VOA慢速英语2017--少吃会帮助你活得更久吗?
时间:2018-12-07 作者:英语课 分类:2017年VOA慢速英语(三)月
From VOA Learning English, this is the Health & Lifestyle report.
If you want to slow aging, you might want to eat less. Researchers in the United States say eating less can slow the aging process of cells in the body.
This finding is good news – if you are a mouse. The researchers studied mice, not people.
John Price is a biochemistry professor at Brigham Young University in the U.S. state of Utah.
He and other researchers studied two groups of mice. One group was able to eat as much as it wanted. The researchers restricted what the other animals in the other group ate. Their diet had 35 percent fewer calories than the first group of mice.
Price says the mice with the diet restrictions 2 were “more energetic and suffered fewer diseases.” They were not just living longer, they seemed to stay younger for a longer period of time.
Price says that when you restrict calories (in mice), there is a direct increase in lifespan – the average age of the animal. He and his team found that calorie “restriction 1 caused real biochemical changes that slowed down the rate of aging."
But how?
The researchers found that fewer calories slow down a natural mechanism 3 in cells called ribosomes. Price explains that ribosomes are responsible for making important proteins in the cells. But with fewer calories, they slow down. This gives the cells more time to repair themselves.
The University of Utah researchers say ribosomes use from 10 to 20 percent of the cell's energy to make those proteins.
In a press release on the study, Price wrote that "because of this, it is impractical 4 to destroy an entire ribosome” when it starts to break down.
However, “repairing individual parts of the ribosome on a regular basis enables ribosomes to continue producing high quality proteins for longer than they would otherwise. This top quality production, in turn, keeps cells and the entire body functioning well."
Price used automobiles 5 to explain how ribosomes repair themselves. He said that a “ribosome is a very complex machine,” like a car.
Ribosomes, likes cars, need “maintenance to replace the parts that wear out the fastest. When tires wear out,” he explained, “you don't throw the whole car away and buy” a new one. It costs less to replace the old tires.
Earlier studies have suggested a link between calorie restrictions and slowed aging. However, this is first to show how the ribosomes can influence aging.
Price noted 6 calorie restriction as a way to slow aging has not been tested in humans. But he adds that the main finding for people is the "the importance of taking care of our bodies."
"Food,” he said, “isn't just material to be burned -- it's a signal that tells our body and cells how to respond.”
Price said the findings help to explain how exactly our bodies age. And this may “help us make more educated decisions about what we eat."
Words in This Story
calorie – n. an amount of food having an energy-producing value of one large calorie
biochemical – adj. represented by, produced by, or involving chemical reactions in living organisms
mechanism – n. a process or system that is used to produce a result
impractical – adj. not easy to do or use
regular – adj. happening or done very often
basis – n. a fixed 7 method or system for doing something
functioning – v. to work or operate
maintenance – n. the act of keeping property or equipment in good condition by making repairs or correcting problems
- The park is open to the public without restriction.这个公园对公众开放,没有任何限制。
- The 30 mph speed restriction applies in all built-up areas.每小时限速30英里适用于所有建筑物聚集区。
- I found the restrictions irksome. 我对那些限制感到很烦。
- a snaggle of restrictions 杂乱无章的种种限制
- The bones and muscles are parts of the mechanism of the body.骨骼和肌肉是人体的组成部件。
- The mechanism of the machine is very complicated.这台机器的结构是非常复杂的。
- He was hopelessly impractical when it came to planning new projects.一到规划新项目,他就完全没有了实际操作的能力。
- An entirely rigid system is impractical.一套完全死板的体制是不实际的。
- When automobiles become popular,the use of the horse and buggy passed away. 汽车普及后,就不再使用马和马车了。 来自《简明英汉词典》
- Automobiles speed in an endless stream along the boulevard. 宽阔的林荫道上,汽车川流不息。 来自《现代汉英综合大词典》