Extract:
Caffeine and Pregnancy
The health risks of coffee have long been debated, but a recent study has added another argument against too much coffee consumption. This study looked at the effect of drinking coffee on pregnant women. Conducted by physicians at Kaiser Permanente, the study explored the connection between caffeine and the risk of miscarriage.
This study followed more than 1,000 women who became pregnant within a two year period. The amount of caffeine they drank was logged, as well as which women experienced a miscarriage. The results, as published in the January 2008 issue of the American Journal of Obstetrics and Gynecology, stated that the risk of miscarriage more than doubled in women who consumed 200 mg or more of caffeine per day, about what is found in two cups of coffee.
Why does caffeine carry this risk? Researchers are not sure, but they theorize that the caffeine restricts blood flow to the placenta. This, in turn, can harm the developing fetus. Does this mean the physicians will start advising women to quit drinking coffee while pregnant? Yes and no. Some doctors will certainly take this report to heart and encourage their patients to stay away from more than one cup of coffee a day, just as they recommend not drinking alcohol or smoking cigarettes. Others are not so convinced and doubt that this single study is enough to overturn the established guidelines of the American College of Obstetricians and Gynecologists. Instead, they believe that a lot more research needs to be done.
What is the main idea of the passage?
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A
Coffee carries some obvious health risks for people.
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B
Two cups of coffee a day may be enough to raise the risk of miscarriage
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C
There is a link between miscarriages and morning sickness.
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D
Miscarriage rates are on the rise internationally.
The main idea is that two cups of coffee a day may be enough to raise the risk of miscarriage, capturing the study's central finding about caffeine threshold effects.
A) Coffee carries some obvious health risks for people.
Too broad, the passage focuses specifically on pregnancy/miscarriage risk, not general population health effects.
B) Two cups of coffee a day may be enough to raise the risk of miscarriage.
Directly supported by the study's key finding: "risk of miscarriage more than doubled in women who consumed 200 mg or more of caffeine per day, about what is found in two cups of coffee", establishing this specific threshold as the central discovery.
C) There is a link between miscarriages and morning sickness.
Never mentioned, the passage discusses caffeine/miscarriage connection without referencing morning sickness.
D) Miscarriage rates are on the rise internationally.
Never mentioned, the passage presents a single study's findings without discussing temporal trends in miscarriage rates.
Conclusion
Main ideas must encompass a passage's comprehensive focus, not broad generalizations or unmentioned topics. Option B successfully captures the specific caffeine threshold finding that constitutes the study's primary contribution to pregnancy health knowledge.