A University of Guelph (Ontario) study shows that drinking a cup or two of caffeinated coffee an hour before a carbohydrate-dominated cereal breakfast significantly drives up the body's blood sugar or glucose response, no matter if the cereal is low sugar or relatively sugary.What's more, the study found that regular coffee taken an hour before the low-sugar cereal (All-Bran in this study) increases blood-sugar readings about 250 percent greater than if you consumed a cup of decaf an hour before a bowl of moderately sugared cereal (Crispix).
"What we found is both the resistance to insulin and glucose levels went up dramatically with either cereal if (volunteers) had caffeinated coffee before the meal," said researcher Terry Graham. "It's the caffeine in the coffee that is altering your body's sugar response. It makes us resistant to insulin, which in turn makes our blood sugar levels go higher."
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