Elasticity is the ability of a tissue or other material to return to its original size or shape after stretching or elongation.
Empty Calories
Foods high in sugar and fat without significant nutritional value (vitamins and minerals) contain empty calories.
Endorphins
Any of a group of proteins with potent analgesic properties that occur naturally in the brain. These are the brain chemicals that contribute to the runner's high or good feelings during and after exercise.
Energy
Measured in calories from carbohydrates, protein and fat, energy is the potential to do work and activity.
Enzyme
Proteins in small amounts that speed up chemical reactions.
Epinephrine
A sympathomimetic hormone produced by the adrenal glands, that increases the heart rate, dilates breathing passages, constricts blood vessels, raises blood pressure, and accelerates the peristaltic motion of the muscles lining the intestines. Also known as adrenaline.
