In recent years, we have heard
more and more about how our diet affect our health , especially in relation to
the production of cancers. Research has shown that our diet contains an
enormous variety of natural mutagens and carcinogens. It is also apparent that
we are ingesting vastly greater qualities of these substances than was
previously suspected. Perhaps this natural chemical product should be primary
concern rather than the mutagenicity of industrial chemicals, food additives
and pollutants in our environment. For example, in 1989 the United States had a
big publicity –generated scare concerning the plant growth regulator Alar,
which is used to delay ripening of apples so that they do not drop prematurely.
Alar was said to be carcinogenic, but when put in perspective with chemicals in
our daily diets , it does not to be so bad. For instance, the hydrazines in a
helping of mushrooms are 60 times more carcinogenic than the Alar consumed in a
glass of apple juice or 20 times greater than a daily peanut butter sandwich,
which frequently contains aflatoxin B. Our diets contain literally millions of
natural chemicals; intact it is not practical to test them all for
carcinogenicity.
Animal tests and the and the Ames
test have been used to evaluate cooked foods for their potential for inducing
cancers; and it has been found that browed sugars or breads contains a variety
of mutagens. In addition, caffeine and its close relative theobromine found in
coffee, tea, cocoa, and some soft drinks may increase the risk of tumors by
inhibiting DNA repair enzymes. Plants synthesize many carcinogenic or
teratogenic chemicals as delense mechanism to ward off the animals that want to
consume them. Examples of plants plant carcinogens include psoralen and its
derivatives, which are widespread in plants and have been used as sunscreen in
France; solanine and chaconine are teratogens and are found in greened
potatoes. Other food that contains natural cicargens includes banana, basil,
broccoli, cabbage, cauliflower, celery, horseradish, mustard turnips, and black
pepper. In addition, red wines are believed to be responsible for the high
incidence of stomach cancers among the French people, although red wine also
seems to decrease the incidence of coronary heart disease. It seems that
nothing can be consumed that does not contain mutagen!
Another big problem with American
diet is the consumption of excess quantities of fats. The average American
consumes 40% of her/ his calories in the form of fat. Comparisons of cancer
death rates in different national populations have provided important clues to
the nutrational causes of cancer. Very
different types of cancers appear in the United States than appear in Japan. In
United States, colon, breast, and prostate cancer are most prevalent, whereas
stomach cancers are in excess in Japan.
When the amount of dietary fat intake is plotted against the number of
death by breast cancer, the results are striking; the more fat in the diet, the
more higher the rate of breast cancer. How might fat intake cause cancer? It
may be caused by rancid fat because it represents a sizable percentage of the
fat are very prone to oxidation, which produces a variety of carcinogenic
compounds. Another likely explanation is that may carcinogens are soluble in
fats and accumulate in the fat of the animals we eat.

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