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  3. Can Added Calcium Help Older Bones? New Zealand researchers say guidelines advising seniors to consume at least 1,000 to 1,2

Can Added Calcium Help Older Bones? New Zealand researchers say guidelines advising seniors to consume at least 1,000 to 1,2

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问题                  Can Added Calcium Help Older Bones?
    New Zealand researchers say guidelines advising seniors to consume at least 1,000 to 1,200 milligrams of calcium a day are misplaced.
    No proof was found that boosting calcium intake beyond normal dietary levels strengthens older bones or prevents fractures, said researcher Dr. Mark Bolland, a professor at the University of Auckland. "We’ ve gathered all the clinical studies of calcium supplements and dietary calcium intake for both bone density and fractures," said Bolland. " Taken together, we think this is the strongest possible evidence that taking calcium supplements will not be beneficial unless there are clear medical reasons that a calcium supplement is needed," he said.
    Moreover,excess calcium supplementation can be harmful, he and other experts said. "The findings probably will surprise clinicians and patients" , Bolland said, " because they have received very strong messages for many years about the importance of calcium for bone health in guidelines for osteoporosis(骨质疏松症)management and by osteoporosis advocacy groups.
    "Clinical trials have shown that calcium supplements often cause minor gastrointestinal(胃肠的)side effects such as constipation(便秘)" ,Bolland said. "They also cause a small increased risk of kidney stones, heart attacks, high calcium levels and hospitalization with acute gastrointestinal symptoms. "He also said. "The small risk of these important adverse effects,together with the moderate risk of minor side effects such as constipation, outweighs any benefits of calcium supplements on fracture. "
    However,Dr. Duffy MacKay,president for the Council for Responsible Nutrition,disagreed with Bolland’ s conclusions, and countered that scientific evidence does show that calcium reduces fracture risk. "The degree of benefit varies from study to study, "he said. "However, the largest benefit is generally found in those who take their calcium supplements throughout the entirety of a study. Other important factors that influence the benefit of calcium supplementation include giving calcium supplements with other important bone nutrients including vitamin D and vitamin K. "
Dr. Bolland says that calcium intake beyond normal dietary levels has______.
选项 A、a positive effect on older bones
B、an effective power on healing fractures
C、not been beneficial to the legs
D、not been proved effective
答案D
解析 由第二段Bolland的话“No proof was found…prevents fractures”可知，并没有证据表明超过每日所需摄入量的钙能够强健骨骼或是预防骨折。故选D。
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