Can eating a chocolate bar every day really prevent age-related memory loss? No. But a new research shows that large amounts of flavones(黄酮), substances found in cocoa,teaand some kinds of vegetables,may improve age-related memory failure.
Dr. Scott Small is a professor of neurology (神经学) at Columbia University in New York City. He is the leadwriter of a research paper describing the effects of cocoa flavones on brain activity. His study involved 37 volunteers aged between 50 and 69. Researchers gave them a high-level flavones drink madefrom cocoa beans or a low-level flavones drink. For a period of three months, somesubjects got 900 milligrams of flavones a day. The others got 10 milligrams of flavones each day. Brain imaging and memory tests were given to each study subject before and after the study. Dr. Small says that the subjects who had the high-level flavones drink showed much improvement on memory tests.
The researchers warn that more work is needed to be done because this study was performed only on a small group. Dr. Joann Manson is the leadresearcher of a four-year study involving 18,000 adults. This study will use flavones capsules. The studysubjects will be divided into two groups and will take two pills per day. The capsules used will all look the same. But one group's capsules will contain flavones, while the other group will take capsules made of an inactive substance, or placebo(安慰剂).
Dr. Manson says it's not necessary for people to start eating more chocolate, because 3 persons would have to eat a huge amount of chocolate to get the same level of flavones given to the rest subjects. He adds many manufacturers have planned to remove the flavonesfromtheir chocolate products. Similarly, Dr. Manson says a cocoa-based flavones extract(提取)maybe developed in the future But he says that more studies are needed to see how much flavones is good for our health.
What was done to thesubjects after Dr. Small's study?
A.They were asked to take a high-level flavones drink. |
B.They were given brain imaging and memory tests. |
C.They were given capsules containing flavones. |
D.They were asked to take two pills of flavones capsules per day. |
What's the similarity of the two experiments?
A.Both use high-level flavones capsules. |
B.The number of the subjects is the same. |
C.Drinks and placebos are used in both experiments. |
D.Thesubjects are divided into two groups in both experiments. |
Why will Dr. Manson carry out the four-year study?
A.To carry out the experiment further. |
B.To prove the first experiment is wrong. |
C.To test how much flavones can improve our memory. |
D.To show eating chocolate is better to improve memory. |
What can we learnfromthe last paragraph?
A.It's not necessary for us to eat chocolate. |
B.In the future we can get flavones without eating chocolate. |
C.The more we eat flavones, the better our healthwill be. |
D.It's easy for people to get the same level of flavones given to the test subjects. |