在线英语听力室_免费在线英语听力学习网站

This is Scientific American’s 60-Second Science. I’m Adam Hinterthuer. Got a minute？

Here’s a possible blood pressure remedy. But it’s only for those who can stand the heat. It’s capsaicin, the “active ingredient” in peppers like habaneros that should probably be sold by prescription¹ only. While lips burn and eyes water, blood vessels² actually relax, thanks to increased production of the signaling molecule³ nitric oxide⁴. In rodents⁵, anyway.

For seven months, researchers in China fed a steady diet of capsaicin to rats bred to be hypertensive. Long-term consumption of the chemical substantially lowered the rats’ blood pressure. The results appear in the August issue of the journal Cell Metabolism⁶.

Previous research found mixed results with capsaicin, but those studies only looked at short-term effects. Human trials are now needed, but there’s already a clue. Some 20 percent of people in northeastern China have high blood pressure. But the southwest—where hot peppers are a dietary staple—has a much lower incidence, half in some places.

Human studies could also confirm whether the habanero, as legend has it, can cause hearing loss. Allegedly so that diners don’t have to listen to their own screams.

Thanks for the minute. For Scientific American’s 60-Second Science, I’m Adam Hinterthuer.