Having low blood glucose means you are more likely to stick pins in a voodoo doll that represents your spouse, a new study suggests.
And you are more likely to blast your spouse with a loud unpleasant noise - given the chance, finds a study published this week in the Proceedings of the National Academy of Sciences.
The findings could point to a previously unrecognized contribution to aggression between married couples, says lead author Dr Brad Bushman, a professor of communication and psychology at Ohio State University in Columbus.
Preventing aggressive behavior relies on self control, which is governed by our pre-frontal cortex, says Bushman.
Self control requires energy, part of which comes from glucose.
"It's widely accepted that glucose boosts self control," said Bushman.
On the contrary, when our brain doesn't get enough glucose, we can get cranky -- something most of us can attest to from personal experience.
Voodoo doll experiment Bushman and colleagues previously showed that glucose was linked to control of anger in a short-term lab experiment involving interactions between strangers.