On Wed, 22 Jun 2005 12:37:12 -0600, Vittorix wrote in
Post by Vittorix Post by Enrico C Post by Vittorix
Non ho neanch'io certezze in proposito. Cmq, mi pare che gli alimenti
"alcalinizzanti", quindi favorevoli secondo quella teoria, sono per
esempio la maggior parte dei frutti e delle verdure, che introdurrei
in buone dosi anche per altri motivi.
nel link trovi un elenco delle varie sostanze divise per le due
Tieni conto, cmq, che l'ipotizzato effetto acidificante o alcalinizzante
può essere più o meno intenso, e alcuni alimenti (es. il latte) pur essendo
nell'elenco dei cibi "acidificanti", hanno effetto solo leggermente
acidificante, quasi neutro (se non ricordo male discorsi che erano stati
fatti sul newsgroup).
Post by Vittorix Post by Enrico C
In pratica, se il consiglio è "mangiate più frutta e verdura", ben
questo di sicuro. ma vorrei capire quanto c'è di reale in tutto ciò.
Non lo so. Cmq, ecco un'opinione scettica sull'argomento
Acid/Alkaline Theory of Disease Is Nonsense
Gabe Mirkin, M.D.
Have you seen advertisements for products such as coral calcium or alkaline
water that are supposed to neutralize acid in your bloodstream? Taking
calcium or drinking alkaline water does not affect blood acidity. Anyone
who tells you that certain foods or supplements make your stomach or blood
acidic does not understand nutrition.
You should not believe that it matters whether foods are acidic or
alkaline, because no foods change the acidity of anything in your body
except your urine. Your stomach is so acidic that no food can change its
acidity. Citrus fruits, vinegar, and vitamins such as ascorbic acid or
folic acid do not change the acidity of your stomach or your bloodstream.
An entire bottle of calcium pills or antacids would not change the acidity
of your stomach for more than a few minutes.
All foods that leave your stomach are acidic. Then they enter your
intestines where secretions from your pancreas neutralize the stomach
acids. So no matter what you eat, the food in stomach is acidic and the
food in the intestines is alkaline.
You cannot change the acidity of any part of your body except your urine.
Your bloodstream and organs control acidity in a very narrow range.
Anything that changed acidity in your body would make you very sick and
could even kill you. Promoters of these products claim that cancer cells
cannot live in an alkaline environment and that is true, but neither can
any of the other cells in your body.
All chemical reactions in your body are started by chemicals called
enzymes. For example, if you convert chemical A to chemical B and release
energy, enzymes must start these reactions. All enzymes function in a very
narrow range of acidity. (The degree of acidity or alkalinity is expressed
as "pH."). If your blood changes its acidity or alkalinity for any reason,
it is quickly changed back to the normal pH or these enzymes would not
function and the necessary chemical reactions would not proceed in your
For example, when you hold your breath, carbon dioxide accumulates in your
bloodstream very rapidly and your blood turns acidic, and you will become
uncomfortable or even pass out. This forces you to start breathing again
immediately, and the pH returns to normal. If your kidneys are damaged and
cannot regulate the acidity of your bloodstream, chemical reactions stop,
poisons accumulate in your bloodstream, and you can die.
Certain foods can leave end-products called ash that can make your urine
acid or alkaline, but urine is the only body fluid that can have its
acidity changed by food or supplements. ALKALINE-ASH FOODS include fresh
fruit and raw vegetables. ACID-ASH FOODS include ALL ANIMAL PRODUCTS, whole
grains, beans and other seeds. These foods can change the acidity of your
urine, but that's irrelevant since your urine is contained in your bladder
and does not affect the pH of any other part of your body.
When you take in more protein than your body needs, your body cannot store
it, so the excess amino acids are converted to organic acids that would
acidify your blood. But your blood never becomes acidic because as soon as
the proteins are converted to organic acids, calcium leaves your bones to
neutralize the acid and prevent any change in pH. Because of this, many
scientists think that taking in too much protein may weaken bones to cause
Cranberries have been shown to help prevent recurrent urinary tract
infections, but not because of their acidity. They contain chemicals that
prevent bacteria from sticking to urinary tract cells.
Taking calcium supplements or drinking alkaline water will not change the
pH of your blood. If you hear someone say that your body is too acidic and
you should use their product to make it more alkaline, you would be wise
not to believe anything else the person tells you.
Dr. Mirkin is an associate clinical professor of pediatrics at Georgetown
University School of Medicine and is board-certified in four specialties:
allergy and immunology; sports medicine; pediatrics; and pediatric
immunology. He practices medicine in Kensington, Maryland; produces and
hosts a syndicated radio that can be heard online; publishes a monthly
newsletter (The Mirkin Report); and has written books on sportsmedicine,
weight control, and low-fat eating. His Web site contains reports on
hundreds of topics.