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HOW DO WE CONSUME THIS "WONDER"
FOOD?
Tofu, tempeh, soya milk, soya cheese, and
so on, are a few of the foods available that are derived from soya
beans. Until recently, most people in the West thought soya sauce was
the most significant soya-based food. Unfortunately, the variety of soya
foods can confuse consumers and even cause them to shy away from
consuming products that sound just a bit too exotic. But the versatility
of this plant means that it offers something for everyone. Below is a
list of some of the soya products you will find in typical natural food
markets or, quite often nowadays, in conventional grocery stores.
Dried soyabeans:
Although as I have said, soyabeans are a
member of the legume family, and not a bean, they are often used much
like other dried beans. They can be baked or boiled alone or with a
mixture of beans and vegetables and also added to soup and casseroles.
Cooked whole soyabeans retain their fiber.
Fresh Soyabeans:
Although not yet popular in the West,
immature soyabeans can be cooked in the pod, and then removed and served
as a vegetable or as a snack. Some Asian restaurants are now featuring
steamed fresh soyabeans, indicating that this dish may be rising in
popularity. The pod alone is sometimes used in stir fry dishes. It is
not easy to find fresh soyabeans even in health food markets, but this
is likely to change as soya becomes a larger part of our dietary
landscape.
Soya nuts:
These are either dry roasted or deep fried,
and are eaten as a snack food. While an excellent source of protein and
isoflavones, this snack food is high in fat and should be eaten
sparingly, much the way we consume peanuts or sesame seeds.
Soya sprouts:
Sprouted soya beans are high in vitamin C,
as are other sprouted seeds. They can be used raw on salads or cooked in
stir fry dishes. Sprouts of all kinds are more readily available than
they were even a decade ago, and soya sprouts will appear with the rise
in demand. However, soyabeans can be sprouted at home quite easily, in a
manner similar to alfalfa seeds or mung beans.
Tofu:
One the most popular soya products, tofu
comes in many varieties and is used in multiple ways. Also known as bean
curd or Soya Paneer, tofu has been around for a long time--it was probably first
produced about 2000 years ago. One Chinese legend tells us that tofu was
invented by a government official, who, because he refused to take
bribes, was so poor that he experimented with soyabeans and came up with
tofu, a dish he could afford on his modest salary. Another story credits
a Chinese alchemist for inventing, or perhaps we should say,
discovering, the potential of using a by-product of soya milk. Buddhist
monks from China introduced tofu to Japan, where it became a food
considered so important--and sacred--that it is sometimes referred to as
o-tofu, the prefix indicating the designation of "honorable."
(note)
Tofu is produced by adding a curdling agent
to soya milk, thereby separating the substance into curds and whey. The
curds are then put into molds and left to stand, and within a few hours
the curds are formed into firm blocks. Much of the tofu we see in
today's supermarkets is packaged in water to keep it fresh, which is the
way it has been stored for centuries.
Tofu absorbs other flavors, which is why,
in our culture anyway, it is often used as a substitute for meat and
dairy products. Many excellent cookbooks are available that describe how
to use tofu as a substitute for cheese in lasagna, for example, or even
as a substitute for cream cheese in cheese cake. Tofu is also a favorite
protein source for stir-fry dishes and as an addition to miso soup.
Tofu is a low-fat, low-sodium, high-protein
food; because it is a plant food, it contains no cholesterol, and it is
an excellent source of isoflavones. Only a few years ago, tofu was used
as an example of the kind of food "health nuts" consumed, but
today, it has made its way into mainstream markets. In fact, about 75
percent of the tofu consumed in the U.S. is purchased in conventional
supermarkets (note). Asian and vegetarian restaurants frequently feature
dishes using tofu, which is one important way it was introduced in our
culture. Given its availability, it is no longer difficult to add tofu
to your diet; the pumpkin pie you bake for Thanksgiving dinner could
easily substitute tofu for the eggs called for in the recipe and tofu
"egg salad" is becoming a common delicatessen product in
health food markets.
When you shop for tofu you will notice that
it comes in a number of varieties. Today, some tofu is produced in a way
that reduces its fat content, although the fat content is relatively low
in the first place. You would choose firm tofu when you want to maintain
its shape and consistency, in a stir fry dish, for example. You would
choose a silken tofu when a soft, creamy consistency is needed and a
recipe calls for blending or pureeing. Koyodofu is a freeze-dried tofu
product and must be reconstituted before use; yakidofu is lightly
broiled and has a firm texture.
Tofu's high protein content makes it a fine
meat substitute, but like meat, it is not a good source of fiber.
Although it is possible to find fresh tofu in water-filled bins, most
stores in this country carry it prepackaged in water and tightly sealed.
Some tofu is packaged in cartons with a small amount of liquid; it needs
no refrigeration until it is opened. A powdered instant tofu mix is also
available, but it tends to be more expensive than fresh tofu.
Tempeh:
Tempeh is a fermented product made from
soyabeans that have been soaked and cooked to soften them. Like sour
dough bread, tempeh requires a starter substance, which is added to the
cooked beans. This mixture is left for 24 hours and the result is a firm
textured product with a somewhat nutty flavor and a texture similar to a
chewy mushroom. Because tempeh is firm and it can be formed into a
patty, it is used as a substitute for animal products in what in the
West is typically called as "mock" burgers or sandwiches.
This soya product is especially popular in
Indonesia and is considered a national specialty. It has the necessary
characteristics of a dietary staple in that is high in protein and fiber
and is rich in other nutrients. It also has the advantage of containing
Vitamin B-12, which is a by-product of the fermentation process.
