Now, researchers have found that eating chocolate, the number one food craved by American women, causes the brain to release endorphins, chemicals that make us feel good.

CNN: Researchers say chocolate triggers feel-good chemicals

The researchers then offered the rats chocolate milk in their cages, but mixed it with lithium chloride, which causes light nausea.

FORBES: Could We One Day Switch Off Bad Habits in Our Brains?

Of course, the fact that science has not, to date, shown conclusively that chocolate - pure or impure, in bar-form or egg-shaped - causes acne is unlikely to stop adults using the threat of spots to try and slow down their children's intake.

BBC: Does chocolate give you spots?