洋蔥可能具有抑止骨質流失的作用英語美文

　　瑞士科學家日前發現，洋蔥除了作為一種食品能為人們的餐桌增色不少之外，他們的一項初步研究結果還顯示，洋蔥可能還具有抑止骨質流失的作用，有助于防止骨質疏松癥的發生。

　　Onions can spice up your meals -- and maybe strengthen your bones, preliminary study findings suggest.

　　據路透社4月7日報道，瑞士伯爾尼大學的研究人員發現，實驗室的老鼠在吃完添加了少量洋蔥的食物后，較之以前明顯不易發生骨質流失了。這項研究的發起人魯道夫·布倫艾森博士說，研究結果顯示，在食物中添加洋蔥或許會幫助人們避免骨質疏松癥的發生。他還說，人們每天應該食用至少400克(或者14盎司)的洋蔥，這樣才和實驗中給老鼠喂食的洋蔥量相當。

　　為進一步弄清食用洋蔥是否有助于骨骼強壯及骨骼健康，布倫艾森博士和他的同事在實驗室中給老鼠喂食了1克的洋蔥，隨后對它們的骨骼進行了測試。結果顯示，食用洋蔥之后，老鼠骨吸收(骨骼中礦物質發生流失，骨質疏松癥的顯著特征)明顯減少。布倫艾森說：“添加在老鼠食物中的洋蔥明顯抑止了骨吸收�！�

　　為了探明究竟是洋蔥中的什么成分在起作用，研究人員用洋蔥榨取物中的不同成分和骨細胞混和。結果發現，一種被稱為gamma glutamyl peptide的成分在抑止骨吸收上效果最為明顯，研究者認為這就是為什么洋蔥洋蔥可抑止骨流失，對骨骼有好處的原因。

　　布倫艾森博士和他的同事以前曾向人們指出，其它的一些蔬菜和水果在實驗中也可以抑止老鼠的骨流失現象。另外，乳制品也對人的骨骼大有好處。

　　Onions can spice up your meals -- and maybe strengthen your bones, preliminary study findings suggest.

　　Investigators from the University of Bern in Switzerland found that after eating a small fraction of an ounce of onion with their food, rats became significantly less likely to lose bone.

　　These findings suggest that adding onion to food may help people fight off the bone-thinning disease osteoporosis, study author Dr. Rudolf Brenneisen told Reuters Health.

　　He added that people would need to eat at least 400 grams - or 14 ounces - of onions each day to equal the amount rats ate during the study.

　　Brenneisen noted that this is not the first study to show that what you add to your food can add to the health of your bones. For instance, he and his colleagues have shown that other vegetables and fruits may also inhibit bone loss in rats.

　　The researcher added that people using diet to strengthen their bones should make sure to include dairy products, since those foods can also strengthen bones.

　　To look further into whether onion helps keep bones strong and healthy, Brenneisen and his colleagues fed rats 1 gram of onion, then tested them to see how their bones were faring.

　　The findings, which appear in the Journal of Agricultural and Food Chemistry, show that after eating onions, the rats underwent significantly less bone resorption, the loss of minerals from the bones that characterizes osteoporosis. "Onion added to the food of rats inhibited significantly bone resorption," according to Brenneisen.

　　To investigate what in onions was helping bones, the researchers mixed different components of an onion extract with bone cells.

　　One onion ingredient --called gamma glutamyl peptide -- appeared to be most effective at inhibiting bone resorption, suggesting it is responsible for onion"s bone-boosting effects, the authors note.

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