scent

From cinnamon buns in the morning to a burger after a long run, food never smells as good as when you're superhungry.

Now scientists have uncovered a clue as to why that might be — and it lies in the munchies and marijuana.

Receptors in the brains of mice that light up when the animals are high are also activated when the critters are fasting, French scientists reported Sunday in the journal Nature Neuroscience.