Researcher Terry Graham of the University of Guelph in Canada has
said that people who drink a cup of coffee before breakfast face the risk of
elevating their blood sugar levels.
Along with graduate students Lesley Moisey and Stia
Kacker, he conducted a small study where healthy male volunteers were asked to
consume caffeinated and decaffeinated coffee one hour before eating breakfast.
At breakfast two types of cereal were used - one with
low-levels of sugar and one with moderate levels - to test the blood sugar
levels after the meal was consumed. People who drank caffeinated coffer and had
a low-sugar cereal had a 250 percent
jump in their blood sugar levels as compared to when they drank decaffeinated
"Caffeine interferes with our body's response to
insulin," Graham said. "It makes us resistant to insulin which in
turn makes our blood-sugar levels go higher."
The study is
published in the American Journal of Clinical Nutrition.