The Cranberry Cure
The cranberry bush (Vaccinium macrocarpon) is a
low-growing evergreen shrub with leathery leaves and bright red berries.
This member of the heath family grows in mountains, forests and damp bogs
from Alaska to Virginia. However, most of the commercial berries are
produced in Massachusetts and Wisconsin.
Native Americans used cranberries for both food and medicine. The berries
were enjoyed either raw or sweetened with maple sugar. In addition, they
used them in sauces, bread, and puddings, and used cranberries in poultices
for treating wounds. Cranberry leaves were typically used for diarrhea and
urinary disorders. The sailors during colonial days used cranberries to
Today, cranberry is available in a variety of products such as frozen
cranberries, cranberry juice, and juice cocktails, cranberry sauce and
capsules containing cranberry powder. Cranberry sauce or jelly are commonly
used during the year-end holiday season. The most popular form of
cranberries is the sweetened cranberry cocktail that contains about 30
percent cranberry juice. Apple cranberry and other cranberry drinks only
contain about 10 percent juice.
Cranberries are distinguished by their extremely sour taste, due to their
low sugar and high acid content.
are rich in citric, malic, quinic and other acids. They also contain
flavonoids, anthocyanins, ellagic acid, and vitamin C. Because of their
tannin content, the berries possess a natural astringency.
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Help for Infections
Cranberries have longed been considered valuable for maintaining the
health of the urinary tract
. The juice has been widely used for the prevention, treatment, and
symptomatic relief of urinary tract infections. It was commonly believed
that cranberry juice was effective because it acidified the urine. The high
acidity was believed to prevent bacterial growth.
However, recent research supports the notion that cranberries contain
substances that prevent the adhesion of E coli and other bacteria to the
lining of the urinary tract. The bacteria adhere to the urinary tract by
way of many fimbriae, hairlike projections on the surface of the bacteria.
This allows the bacteria to colonize in large numbers and produce an
infection. Recently, researchers identified proanthocyanidins in cranberry
juice which inhibit the E. coli from adhering to the lining.
Urinary tract infections (UTIs) pose a serious health problem affecting
millions of Americans every year. UTIs are more prevalent among women than
in men, and many women will develop several UTIs in their lifetime. The
risk of a UTI increases with advancing age, and is greatest among
institutionalized older women. In addition, people with diabetes are at
higher risk for UTIs.
Symptoms commonly experienced with a UTI include painful urination, the
need to frequently urinate, a cloudy urine, and lower back pain. If a UTI
is untreated, more serious complications may develop. If they occur during
a pregnancy, the infection may cause a pre-term delivery.
A group of 153 elderly women living in a nursing home experienced on
average a 50 percent reduction in the bacterial load and white blood cell
count in their urine after daily consuming 10 ozs. of cranberry juice
cocktail for six months. The elderly women also had a greater possibility
of being free of the infection than similar women not using the cranberry
juice. Capsules containing cranberry concentrate can also be effective.
Women who took two 400 mg capsules of cranberry powder for 3 months
experienced a significant decrease in risk of UTIs.
Cranberry juice is also effective in reducing urinary odors in bedridden
patients who have urinary infections and are incontinent. Nursing home
personnel have observed a decrease in urine odor in the geriatric wards of
a nursing home following the regular drinking of two glasses of cranberry
juice by the patients. In addition, patients complained less about a
burning sensation when they urinated.
What About Other Fruits?
The blueberry (Vaccinium corymbosum), a close relative of the cranberry, is
also a good source of the proanthocyanidins which inhibit the colonization
of certain bacteria. On the other hand, orange, grapefruit, pineapple,
guava, and mango juices do not possess any anti-adhesion properties.
Other Protective Effects
Cranberry appears to possess other benefits for human health. Helicobacter
pylori are the major cause of gastric and duodenal ulcers. This bacterium
penetrates the mucous lining of the gastrointestinal system and adheres to
the underlying epithelial layer. Recently, it was found that a cranberry
fraction disabled some strains of H. pylori so that they could not stick to
the epithelial surface. Through this mechanism, cranberries could help
prevent ulcers. A cranberry fraction also reduces the stickiness of oral
bacteria and may be useful for delaying the development of dental plaque
and gum disease.
Cranberry juice may also prevent the formation of certain types of kidney
stones. A glass or two of cranberry juice every day for 1 to 2 weeks will
increase the acidity of the urine, and decrease the risk of a kidney stone
forming. In addition, cranberry juice does not contain high levels of
oxalate, a substance which can promote the formation of kidney stones.
Protection Against Chronic Disease
Cranberries are rich in polyphenolic antioxidants which protect against
cancer and cardiovascular disease. The proanthocyanidins and other
compounds inhibit the oxidation of LDL cholesterol while cranberry powder
has been observed to decrease the LDL cholesterol levels of animals with
elevated blood cholesterol levels. The proanthocyanidins in cranberry and
lowbush blueberry are known to inhibit tumor growth.
For the prevention or treatment of UTIs a daily glass of cranberry juice,
one to three cups of cranberry juice cocktail, or 10-12 capsules of
cranberry powder are recommended. Generally, there are no side effects.
However, drinking 3 or more liters of cranberry juice per day can produce
diarrhea and other gastrointestinal effects. Lesser amounts may increase
the frequency the bowel movements. It is important that a patient with a
UTI sees their physician.
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