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Targeting Trans Fats
Even the least
attentive consumer must have noticed the term "trans fat" lately. In the news,
on grocery shelves, in restaurant advertising, and on magazine covers, "trans
fat" has taken center stage among nutritional buzzwords. But what does it
mean?
Every member of the
modern American food chain-providers, selectors, buyers, preparers,
eaters-needs to understand how dangerous trans fats can be. The Texas
Department of Agriculture (TDA) presents this article to provide background,
suggestions and resources about trans fats.
WHAT is the
problem?
Although trans fats
occur naturally in some animal products like beef and dairy, synthetic trans
fats are causing the public alarm. About 80 percent of the trans fats
Americans consume is from sources that do not occur naturally. Synthetic trans
fats are formed when hydrogen is added to a liquid vegetable oil to make it
solid at room temperature. If an ingredient list includes "partially
hydrogenated oil" or "vegetable shortening," it means that food contains
synthetic trans fat.
Trans fats are trouble
because of what they do to people's cholesterol. There are two kinds of
cholesterol: LDL is the "bad," artery-clogging kind. HDL is the "good," LDL-removing
kind. It is well known that saturated fat boosts harmful LDL, while
unsaturated fat boosts protective HDL. We are just learning that trans fats
both raise LDL and lower HDL, dramatically increasing the
risk of heart disease and stroke.
WHO is doing
something about it?
The first step was in
2003, when the U.S. Food and Drug Administration (FDA) passed
a rule that food manufacturers must list trans fat on their nutrition labels
by 2006.
In 2007, the Texas
legislature passed a bill requiring TDA to prepare a report
on trans fats. The report, due in December 2008, is to "detail all
initiatives, proposals, and programs that the department and the United States
Department of Agriculture are then currently conducting or planning to conduct
and include the department's recommendations for legislative action to assist
in reducing trans-fatty acids from school meals." Before the end of the
2007-2008 school year, TDA will be collecting information from Texas
nutrition programs about their recent bid awards and any current
initiatives to curb the use of trans fats.
WHY did trans
fats emerge?
Liquid oils like olive
oil and sesame oil have been used in cooking since ancient times. By the end
of the 19th century, less expensive food crops like soybean, corn,
and peanut were also becoming popular as food oils. Before the early 20th
century, the only solid shortenings for baking were butter and lard.
In the early 20th
century, scientists developed a way to combine the inexpensiveness of
vegetable oil with the usefulness of solid fats: hydrogenation. Vegetable
shortening quickly caught on in home and commercial kitchens. It is easy to
use in baked goods, lasts longer as a frying medium, and helps products stay
fresher longer.
At first the appeal
was its low price, but as Americans started to understand the health effects
of dietary saturated fat from animal sources in the 1950s, vegetable
shortening like margarine also gained ground as a supposedly healthy
alternative to butter. Only in the last decade has it become clear how
mistaken that belief was.
HOW can we reduce
the risk?
The National Academy
of Science suggests that "trans fatty acid consumption be as low as possible
while consuming a nutritionally adequate diet." The American Heart Association
is more specific, recommending that people eat no more than 1% of their daily
calories from trans fat. That works out to about one gram of trans fat per
1,000 calories consumed. The FDA makes no recommendation at all, since there
is no known safe level of trans fats in the diet.
Fried items like chips
and French fries and baked goods like breads and sweets account for more than
half of the trans fats in American diets. The most important step toward
avoiding trans fats is to read nutrition labels. Those who make food choices
for others-parents, caregivers, and meal providers-can take the extra step of
insisting that food makers provide healthful alternatives to trans fats.
Visit these
Web sites for more information about reducing the risk from trans fats:
Dietary Guidelines for Americans 2005--Chapter 6: Fats (USDA)
Talking about Trans Fat: What You Need to Know (USDA)
Trans Fat: A Cholesterol Double Whammy (Mayo Clinic)
Trans Fats (American Heart Association)
What Every Consumer Should Know About Trans Fatty Acids (FDA)
Revealing Trans Fats (FDA)
Questions and Answers about Trans Fat Nutrition Labeling (FDA)
Backgrounder: FDA Acts to Provide Better Information to Consumers on Trans
Fats
How to Understand and Use the Nutrition Facts Panel (FDA)
Trans Fats--What Is the Big Deal? (Alexandria City, Virginia, Public Schools)
Heart Disease: Facts and Statistics (Centers for Disease Control and
Prevention)
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