An illustration depicting 3D molecular models of glucose (left) and sucralose (right). Glucose is a simple sugar used to fuel cellular respiration, and is absorbed directly into the bloodstream during digestion. Sucralose is a noncaloric artificial sweetener used in products such as Splenda, which is not broken down by the body and can be up to 1,000 times as sweet as common table sugar. Atoms are colored dark gray (carbon), light gray (hydrogen), red (oxygen) and green (chlorine).