Is RDA enough?? 
Author Message
 Is RDA enough??

Have there ever been any long term studies on whether or not there are
any benifits of taking dosages of vitamins and minerals beyond the RDA.

For instance, can the healing process be improved by taking an
anti-oxidant preparation of 500mg C, 400IU E plus zinc and selenium?

OR are the RDAs for those nutrients sufficient for all of the bodies'
needs?

I know these are LOADED questions but I have been wondering for some
time now about nutritional supplements because I have always heard that
if you eat a balanced diet, you "do not need" any additional
supplements.

Thanks in advance

DAVE



Thu, 24 Aug 2000 03:00:00 GMT
 Is RDA enough??

Quote:

> Have there ever been any long term studies on whether or not there are
> any benifits of taking dosages of vitamins and minerals beyond the RDA.

> For instance, can the healing process be improved by taking an
> anti-oxidant preparation of 500mg C, 400IU E plus zinc and selenium?

> OR are the RDAs for those nutrients sufficient for all of the bodies'
> needs?

> I know these are LOADED questions but I have been wondering for some
> time now about nutritional supplements because I have always heard that
> if you eat a balanced diet, you "do not need" any additional
> supplements.

> Thanks in advance

> DAVE

        Supplement like crazy. People who chant the I-get-what-I-need mantra
also think God is watching over them.  More later.
--
  Delivering God's Message on Post-Purchase Neglect Syndrome (PPNS),
                AND on the RDA!!
---------------------------------------------------------------------

           Physical Concepts & HoloBarre Fitness Systems, NY  
Facts--cheap   Synthesis--glorious   Nice bodies--nice, but irrelevant
----------------------------------------------------------------------


Thu, 24 Aug 2000 03:00:00 GMT
 Is RDA enough??

Quote:

>Have there ever been any long term studies on whether or not there are
>any benifits of taking dosages of vitamins and minerals beyond the RDA.
>For instance, can the healing process be improved by taking an
>anti-oxidant preparation of 500mg C, 400IU E plus zinc and selenium?

One study using a combination of a few vitamins found that early
dysplastic lesions of the esophagus were prevented using a moderate
2-3 times the RDA of 3 vitamins. Thus, it depends. But will it cure
disease? No. Can it slow progression of some diseases? In some cases,
the answer is an unequivocal yes.

Quote:
>OR are the RDAs for those nutrients sufficient for all of the bodies'
>needs?

Probably only adequate to defend against diseases of deficiency. But
every body's different. Some may need more of some vitamins/minerals,
others less.

Quote:
>I know these are LOADED questions but I have been wondering for some
>time now about nutritional supplements because I have always heard that
>if you eat a balanced diet, you "do not need" any additional
>supplements.

Nobody knows. It's also predicated on some ideal average healthy
individual. A multivitamin is probably adequate supplementation for
most {*filter*}s 20-40 without any disease or who don't drink or smoke or
can avoid other toxic {*filter*}s found in the environment. Older people
might need more of some things, less of others. Kids have different
needs. And then men and women are different. Chronic diseases further
changes the picture: diabetes, AIDS, hepatitis infection, arthritis
all may be offset to some degree by carefully crafted nutrient
regimens. And these will exceed the RDA by a considerable amount.

Yet, definitive clinical data are lacking. So it does remain a bit of
a crapshoot. But one that must be based on one's particular condition
and situation. Factors like smoking, {*filter*}, pharamaceutical or
recreational or over-the-counter drug use can all adversely affect
nutritional status. As well as the diet--some diets may preclude or
diminish individual vitamins or minerals. Supplementation can offset
diet-induced inadequacy.

Way overdoing some individual vitamins (particularly the fat soluble
ones lke A, D, E, K) or minerals (iron, selenium) can pose serious
dangers. Upper limits should probably be observed. Other specific
issues, like avoiding any iron supplementation if you have chronic
hepatitis, must be taken into account. Overall, this is not as serious
a problem (as, say, overdosing on an antibiotic or antihistamine.)
This may help to delineate appropriate ranges of minimum dosages and
maximum dosages for individual and collective use of micronutrients.

Good opening questions. More research will give us better answers.
Some can be done in short studies; most others will require large
cohorts of people over many years.

                George M. Carter



Fri, 25 Aug 2000 03:00:00 GMT
 
 [ 3 post ] 

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