Your blood sugar level reacts to your food. When you eat carbohydrates, they are metabolized more or less quickly depending on the type and then enter your blood as sugar. There are carbohydrates that are broken down slowly, causing your blood sugar level to rise and fall more slowly. Other carbohydrates enter the blood very quickly because they do not require extensive digestion. They then ensure that your blood sugar level rises very quickly, and then also falls again quickly. These are the so-called short-chain carbohydrates. These include various types of sugar.