Artificial sweeteners are chemicals that offer the sweetness of sugar without as many calories. Artificial sweeteners are often used
as part of a weight-control plan. People with diabetes may use artificial sweeteners because they make food taste sweet without
raising blood sugar levels. Artificial sweeteners are the subject of debate; some think they cause health-related problems when
used in excess. One artificial sweetener, aspartame, is not safe for people who have the rare hereditary disease phenylketonuria (PKU).
Several positive attributes of artificial sweeteners are listed. If you were conducting experiments on the safety of artificial sweetener use,
what would be an appropriate hypothesis?