Cheating never works!
Granted, the study referred to below, involved the brain of a fruit fly, however researchers think that human brains have similar mechanisms to help differentiate between real and ‘fake’ sugar.
It appears that real sugar stimulates nerve cells to trigger off a hormonal reaction initiating the digestive process. This does not seem to happen when artificial sweeteners are consumed (by the aforementioned fruit flies).
This study may go some way to explaining why we need to keep on snacking and snacking and snacking when consuming diet food or drinks. Cheating never works…