One sweetner which seems to be causing concern is Aspartame - also called NutraSweet and Canderel. A leaked letter from the Food Standards Agency, which referred to recent studies, said that 'there is clearly sufficient new data to justify a review.'
The problem with Aspartame is that it's thought to break down into formaldehyde, which is dangerous when digested. Side effects include headaches, skin and stomach disorders, impaired vision, depression, carbohydrate cravings, panic attacks, an irregular heartbeat and seizures. One scientist claimed it was linked to cancer.
But according to the manufacturers of Aspartame, all its constituents can be found at higher levels in tomato juice and milk, and that it has shown to be safe.