Soya milk:
Soya milk is an adequate substitute for
dairy products, without the negative features of dairy, such as
saturated fat. In fact, there is no reason to consume dairy products
when we have soya milk available as a healthful substitute. While it
doesn't taste exactly like cow's milk, the taste is close enough that
most people quickly adjust to it. Using soya milk is an simple way to
add soya products to your diet. Soya milk is made by adding water to
full-fat soya flour or by soaking ground soyabeans in water and turning
the mixture into a smooth liquid. Soya milk has been used as an infant
formula for babies allergic to cow's milk and because it contains no
lactose (a sugar present in cow's milk), adults who do not tolerate
dairy products have a viable--and available--alternative.
Soya milk acts as a calcium sparing food,
meaning that other properties of soya help prevent bone loss. However,
some soya milk products are now fortified with calcium (and other
nutrients as well). Some soya milk producers have reduced the fat
content of their products, making it a very low-fat food.
In recent years, soya milk (and other soya
products too) have become favorites among campers and boaters because it
does not require refrigeration until the package is opened and it is
commonly sold in one- and two-serving containers. Flavored varieties are
also available and some people consume soya drinks much as they would a
milkshake, often with tofu and fruit added. Soya milk "yogurt"
and "ice cream" products are also available.
Miso:
This is another fermented soya product,
made by mixing softened soyabeans, water, and salt into a paste. The
starter substance is made from a grain such as rice or barley.
Traditionally, the mixture is aged in cedar vats and is used to flavor
soup, salad dressings, and other dishes. Miso is a staple food in
Japanese cooking, and a bowl of miso soup is part of a traditional
Japanese breakfast.
Rich in protein and isoflavones, miso also
tends to be high in sodium, so it may not be appropriate for people on
salt-restricted diets. Discussed in more detail in a later chapter, miso
appears to play a role in protecting the body from the harmful effects
of radiation.
Soya
concentrate:
When soya protein is isolated (referred to
as soya protein isolate) it can be sold in powdered form and used in
many products from infant formula to meal replacement preparations used
in weight loss programs. Some athletes regularly use this protein powder
while they are training. If you use non-dairy creamer, it is likely that
you have consumed soya protein isolate because it is used as a
replacement for milk. The powdered form is also used as a meat extender
or as an additive in certain prepared foods.
Soya flour:
Soya flour is actually finely ground
soyabeans. By dry weight it is about 50 percent protein and it is used
extensively in some varieties of commercial baked goods and more
recently is marketed to consumers for home baking. Since soya does not
contain gluten, it is not used for baking that requires yeast. In other
words, you will not find soya used as the primary flour in raised
breads. Soya flour is sold in both full-fat and defatted forms.
Texturized Soya Protein (TSP):
Soya flour can be compressed in such a way
that it becomes a substance with a texture similar to granola. When
reconstituted it is used as a complete meat substitute and soya
"meatloaf," burgers, chili, and other dishes typically use TSP
as their base. TSP is high in protein and is a good source of
isoflavones and certain minerals, including calcium.
There are commercial products that use soya
protein to essentially make imitation cold cuts, hot dogs, and even
bacon. These products may use soya as a base but some also contain
sodium, dyes, and other additives, which make them less desirable foods.
Soyabean Oil:
Soya oil has found a home in many
commercial food products, from salad dressing to baked goods. While it
beneficial in many ways, it should not be over-consumed because it still
adds fat to your diet. As a plant food, soya is low in saturated fat
(about 15 percent). Of the polyunsaturated fat in soya oil, about half
is linoleic acid, a fatty acid we need in small but significant amounts.
In addition, soya oil contains an important and beneficial fatty acid,
linolenic acid, an omega-3 fatty acid found primarily in fish
oils. Omega-3 fatty acids are believed to be helpful in preventing heart
disease. Soya oil is about percent linolenic acid, making it an
important source for vegetarians and others who do not consume fish.
Soya oil is found in so many food products
that it would be difficult to find many commercially prepared baked
goods that do not contain at least some soya oil. Margarines and solid
shortenings contain soya oil, as do many processed meat products. This
does not mean that the products are any more healthful, however. When
soya oil is used commercially it is usually partially hydrogenated,
meaning that it is no longer polyunsaturated and the percentage of
linolenic acid is reduced. In addition, hydrogenation produces a type of
fatty acid that raises cholesterol levels. It is ironic that with all
the health benefits that soyabeans offer, the typical U.S. diet features
large amounts of soya oil, the least nutritionally important component
of this special plant. Of course, this is explained by the fact that the
U.S. is an important producer of soyabeans and soyabean oil is
relatively inexpensive, not to mention versatile. On the positive side,
Vitamin E supplements are also produced from soya oil.
Lecithin is derived from soya oil and you
might recognize it as an emulsifier in foods, that is, it is added to
foods to keep them blended. Some people take granulated lecithin or
lecithin capsules in an attempt to lower their cholesterol. I will
discuss this product in detail in an appropriate chapter.
Soya Sauce:
Virtually everyone has consumed soya sauce,
and it is no doubt one of the most popular seasonings on the planet. It
is a fermented product made from soyabeans and wheat, with aspergillus
mold spores added. It comes in many varieties, from salty and dense to
slightly sweet and light. There are imitation soya sauces on the market,
so we have to read labels carefully if we want the highest quality
product. Tamari is similar to soya sauce and is usually sold in health
food markets. Low-sodium soya sauce and tamari are also available.
These are the most common soya foods you
are likely to encounter. A stroll through a health food market is
instructive in learning just how versatile soyabeans are. While you will
see many products, from many varieties of miso and tofu, you will also
see soya frozen desserts and even cinnamon rolls made with tofu. A food
is not necessarily healthful if it is made with large quantities of
sugar and fat, and commercial products made with soya oil do not make
them "natural" foods. Soya has many uses, but it can be
misused, too. So, be a careful label reader no matter where you shop.
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