单选题
Entire cities and counties have banned them. McDonald's and
Kentucky Fried Chicken have declared to give them up-as have Starbucks, Ruby
Tuesday, and a host of other former sources of sinful pleasures. In response to
the 2006 Food and Drug Administration requirement that trans fats be listed on
nutrition labels, makers of packaged goods have brought their totals down to
zero. Last month, Frito-Lay even got the FDA's blessing to put a claim on
products loaded with healthy, unsaturated fats that replacing bad fats with good
ones may protect against heart disease. Does this mean that
junk food is now the new health food? "No!" says Robert Eckel. immediate past
president of the American Heart Association, whose "Face the Fats"
education campaign points out that a "zero trans fats" label doesn't tell the
whole story. "People know trans fats are not good for them," says Eckel.
"But they do not understand that replacing them with saturated fat is not a good
option." And that, in some cases, is what's happening. Yes, the food industry is
experimenting with ways to keep the saturated fat content low-by using
unsaturated options such as canola and sunflower oils, for example. But some
manufacturers, unwilling to sacrifice taste and texture, are turning back to
less-than-healthful choices such as palm oil and butter. Baked
goods have proved particularly unwilling to change. The solid fats that provide
their light texture and flakiness as well as the rich flavor typically are
either highly saturated or are "partially hydrogenated" oils that contain trans
fats. Makers of fried foods have had an easier task, since certain liquid
unsaturated oils can do as tasty a job. Snack makers, too, have found the switch
to be relatively manageable. Manufacturers are raising
nutrition experts' eyebrows with other tricks, too. Walter Willett, a professor
of epidemiology and nutrition at Harvard whose research showed that trans fats
promote heart disease, says that some companies now are fully, rather than
partially, hydrogenating vegetable oil. Full hydrogenation doesn't create trans
fats as it solidifies the oil, but it does produce an acid; a saturated fat
which seems in preliminary research to promote inflammation, thus contributing
to heart disease. "I'm not in favor of using totally hydrogenated oil
until more is known," he says. A recent study by the
International Food Information Council Foundation shows that about 42 percent of
Americans-a 9 percent increase over last year-are trying to cut back on certain
healthy tats along with trans fats. "All people hear is that fat is bad,
bad, bad," says Susan Borra, president of the foundation. In fact, most people
need more of the good kind.
单选题
McDonald's and Kentucky Fried Chicken have pledged to get rid of