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Dietary studies have suggested that people who consume large amounts of vitamin A in foods, multi vitamins, or both are more likely to suffer hip fractures than are people who ingest modest amounts.
New evidence bolsters these findings. Researchers have now correlated men’s blood concentrations of vitamin A with a later incidence of broken bones: a comparison that avoids the vagaries that plague diet-recall studies.
Taken together, the new work and the diet studies raise knotty questions about the maximum amount of vitamin A that a person can safely ingest each day, says study coauthor Karl Michasson, an orthopedic surgeon at University Hospital in Uppsala, Sweden. He and his colleagues report the new findings in Jan. 23 New England Journal of Medicine.
In the United States, the average daily intake of vitamin A through food, specially fish, eggs, and meat, is roughly 2,600 IU (international units) for men, and many multi-vitami
A. a man taking large amounts of vitamin A will suffer hip fractures.
B. the maximum of vitamin A a man takes every day should be within 3,000 IU.
C. the more a man consumes vitamin A every day, the higher chance he suffers hip fracture.
D. the less a man consumes vitamin A every day, the higher chance he stands of good health.
Culture shock is an occupational disease for people who have been suddenly transplanted abroad. Like most illnesses, it has its Own symptoms and cure. Culture shock is caused by the anxiety that results from losing all familiar signs and symbols of social intercourse. These signs include the thousand and one ways in which we orient ourselves to the situation of daily life: when to shake hands and what to say when we meet people, when and how to give tips, how to make purchases, when to accept and refuse invitations, when to take statements seriously and when not. These signs, which may be words, gestures, facial expressions, or customs, are acquired by all of us in the course of growing up and as much a part of our culture as the language we speak or the beliefs we accept. All of us depend for our space of mind and our efficiency on hundreds of these signs, most of which we do not carry on the level of conscious awareness. Now when an individual enters a strange culture, all or m
A. like all other diseases it has its own signs and cure
B. only those who engage in culture work suffer from it
C. it is hard to get rid of
D. only those living in a strange culture may experience it
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