March
2004 Newsletter
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Asia
Pacific Journal in
the NEWS
on Red
meat
The
March 2004 issue of the journal contains
2 articles in the "News and Views"
section on red meat:
1. Summary of
a Scientific Meat Nutrition Workshop hosted
by the New Zealand
Beef and Lamb Marketing Bureau
2. Raising meat consumption in a contempory
world
by Dr Noel Solomon and Professor Annie
Anderson
Read both articles to get
the pros and cons about what the scientific
community is saying about red meat and
health. click
here
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WHAT'S
NEW IN NUTRITION RESEARCH
Raw
food diets
Have
you heard people say that "to get
the most nutrients from foods, especially
fruits and vegetables, that uncooked is
better than cooked". There is no
scientific justification for the promotion
and consumption of raw food diets. Cooking
serves several useful purposes: it kills
harmful bacteria; it makes food softer
to chew; it
improves the digestion of foods;
it breaks down nutrients like proteins
and improves their digestion; some nutrients
are lost during cooking, but others (especially
antioxidants) become more available to
your body - for example more antioxidants
are abosorbed into the blood stream from
cooked carrots/ corn/ tomatoes/leafy greens
than from their uncooked versions; cooking
makes some nutrients (e.g proteins common
in beans, seeds, sprouts) non-toxic. Apart
from some vitamin losses, there is no
other proven detriment of cooking food
(as long as it is not charred/burnt in
the process) and there are several benefits.
It is also a myth that we need to eat
raw food in order to obtain beneficial
'enzymes'. Most enzymes consumed are inactivated
by acid in our stomach and enzymes in
our intestine. Verdict: eat a variety
of foods, in a variety of forms.
Myths
- Acid foods
Some
people believe that 'acid' foods make
the blood/body more 'acid' and that this
is bad for you. This belief does not make
physiological sense and is completely
unscientific. There are foods that create
acid or alkaline ash, but this affects
the pH of urine only. There is no food
that will alter the pH level of your body
- your blood and organs are tightly buffered
to maintain the pH level within very close
limits.
However, if you consumed a whole bottle
of antacids at once your blood would become
more acid. The consumption of acidic foods
like lemons and vinegar would not alter
the level of acid in your blood stream
because your stomach produces hydrochloric
acid to aid in the digestion of these
foods and then when the stomach empties
into the intestine the pancreas neutralises
the acidity with an alkaline solution
containing enzymes. Your body responds
very quickly to any changes to blood acidity
so the pH of your blood does not vary
as a consequence of eating.
Mercury
in fish
Fish
is an excellent source of protein, omega
3 oils and iodine and has been shown to
be beneficial to health,
if eaten several times a week. For this
reason the National Health and Medical
Research Council and Australian Heart
Foundation recommends we eat one to two
fish meals a week. However, fish has recently
been reported to contain mercury (a pollutant
in the environment) - excess mercury appears
to affect the nervous system causing numb
or tingling fingers, lips and toes,
can cause developmental delays in walking
and talking in children and muscle and
joint pain.
So does this
mean we should avoid fish?
According to Food Standards Australia
and New Zealand (FSANZ) we should continue
eating several serves of fish and seafood
per week but avoid
fish high in mercury like: shark, swordfish
(broadbill) and marlin. These are
long-living predatory fish that accumulate
mercury in the form of methyl mercury.
Fish previously classed as high in mercury
but now off the high-mercury list are
ray, gemfish, ling and southern blue fin
tuna. Pregnant women, women planning pregnancy
and children up to six years old are also
advised to restrict consumption of orange
roughy (sea perch) and catfish. Nursing
mothers are advised that if they want
to be cautious they should also follow
the advice for pregnant women. More info
at: http://www.abc.net.au/rn/talks/8.30/helthrpt/stories/s940899.htm
http://www.foodstandards.gov.au/
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RESOURCES
ON THE WEB
http://www.freshforkids.com.au
- interactive website for
kids and teachers on fresh fruit and vegetables.
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