Greg Neely wondered what was going on in his body when he drank diet soft drink.
The associate professor at the University of Sydney’s Charles Perkins Centre noticed that the drink seemed to make him feel hungry.
Previous studies have suggested that artificial sweeteners may increase appetite and cause cravings.
However, no one really understood why it happens.
So Neely, who has spent 15 years researching fruit flies, decided to find out.
In the comprehensive new study, published in the journal Cell Metabolism, Neely and his colleagues found that when fruit flies were consistently given a diet containing artificial sweetener, they consumed 30 per cent more kilojoules when their diet returned to naturally sweet food.