I wonder if the 'Froot Loops' used in the study contained American-style levels of refined sugar. Maybe the rats just learned that driving the car gets them that sweet, sweet hit of the crack cocaine version of the delicious and nutritious sugar cane.<p>Plus, even a single human Froot Loop would be quite large for a rat. Maybe I'm wrong, but that seems like that's a ton of sugar, yet the article makes no mention of the refined sugar content, after even mentioning their having used cocaine before in their studies.<p>It looks to me like those researchers have zero clue about the effects of refined sugar on human beings, much less lesser mammals such as rats. Perhaps I'm wrong, but this looks like worthless drivel, but with good funding to invest in "cool" toys for disposable animals.<p>As to happiness, most people confuse pleasure with happiness, but that's a different discussion altogether.