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LOS ANGELES, May 1 (Xinhua) -- Middle-aged adults who sleep too less or too much may be more likely to suffer cognitive decline, a new study suggests.According to the study, less than six hours of sleep each night is considered too little and more than eight hours as too much for middle-aged adults.The study, conducted by researchers at University College London Medical School, was published May 1 in the American medical journal Sleep.The researchers conducted the study in two periods -- the 1997- 1999 period and the 2003-2004 period. The participants were asked how many hours they slept on an average week night, and were asked the same question in 2003-2004 after an average 5.4 years of follow-up.The researchers compared those who reported changes in their sleep patterns with people whose sleep duration stayed the same over the course of the study.In the follow-up, each individual was given a battery of standard tests to assess his or her memory, reasoning, vocabulary, global cognitive status and verbal fluency.The study findings show that women who slept seven hours per night had the highest score for every cognitive measure, followed by those who had six hours of sleep. For men, cognitive function was similar for those who reported sleeping six, seven or eight hours.However, less than six hours of sleep -- or more than eight hours -- were associated with lower scores."Sleep provides the body with its daily need for physiological restitution and recovery," explained Jane Ferrie, a senior research fellow in the department of epidemiology and public health at the school. "While seven hours a night appears to be optimal for the majority of human beings, many people can function perfectly well on regular sleep of less or more hours."However, since most research has focused on the effects of sleep deprivation on biological systems, it is not yet fully understood why seven hours is optimal -- or why long sleeping appears to be detrimental, Ferrie said."Chronic short sleep produces hormones and chemicals in the body which increase the risk of developing heart disease and strokes, and other conditions like high blood pressure and cholesterol, diabetes and obesity," she added.

BEIJING，March 11 (Xinhuanet) --A poor diet during pregnancy may result in health problems such as diabetes for the offspring in later life, according media reports Friday quotting a new research.Based on a study of rats, researchers from the University of Cambridge altered the protein content of the mother's diet during pregnancy as they found that rats were more vulnerable to the effects of diseases if their mothers were malnourished while they were pregnant.Further, the study also showed that an imbalanced diet in the expectant mother can compromise the long-term functioning of a gene in the child. And the gene, named Hnf4a, is believed to play a major role in the development of the pancreas and in the production of insulin.The researchers held similar mechanisms seen in the rat study could occur in humans, and that the effects might be felt by more than just the immediate offspring."What is most exciting about these findings is that we are now starting to really understand how nutrition during the first nine months of life spent in the womb shape our long term health by influencing how the cells in our body age," said Susan Ozanne, senior author of the paper and senior fellow from the Institute of Metabolic Science at the University of Cambridge.And Jeremy Pearson, associate medical director at the British Heart Foundation, said: "The reasons why are not well understood, but this study in rats adds to the evidence that a mother's diet may sometimes alter the control of certain genes in her unborn child.""It's no reason for expectant mothers to be unduly worried. This research doesn't change our advice that pregnant women should try to eat a healthy, balanced diet," he added.

BEIJING, Feb. 10 (Xinhua) -- More than 9,300 kidnapped children in China have been rescued since April 2009 since a nationwide campaign was launched to crack down on human trafficking, according to the Ministry of Public Security Thursday.In a statement, the ministry encouraged the involvement of civilians in providing clues to help the police rescue minors -- especially those being abused and forced to beg on the streets.In less than three weeks, a Chinese microblog called "Street Photos to Rescue Child Beggars" attracted 175,000 followers and posted more than 2,500 images of begging children online for parents to identify.The blog was set up last month by a professor with the Rural Development Institute of the Beijing-based China Academy of Social Sciences. It has helped rescue six children so far.However, the ministry noted in the statement that children kidnapped to become beggars took up only a small portion of all cases of child beggars. In most cases, children were taken to beg along with their parents or relatives.The ministry has urged police authorities across the country to closely cooperate with civil affairs, urban management and health departments in apprehending people who force children to become beggars.

BEIJING, March 4 (Xinhuanet) -- Well-educated and well-paid single Chinese women were at the forefront of a boom in travel by the country's women in 2010.According to the 2010 Trend Report of Women's Travel, the amount of travel by Chinese women increased by 20 percent last year, with well-educated and well-paid single women becoming the main force in the tourism market.Travel expenditure per capita by women on the Chinese mainland was 4,300 yuan (5) in 2010, and the 20-percent year-on-year rise was much larger than the 9- percent increase for men.Qunar.com, the world's largest online travel search engine in Chinese, released the report. The Beijing-based site was launched in 2005. According to Dai Zheng, vice-president of Qunar.com, women's growing spending power has led to more of them choosing travel as a way to cosset themselves, especially well-educated and well-paid single women, who travel for relaxation and self-improvement.Zhang Jing, 31, who works for a consulting company in Shanghai and earns nearly 20,000 yuan monthly, spent 15,000 yuan on travel last year, including a trip to the Tibet autonomous region in Southwest China and another to Singapore."Travel not only releases work pressure, but also opens up my horizon on the world. I like to see and experience how others live," said Zhang, who plans to visit Thailand in May with two female friends who are both around 30 years of age."Women are active in all of our travel projects. I definitely feel that it's mostly women who are interested in our products," said Zhao Huijin, who works in the booking center of the E-commerce department of China International Travel Service (CITS).Zhao's remarks to China Daily were echoed by the report, which said more than 65 percent of decisions about travel products and travel expenditure were made by women.In addition, women tended to be more demanding of hotels, and preferred to comment and find fault with hotels. On the forum at Qunar.com, women made nearly 70 percent of the comments on hotels.Women's more active participation in travel means that when the industry's decision-makers develop new travel products they take greater note of women's views about travel.In recent years, products targeted at women have appeared, such as women's hotels, certain hotel floors especially reserved for women, and travel themed around shopping, healthcare and relaxation.Le Meridien, a five-star hotel in Xiamen, Fujian province, set up a floor tailored for women customers in July 2010.Adding to the high quality of certain facilities that women care about most, such as excellent sound insulation, the 32 suites on this floor are also equipped with products especially for women, including fresh fruits, low-calorie food, yoga mats, bath salts, facial masks and hangers for silk clothes."These rooms are warmly appreciated by ladies, and we hope to meet women customers' needs both physically and psychologically through appropriate care," said Wang Yan, assistant manager of the hotel's marketing and communication department.The report also revealed that women's choice of destination is strongly influenced by fashion. They enjoy traveling to scenic spots featured in the latest romantic movies and TV dramas.

BEIJING, May 14 (Xinhua) -- The uranium subsidiary of China Guangdong Nuclear Power Group (CGNPG) has said it is developing two large mines in the mainland.The two mines will be located in south China's Guangdong province and northwest China's Xinjiang Uygur Autonomous Region, according to Saturday's China Daily.The move is likely to add as much as 1,000 tonnes to the country's annual production capacity of the nuclear fuel."The two mines are expected to start operation in 2013, each with an annual production capacity of no more than 500 tonnes," the newspaper quoted Zhou Zhenxing, chairman of CGNPG Uranium Resources Co (CGNPG-URC) as saying.