But there was no explanation as to why men fared no better after their caffeine fix.

BBC: Coffee knocks out women's pain

But will it be enough to get more Chinese customers to line up for a daily caffeine fix?

FORBES: To Caffeinate China, Starbucks Takes A Page From Burberry's Playbook

Next time you're craving that caffeine fix, think about subbing in the needs of another person for your mocha cookie-crumble frappuccino.

CNN: How to buy happiness