Neuroscientists at the University of Michigan say they have a better understanding of the so-called "sweet tooth."
Researchers have discovered a "pleasure spot" in the brains of rats. They say the brain triggers a larger appetite cube that makes rats like sweets more, causing them to eat more than normal.
Scientists say sweetness by itself is merely a sensation, and its pleasure arises when the brain's neural systems generate an elevated reaction.
The researchers wanted to learn whether the need for pleasure is linked to the growing number of obese Americans.
Their study is in the latest issue of the Journal of Neuroscience.