#feeding behavior

document.write('<a style="display:none!important" id="2580009">'); if (window.AED_SHOW) window.AED_SHOW(wid: '2580009',shortkey:'E2J2jQN', size:'728x90', custom:); else window.AED_ONLOAD = window.AED_ONLOAD

Directly activating a heat sensor also sensitive to capsaicin in chili peppers in the hypothalamus had the same effect as exercise.

ISTOCK, ANYAIVANOVAThermometers in the mouse brain are responsible for a lack of appetite the animals feel after a vigorous workout. Simply firing up heat-sensing receptors on cells in the mouse hypothalamus can reproduce the same appetite-suppressing effects of exercise, researchers report today (April 24) in PLOS Biology.

“Our study provides evidence that body temperature can act as a biological signal that regulates feeding behavior, just like hormones and nutrients do,” says coauthor Young-Hwan Jo, a neuroscientist at Albert Einstein College of Medicine, in a press release.

It’s a fairly common observation among people that working out staves off hunger for a short while afterward. And it turns out the same is true in mice. Jo’s group had mice run a treadmill for 40 minutes, and observed that their brains were warmer and they ate less for the next hour. To see what might be responsible for this effect, Jo and his colleagues centered in on the hypothalamus, given its role in regulating eating.

They found that in mice, neurons in the hypothalamus—specifically, in the arcuate nucleus (ARC) of the hypothalamus—produce heat-sensitive receptors called TRPV1. Through a variety of methods, including the application of capsaicin, a compound found in hot chili peppers, the investigators revealed that flipping on TRPV1 could tamp down mice’s appetites. On the flip side, disrupting the receptor wiped out the appetite-suppressing effects of exercise.

“Hence, our results propose that elevated hypothalamic temperature can activate temperature-sensitive TRPV1-like receptors in [these] neurons, which may result in a reduction in food intake,” the researchers write in their report.

Norwegian Whales (Cont.): Amazing cooperative feeding in Norway.

To follow the stunning drone footage of killer whales off Norway, let’s turn to the National Geographic photo blog Proof, which in September published some incredible photos of Norwegian killer whales feeding on herring. Not only are the photos, by Paul Nicklen, beautiful. But they also show yet another highly intelligent, cooperative killer whale hunting behavior:

The orcas are working together,…

October 11, 2013—Humpback whales are known for their unique feeding behavior—called bubble—netting-at the water's surface. But researchers noticed the whales also spent a lot of time on the bottom. By mounting cameras on the animals, researchers saw for the first time that these whales were bottom-feeding.