fed to the mice, or how that would proportionately compare to the amount you get from drinking a cup of tea. Still; it is a lovely idea. Hopefully someone will research this further.