Glucose is carried through the bloodstream to provide energy to all of the body's living cells. The cells cannot use glucose without the help of insulin. The force of the blood against the artery walls. Blood sugar See Blood Glucose. Top of page C Calluses Thick, hardened areas of the skin, generally on the foot, caused by friction or pressure.
Calluses can lead to other problems, including serious infection and even gangrene.
Carbohydrates One of three major sources of calories in the diet. Carbohydrate is broken down into glucose during digestion and is the main nutrient that raises blood glucose levels. Cholesterol A substance similar to fat that is found in the blood, muscles, liver, brain, and other body tissues. The body produces and needs some cholesterol. However, too much cholesterol can make fats stick to the walls of the arteries and cause a disease that decreases or stops circulation.