This May Be Why You Crave That Burger

iStock
iStock

You’re minding your own business when it hits you: the overwhelming desire for a juicy burger. Where did that sudden meat-need come from? Scientists at Johns Hopkins University may have an answer: a circuit inside your brain that seems to cause protein cravings. The researchers published their findings in the journal Science.

Animals like us need nutrients like protein in order to keep going. Many scientists believe that food cravings are our bodies’ way of motivating us to seek those nutrients out. Yet the exact neurological source of these craving impulses has been something of a mystery.

The authors of the current study started very, very small, looking at cells and circuits in the brains of fruit flies. Activities like mating can increase a fly’s protein cravings, so the researchers decided to focus on female flies that had recently had sex. The scientists monitored the flies' little brains while withholding the bugs’ favorite protein-rich meal of yeast. As the flies’ protein hunger increased, the researchers saw a small circuit of neurons they dubbed DA-WED light up.

To double-check that these cells were in fact craving-related, the scientists shut them down, then offered the recently mated females access to as much yeast as they wanted. But while the circuits were off, the yeast just didn’t seem all that appealing.

Shutting down the DA-WED cells didn’t make the flies drink any less water, nor did it make them eat less in general. They just didn’t feel like getting their yeast on.

These are early findings yet. More research will be needed to confirm the craving/brain cell link in flies, and we’ll definitely need more experiments before we can say the same is true in people. And the average burger also contains two other addictive substances: fat and refined carbohydrates (in the bun).

Still, this paper is an interesting start.

“Further characterization of these and related circuit mechanisms should help delineate the fundamental principles governing protein-specific hunger,” the authors say. “A better understanding of how animals choose to consume protein may also have implications for the treatment of obesity.”

Friday’s Best Amazon Deals Include Digital Projectors, Ugly Christmas Sweaters, and Speakers

Amazon
Amazon
As a recurring feature, our team combs the web and shares some amazing Amazon deals we’ve turned up. Here’s what caught our eye today, December 4. Mental Floss has affiliate relationships with certain retailers, including Amazon, and may receive a small percentage of any sale. But we only get commission on items you buy and don’t return, so we’re only happy if you’re happy. Good luck deal hunting!

3D Map Shows the Milky Way Galaxy in Unprecedented Detail

ESA
ESA

It's our galactic home, but the Milky Way contains many mysteries scientists are working to unravel. Now, as The Guardian reports, astronomers at the European Space Agency have built a 3D map that provides the most detailed look at our galaxy yet.

The data displayed in the graphic below has been seven years in the making. In 2013, the ESA launched its Gaia observatory from Kourou in French Guiana. Since then, two high-powered telescopes aboard the spacecraft have been sweeping the skies, recording the locations, movements, and changes in brightness of more than a billion stars in the Milky Way and beyond.

Using Gaia's findings, astronomers put together a 3D map that allows scientists to study the galaxy in greater depth than ever before. The data has made it possible to measure the acceleration of the solar system. By comparing the solar system's movement to that of more remote celestial objects, researchers have determined that the solar system is slowly falling toward the center of the galaxy at an acceleration of 7 millimeters per second per year, The Guardian reports. Additionally, the map reveals how matter is distributed throughout the Milky Way. With this information, scientists should be able to get an estimate of the galaxy's mass.

Gaia's observations may also hold clues to the Milky Way's past and future. The data holds remnants of the 10-billion-year-old disc that made up the edge of the star system. By comparing it to the shape of the Milky Way today, astronomers have determined that the disc will continue to expand as new stars are created.

The Gaia observatory was launched with the mission of gathering an updated star census. The previous census was conducted in 1957, and Gaia's new data reaches four times farther and accounts for 100 times more stars.

[h/t The Guardian]