O açúcar, uma droga dura

The animals also showed withdrawal symptoms, including anxiety, shakes and tremors, when the effect of the sugar was blocked with a drug. The scientists, moreover, were able to determine changes in the levels of dopamine in the brain, similar to those seen in animals on addictive drugs.

A 2007 French experiment stunned researchers when it showed that rats prefer water sweetened with saccharine or sugar to hits of cocaine -- exactly the opposite of what existing dogma would have suggested.

Aqui.