Why Unfermented Soy Wrecks Your Brain

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Why Tofu Wrecks Your Brain

http://articles.mercola.com/sites/articles/archive/2008/07/24/why-tofu-wrecks-yo\

ur-brain.aspx?source=nl

Eating high levels of some soy products, such as tofu, could raise the

risk of memory loss.

A study that examined more than 700 elderly Indonesians found that high

tofu consumption (at least once a day) was associated with worse memory,

particularly among those over age 68.

Soy contains phytoestrogens, which may heighten the risk of dementia.

However, tempeh, a fermented soy product made from the whole soy bean, has

been associated with better memory. This could be related to the fact that it

contains high levels of the vitamin folate, which is known to reduce dementia

risk.

Sources:

a.. BBC News July 4, 2008

a.. Dementia and Geriatric Cognitive Disorders June 27, 2008;

26(1):50-57 [Epub Ahead of Print]

Dr. Mercola's Comments:

The deceptive hype created by the soy industry -- which in many ways is

not much different than that of the pharmaceutical industry -- has unfortunately

been very successful in convincing millions of people that soy is a health food.

Their brainwashing propaganda has cleverly created " healthy soy " -- one of

the biggest health myths in the health food industry to date.

I recently had the opportunity to interview Dr. Kaayla for my Inner

Circle Experts Series, and I also reviewed her book, The Whole Soy Story, which

covers this issue at great depth. It's a must-read if you're still convinced

that soy is good for you and your children, because nothing could be further

from the truth.

It is crucial, however, to make a distinction between the health effects

from fermented versus non-fermented soy, which I will go over toward the end of

this comment, because as you will see, fermented soy dishes do have some

redeeming qualities that conventional soy products lack.

Perfect Food or Brilliant Propaganda?

In recent years soy has emerged as a 'near perfect' food, with supporters

claiming it can provide an ideal source of protein, lower cholesterol, protect

against cancer and heart disease, reduce menopause symptoms, and prevent

osteoporosis, among other things.

But how did such a 'perfect' food emerge from a product that in 1913 was

listed in the U.S. Department of Agriculture (USDA) handbook not as a food but

as an industrial product?

Lipid specialist and nutritionist Enig, PhD shed some light on this

issue when she said, " The reason there's so much soy in America is because they

[the soy industry] started to plant soy to extract the oil from it and soy oil

became a very large industry. Once they had as much oil as they did in the food

supply they had a lot of soy protein residue left over, and since they can't

feed it to animals, except in small amounts, they had to find another market. "

In short, the soy industry CREATED a market where there was none, to

profit from their waste products. It required multi-million dollar advertising

campaigns and intense lobbying to the Food and Drug Administration (FDA), but

now about three-quarters of U.S. consumers believe soy products are healthy.

It's like a re-run of the water fluoridation propaganda machine, which

began in the 1940s as solution to the fluoride pollution from aluminum plants.

The disposing of fluoride had become a costly problem that needed a radical

solution. The solution was to create the false belief that fluoride had some

health benefit, and today, not only are you likely consuming this toxic waste

product in your municipal tap water, but you may even believe it's good for your

teeth, AND industry is getting PAID rather than paying for toxic waste removal.

Soy has become a grossly misunderstood food category, to be added to the

ranks of coconut oil, saturated fats and vegetable oils. The two former have

gained a negative reputation where a good one actually applies, whereas

vegetable oil, along with soy, have emerged with sparkling reputations that

cover up an unsavory truth.

The Truth About Soy

For just a brief look at what's really going on, consider that numerous

studies have found that soy products can actually:

a.. Increase thyroid damage, especially in women

b.. Increase the risk of breast cancer in women, brain damage in both

sexes, and cause abnormalities in infants

c.. Contribute to thyroid disorders, especially in women

d.. Promote kidney stones

e.. Weaken your immune system

f.. Cause severe, potentially fatal food allergies

Despite these findings, many people still want to believe the hype,

thinking that these studies must somehow be wrong. But the content of soy itself

should be a clue. For example, non-fermented soy products contain:

a.. Phytoestrogens (isoflavones) genistein and daidzein, which mimic and

sometimes block the hormone estrogen

b.. Phytates, which block your body's uptake of minerals

c.. Enzyme Inhibitors, which hinder protein digestion

d.. Haemaggluttin, which causes red blood cells to clump together and

inhibits oxygen take-up and growth

e.. High amounts of omega-6 fat, which is pro-inflammatory

Furthermore, most soybeans are grown on conventional farms that use toxic

pesticides and herbicides, and many are from genetically engineered plants. When

you consider that two-thirds of all processed food products contain some form of

soy, it becomes clear just how many Americans are consuming GM products, whose

long-term effects are completely unknown.

