Introverts are less likely to overeat
Which means they're less likely to be overweight, which in turn means they're healthier, obviously. When researchers looked at how much cereal extroverted and introverted students served themselves, the extroverts piled on 33% more cereal than introverts. Easy on the Cookie Crisp, extroverts.
One potential explanation for this is that extroverts and introverts processed the bowl size differently. Researchers speculated that introverts must have relied more on internal cues like hunger and appetite, instead of a bowl telling them how much to pour. That's a pretty cool trick, listening to your body instead of an inanimate object.
Introverts make fewer mistakes
One of the reasons extroverts seem like they run the world is that they put themselves out there more, which is fine, if you don't mind making a bunch of mistakes. You only need to look at all of Donald Trump's failed businesses to see that mistakes don't matter much for a person who thrives on external stimuli.
But there are broader implications, too. Genetic variations linked to introversion also seem to make people more averse to financial risk. So if you're looking for someone to manage your portfolio, you're better off avoiding the brash Wall Street stereotype.