Premenstrual food cravings are the punchline of endless jokes. Like most good jokes, they're funny because they're true.

Certain parts of a woman's menstrual cycle do seem to go hand in hand with the desire for chocolate ice cream and potato chips. I hear about this every day from my OBGYN patients.

Researchers have studied food cravings for years; one of the most cited studies dates back to 1953. Scientists – and lots of others – want to know who has food cravings and why, what they crave, when they crave it and how to minimize the cravings. Here's what the research has found.

Craving and eating before a period

Food cravings are just one of the many symptoms of premenstrual syndrome, also known as PMS. PMS is likely caused by hormonal fluctuations and how they affect chemical messengers in the brain called neurotransmitters. Its symptoms are exclusive to the second half of the menstrual cycle. This luteal phase of the cycle starts with the release of the egg at ovulation and ends when a period begins. The symptoms usually resolve around the third or fourth day of menstruation.

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Well Being

Fellow chocolate lovers, you're going to be soooooo giddy about this news.

As someone who keeps a bag of chocolate chips going at all times, I've often found myself bummed out by reports on the chocolate industry. Many chocolate producers use cocoa harvested by child labor, which is totally not OK. (It's why I try to buy fair-trade chocolate whenever possible.) Some national parks in West Africa have been demolished to make room for more cocoa farms — again, not OK.

But some recent news out of Brazil has us chocolate fans jumping for joy over our beloved cacao bean.

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Heroes

Thanks for stopping by for Day 23 of Upworthy's 31 Days of Happiness Countdown! If this is your first visit, here's the gist: Each day between Dec. 1 and Dec. 31, we're sharing stories we hope will bring joy, smiles, and laughter into our lives and yours. It's been a challenging year for a lot of us, so why not end it on a high note, with a bit of happiness? Check back tomorrow (or click the links at the bottom) for another installment!

GIF by FoxADHD/Tumblr.

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