A person' s intake of refined sugar and of foods that break down into sugars during digestion is the dietary source of virtually all of the glucose (a type of sugar) that reaches that person' s bloodstream
Coffee, however, which itself does not break down into sugars during digestion, sometimes causes a person' s blood-glucose level to rise dramatically, even if the coffee is consumed without cream or any sweeteners
Drinking more than two cups of coffee in an hour increases a person's level of stress, and the body reacts to stress by releasing stored glucose into the blood.