satiety : A physical feeling of fullness after eating.

saturated fat: Fats mostly from animal sources that are solid at room temperature. These fats are known to clog arteries.

scleroprotein: A protein resistant to digestive enzymes.

selenium: An important antioxidant and cancer-prevention mineral that varies in availability depending on its content in soils in different areas of the world.

serine: An amino acid that can be made in your tissues from glycine or threonine, so it is considered nonessential.

serotonin: A neurotransmitter that makes you feel relaxed.

set point theory: A theory that posits that the body is set to maintain a specific weight.

silicon : Important for tissue strength, silicon, usually referred to as silica, is the most commonly found element in the earth’s soil and in foods. It gives strength and firmness to the body tissues — the bones, cartilage, connective tissues, arteries, and skin.

sleep apnea: A condition in which your breathing is halted briefly while you sleep because your airways partially or totally collapsed.

sodium: Commonly known as salt, this mineral helps regulate your body’s fluid balance.

soluble fiber: This fiber, such as pectins in apples and beta-glucans in oats and barley, seems to lower the amount of cholesterol circulating in your blood (your cholesterol level). This tendency may be why a diet rich in fiber appears to offer some protection against heart disease.

stanols : Compounds created by adding hydrogen atoms to sterols from wood pulp and other plant sources.

sterols : Natural compounds found in oils in grains, fruits, and vegetables, including soybeans.

sucrose : Table sugar.

sulfur: Sulfur is an important part of several amino acids (the building blocks of protein), especially methionine and cysteine. This major mineral helps the body resist bacteria, cleanses the blood, and protects the protoplasm of cells.