Blood sugar is literally the amount of "[[sugar]]" (more accurately _glucose_) in your bloodstream. Glucose in your blood is a vital part of how your circulatory system functions. Blood carries oxygen _and_ energy to the cells around your body. [[Insulin]] causes glucose from your bloodstream to enter other cells throughout your body to give them energy Blood sugar rises after eating. Different foods cause it to rise different amounts. Moreover, different foods cause different blood sugar responses in different _people_. Foods that cause blood sugar to rise rapidly (creating a "blood sugar spike") are said to be high on the [[Glycemic Index]]. **** # More ## Source ## Related