Like Feeding Birth Control Pills to a Baby

One of the most disturbing ill effects of soy has to do with its

phytoestrogens, which can mimic the effects of the female hormone estrogen.

These phytoestrogens have been found to have adverse effects on various human

tissues, and drinking just two glasses of soy milk daily for one month has

enough of the chemical to alter a woman's menstrual cycle.

The FDA regulates estrogen-containing products, however no warnings exist

on soy.

Soy products are particularly problematic for infants, and soy infant

formulas should be avoided at all cost. It's been estimated that infants who are

fed soy formula exclusively receive the equivalent of five birth control pills

worth of estrogen every day!

When testing the blood of soy formula-fed infants, concentrations of

isoflavones have been found to be 13,000 to 22,000 times higher than natural

estrogen concentrations in early life. It should be obvious that the potential

damage to your child can be quite significant. Not to mention the fact that soy

formula lacks other vital nutrients for normal and healthy brain- and biological

development.

Soy Also Contributes to Dangerously Lopsided Intake of Essential Fats

One of the most important things you can do for your overall health is to

balance your intake of omega-3 and omega-6 fats. These two types of fat are both

essential. However, the typical American consumes far too many omega-6 fats in

their diet while consuming very low levels of omega-3.

The ideal ratio of omega-6 to omega-3 fats is probably close to 1:1. But

the ratio of omega-6 to omega-3 today averages from 20:1 to 50:1!

That spells serious danger for your health. Even the mainstream health

media is now reporting that lack of high quality omega-3 is one of the most

serious health issues plaguing contemporary society.

The primary sources of omega-6 are corn, soy, canola, safflower and

sunflower oil; oils that are overabundant in the typical American diet. And when

you consider the fact that some form of soy or corn (oftentimes both) is found

in just about every processed food product on the market, it really helps to

explain these excessive omega-6 levels.

What About Soy as a Source of Protein?

While soybeans are relatively high in protein compared to other legumes,

they are still a poor source of protein because other proteins found in soybeans

act as potent enzyme inhibitors.

These " anti-nutrients " block the action of trypsin and other enzymes

needed for protein digestion, effectively cancelling out any potential benefit

you may have thought it had.

Regular soy consumption can also lead to chronic deficiencies in amino

acid uptake.

It is believed that it is this ability to interfere with enzymes and amino

acids that might be one of the reasons for why soy has such a negative effect on

your brain. Isoflavones in tofu and other soy foods might exert their influence

by interfering with the tyrosine kinase-dependent mechanisms required for

optimal hippocampal function, structure and plasticity.

High amounts of tyrosine kinases are found in your hippocampus, a brain

region involved with learning and memory. One of soy's primary isoflavones,

genistein, has been shown to inhibit tyrosine kinase in the hippocampus,

effectively blocking the mechanism of memory formation.

If You Want to Benefit From Soy, Make Sure it is Fermented !

There are some redeeming qualities to soy, however these are found

primarily in fermented soy products like tempeh, miso, natto and soybean

sprouts.

If you want to get some health benefits from soy, stick to these four

forms and pass on ALL processed soy milks, tofu, soy 'burgers', soy 'ice cream',

soy 'cheese', and the myriad of other soy junk foods that are so readily

disguised as health foods.

The study above affirms this as well, showing that consumption of tempeh

was related to better memory, particularly in participants over 68 years of age.

Their explanation for this difference between (unfermented) tofu versus

(fermented) tempeh is that the fermentation process produces high amounts of

folate, which might have a protective effect against the phytoestrogens.

Additionally, not only does the fermentation process blunt the

anti-nutritive effect of the soybeans' phytic acid, it also produces probiotics

-- the " good " bacteria your body is absolutely dependent on - that increase the

quantity, availability, digestibility and assimilation of nutrients in your

body.

As a side note, formaldehyde (used as a preservative) was also introduced

as a potential culprit rather than the tofu itself in this article. Granted,

formaldehyde is somewhere at the very bottom of the list of things you want to

consume for good health, but even so, there are so many studies confirming the

benefits of fermented soy and the dangers of non-fermented soy products in

general that I believe preservatives play a secondary role in the outcome, if

any.

Soy is a broad and deep subject that cannot be fully covered in a single

article, so for further reading, I recommend you review my related articles

below as well as my Soy Index Page, which contains links to many of my best

articles and important research findings on soy.

Related Articles:

Scientists Protest Soy Approval

Soy and Brain Damage

Soy: Too Good to be True