The low-calorie sweetener, aspartame, is unsafe.
Aspartame is a commonly used low-calorie sweetener that has been extensively tested and declared safe by governmental and independent organizations all over the world. Both the U.S. Food and Drug Administration (FDA) and the European Food Safety Authority (EFSA) have found it to be safe for use in foods and beverages.
In fact, EFSA reaffirmed that aspartame is safe for consumption by the general population as recently as December 2013. This opinion is based on the most comprehensive risk assessments of aspartame to-date.
According to decades of scientific research, aspartame can be an effective tool in both weight loss and weight management. It is also recommended as a sugar substitute by the American Diabetes Association.