| − | A chemical substance essential for the normal working of the human body.<ref>Wile, Dr. Jay L. ''Exploring Creation With General Science''. Anderson: Apologia Educational Ministries, Inc. | + | A chemical substance found in food essential for the normal working of the human body, beyond providing dietary calories.<ref>Wile, Dr. Jay L. ''Exploring Creation With General Science''. Anderson: Apologia Educational Ministries, Inc. |