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| The steep rise in breast cancer over the past fifty years has been blamed on a variety of causes--from late childbearing to pesticides. Now Belgian scientists have evidence that it may be caused by teenagers drinking fizzy soft drinks instead of weak beer. At a meeting in Brussels last week, Jack Janssens of the Limburg University Centre in Diepenbeek described experiments in which teenagers fasted for 12 hours then drank a 330-millilitre bottle of a popular fizzy drink--he won’t divulge the brand--or a bottle of "table beer", a drink containing 1.1 per cent alcohol that was popular in Belgium before soft drinks came on the market. The beer is still served in Belgian hospitals, especially to new mothers. The focus of the study was insulin, the hormone that regulates blood sugar levels. As expected, insulin levels shot up after teenagers drank the sugar-laden soft drinks, but not after the beer, which although it contains complex carbohydrates has few simple sugars. "What was really a new observation," says Janssens, "was that the fatter the teenager was, the more the insulin went up." The insulin levels did not depend on the level of blood sugar or the total weight of an individual, just obesity. Janssens thinks insulin is a key factor in the development of the human breast, because it influences levels of several other hormones, including growth factor, sex steroids and their inhibitory binding proteins. Inappropriate secretion of insulin at a critical phase of development, he says, "might induce lesions in the breast cells leading to breast cancer later in life". He believes his research suggests a vicious circle in which "soft drinks and high caloric foods in pubertal children brings accumulation of body fat and in turn increases the response of insulin". This could lead to loss of sensitivity to insulin, which may have a continuing effect on breast cells. "A history of weight gain in early adult life is associated with an increased breast cancer risk in Western women," says Janssens. Insulin may be the link. In males, a similar effect may lead to testicular or prostate cancer. As for the beer, Janssens couldn’t detect any alcohol in the teenagers’ blood, which shows that they metabolise it efficiently, he says. While insulin may play a role in cancer, he says more epidemiological research is required before blaming soft drinks. Denise Baxter of Brewing Research International in Nuffield, Surrey, also told the meeting that as well as vitamin B, beer contains other anti-cancer nutrients, including antioxidants. The meeting was organised by the Confederation of European Brewers. |
What is not the possible cause for the sharp increase in breast cancer
A．Fizzy soft drink.
B．Pesticides
C．Late childbearing
D．Insulin.
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Englishmen usually don’t ask each other about ___ affairs.
A．public
B．political
C．school
D．private
《诗经》中有这样的句子：“荼蓼朽止，黍稷茂止。”（《周颂·良耜》）；“去其螟螣，及其蟊贼，无害我田稚”（《小雅·大田》）。这些诗句反映了西周（ ）
①出现了小型青铜农具 ②懂得沤制绿肥
③懂得治虫灭害 ④强化社会治安
A．①②③
B．②③④
C．②③
D．②④
有关手术方法的选择，下面最正确的是
A．必须选用提上睑肌迁徙术
B．必须选用提上睑肌缩短术
C．借用上直肌的手术可作为首选
D．必须选用额肌悬吊手术
E．可以选择提上睑肌缩短术或额肌悬吊手术
下列选项中，属于感性认识不同于理性认识的特点的是（）
A.形象性
B.间接性
C.全面性
D.主观性
按照分散系统分类可将气雾剂分成（）
A.溶液型、混悬型、乳剂型
B.高分子、低分子、胶体型
C.真溶液、胶体溶液、低分子
D.溶液型、乳剂型、高分子
E.高分子、混悬型、溶液型