Aspartame is the artificial sweetener commonly found in products such as diet soft drink, lite yoghurt and sugar free gum to name just a few.
But recent reports linking it to a range of diseases including cancer and brain lesions have seen sales of aspartame-containing products plummet as New Zealanders returned to consuming their high-sugar alternatives.
Is there any foundation to the claims? Dr Bernadene Magnuson is a toxicologist who is in New Zealand, sponsored to present a series of seminars by Cocacola. Both she and Abby Cormack, who believes she is a victim of aspartame poisoning, spoke to Sunrise.