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The
Truth behind Trans Fat
http://www.mealplans101.com
The nutrition world is
consistently changing; one year margarine is better than butter
and the next year it’s reverse. Yesterday we’re told
to avoid eggs, yet tomorrow we should. With all these confusing
messages, it is not surprising that many people are confused. Consumers
consistently ask us what is the best diet plan? Let’s delve
into the details of how to make smart decisions when fueling your
body for optimal performance. First up, trans fats.
Scientists have really
caught on to the dangers of regular consumption of trans fat. As
a result, it is mandatory for companies to list trans fat as of
January 2006.
Primer on Fats
All fats have the same
basic structure; they are a chain of carbon atoms with varying amounts
of hydrogen atoms attached to each carbon. This is important to
understand the next piece to this article. Let’s delve into
some simplified chemistry:
Think of the structure
of fats as a school bus; the bus itself is the carbon atom chain
discussed above and all the seats are the hydrogen atoms.
• Saturated Fat:
all the carbon atoms are full of hydrogen atoms, the “seats
on the bus” are full. No other atoms can fit onto the structure
because there are no “empty seats.” Saturated fats are
easy to identify because they are solid at room temperature (butter,
shortening, animal fats, etc).
• Monounsaturated fat: (mono, meaning one) fats: there is
one “empty seat” on the bus and the rest are full. There
is room to fit more hydrogen because of the one “empty seat.”
Monounsaturated fats are liquid at room temperature (vegetable oils,
like olive oil, canola oil, etc).
• Polyunsaturated (poly, meaning many) fat: several of the
“seats” are empty. Polyunsaturated fats are also liquid
at room temperature (flax oil, fish oil, etc).
Where do trans
fats fit?
Trans fats are basically vegetable fats that have been changed chemically
by a process known as hydrogenation. Remember the monounsaturated
fats from above had one empty “seat” without a hydrogen
atom. The process of hydrogenation or partial hydrogenation is when
food manufacturers artificially add hydrogen to unsaturated fats
to provide greater stability and, ultimately, longer shelf life
in addition to a more desirable texture; hydrogenation makes liquid
fats solid at room temperature. For these reasons, it has been used
in food manufacturing for quite some time.
Downside to trans fats
The problem is the body treats the hydrogenated fat like it's a
saturated fat. Trans fats have adverse actions on lipid profiles
since they raise LDL, the “bad” cholesterol that contributes
to plaque formation, and decrease HDL, the “good” cholesterol,
which offers defense against artery clogging fats. Trans fats also
negatively affect plasma markers of inflammation and reduce endothelial
function, which are all subsequently associated with an increased
cardiovascular disease risk. Similar results have been realized
not only for those with preexisting heart disease but they also
occur in healthy individuals.
Table 1: Select
foods that commonly
(not always) contain trans fats
Most baked goods
Margarines
Crackers
Cookies
Shortening
Cereal
Breads
Pastries
Breadcrumbs
Pie crusts
Cakes
Non-natural peanut butter
French fries
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Therefore, with these negative
health outcomes clearly correlated to trans fats, it is important
to discuss specific foods they may be found in (Table 1), suggested
intakes, how to avoid them, and the new labeling laws that will require
trans fat be listed on food labels. These tips may help provide insight
into the world of trans fats.
Is there a suggested intake for trans fats?
There is no suggested
intake for trans fats. However, it is suggested that intakes are
lowered as much as possible since there is no requirement for trans
fats in the diet.
How can someone
tell if a product contains trans fats?
The simplest way is to read the ingredient panel; if hydrogenated
or partially hydrogenated oils are listed, it contains some trans
fats. In 2006 it will be mandatory for all food manufacturers to
list trans fat on their product’s nutrition facts panel. This
will be listed on a separate line, under saturated fat.
How can the ingredient list say hydrogenated or partially
hydrogenated, but list 0 grams of trans fat?
Some products may contain low amounts of trans fats, but still list
zero trans fats on the food label. Remember, if the ingredient list
says hydrogenated or partially hydrogenated oils, the food contains
trans fats. Food manufacturers are allowed to list the amount of
trans fats as zero, if, and only if, each serving contains less
than 0.5 grams of trans fat. Keep in mind that this is per serving,
so if it’s normal to sit down with a container of non-natural
peanut butter on your lap and eat it by the spoonful, the normally
low amount of trans fats in each serving will quickly add up. Of
course the calories will too, so this practice is not recommended
at all.
Take home message
When searching through
the endless amounts of hype to find out what is the best diet plan,
it’s important to look at the amount of packaged foods included,
since they often contain trans fat (and a whole slew of other unhealthy
ingredients) and pick the diet plan that uses the most fresh and
least processed foods available.
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