Contrary Opinion by Dr. Gabe Mirkin
(Please Note that Dr. Mirking
offers no scientific evidence other than his very learned opinion and he
specifically relates to Alkaline Food Diets)
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.
Dietary modification 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 body.
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
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 osteoporosis.
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, who practices medicine in Kensington, Maryland, is
board-certified in four specialties: allergy and immunology; sports
medicine; pediatrics; and pediatric immunology. He has served as a
teaching fellow at Johns Hopkins Medical School, Assistant Professor at
the University of Maryland, and Associate Clinical Professor in
Pediatrics at the Georgetown University School of Medicine. He has
written 16 books on sportsmedicine, weight control, and low-fat eating.
His Web site offers broadcasts and reports on thousands of topics. He
also offers a free weekly e-mail newsletter.