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
For many people, the consumption of one piece of chocolate cake has the same stimulating effect as one cup of plain coffee.