Not So Sweet

It may be that artificial sweetners are not helpful:

• People who get used to the very sweet taste of these products find that the normal flavor of fruits and vegetables just isn't as appealing.
• They may also feel hungrier after having foods and drinks containing artificial sweeteners. As a result, people may take in more calories afterward.
• And artificial sweeteners may encourage the body to develop new fat cells

See this MedlinePlus article for details of the study.