A study which showed that rats fed on artificial sweetener still put on weight has baffled researchers.
Scientists from Purdue University in the US now believe that a sweet taste followed by no calories may make the body crave extra food.
Their research, published in the journal Behavioral Neuroscience, found that rats fed sugar subsequently had lower appetites.
But nutritionists say that low-calorie sweeteners are still best for health.
Source: BBC News