Date: 09/11/ Written by: Jon Barron. © The Baseline of Health Foundation. Benefits & Dangers of Soy Products . Incidentally, soy milk used as a low-fat high-protein dairy substitute has seen the biggest gains in market share. The Truth About Soy: Is Is Healthy or Dangerous? () While it may seem like a good deal, the further out the expiration date, the more likely the soy milk will. effects of soy protein dates back to . This benefit of soy protein was first formally . per day of soymilk with one liter of cow's milk in men .
Soy milk benefits and dangers of dating - 1. Introduction
Furthermore, in contrast to older understanding [ 57 ], there appears to be adaptation to the inhibitory effects of phytate on iron absorption [ 58 ]. Therefore, acute absorption studies may underestimate the bioavailability of minerals from plant foods such as soy. It should also be noted that iron status greatly influences nonheme iron absorption with higher absorption rates being observed in individuals with low iron stores [ 59 ].
Isoflavones Isoflavones are found in many different plant foods but among commonly consumed foods the soybean contains uniquely rich amounts. This point that is illustrated by the difference in isoflavone intake between Asian and non-Asian countries.
Isoflavones occur in soybeans almost exclusively as glycosides [ 68 ] but upon ingestion, the sugar is hydrolyzed thereby allowing absorption to occur [ 69 ]. In fermented soyfoods such as miso, tempeh and natto, considerable amounts of the isoflavones, although to varying degrees occur as aglycones due to bacterial hydrolysis [ 70 , 71 , 72 , 73 ]. There is disagreement over whether isoflavone form affects total absorption; some studies show that in comparison to the glycoside, aglycone isoflavones are absorbed faster and to a greater extent [ 74 , 75 , 76 ] whereas other studies show aglycones are absorbed more quickly but total absorption is the same or even less [ 77 , 78 , 79 ].
In this document isoflavone amounts are expressed in aglycone equivalent weights. In , Setchell et al. Since that time this hypothesis has been hotly debated. Equol does appear to offer health benefits over its precursor daidzein [ 82 , 83 ] in possibly several different areas but especially in the alleviation of hot flashes [ 84 , 85 , 86 ].
However, it also may be that in some cases it is the equol-producing phenotype i. Rodents and non-human primates have been referred to as equol machines because of their ability to so efficiently produce such large amounts of equol in response to daidzein exposure [ 9 ]. Several excellent reviews of equol have recently been published [ 80 , 82 , 86 , 88 ].
Each gram of soy protein in soybeans and traditional soyfoods is associated with approximately 3. Consequently, one serving of a traditional soyfood, such as g of tofu or mL soymilk, typically provides about 25 mg isoflavones.
For this reason they are able to exert estrogen-like effects under certain experimental conditions and so are referred to as phytoestrogens. Note that although research shows isoflavones bind to ERs much more weakly than estrogen, circulating levels of isoflavones in response to the ingestion of approximately two servings of soyfoods are three orders of magnitude higher than estrogen [ 94 ]. This difference in binding and transactivation between isoflavones and estrogen is significant because the two ERs have different tissue distributions and, when activated, can have different and sometimes even opposite physiological effects [ 99 , ].
The reason is that soy contains some very powerful nutrient blockers -- bio-chemicals that stop your body from absorbing nutrients found in the soy…or in any other foods that you eat with the soy. There's nothing evil or sinister or even unusual about this. A number of foods contain similar "anti-nutrients. Thus, soy contains enzyme inhibitors and nutrient binders to prevent just that from happening. For most plants, exposure to water is all that is needed to nullify the anti-nutrients.
That's why sprouting releases so many nutrients in seeds, and it's why we have to soak most beans overnight before cooking them -- to eliminate the "anti-nutrients. Phytates are prevalent in cereal grains and are capable of forming insoluble complexes with calcium, zinc, iron, and other nutrients, thus interfering with their absorption by the body. The soybean has one of the highest phytate levels of any grain or legume, and unlike the phytates in most beans, the phytates in soy are highly resistant to soaking and long, slow cooking.
Soy phytate levels, however, can be significantly reduced through a long period of fermentation. Soy milk is very high in phytates, whereas tofu, because of the precipitation process used in its manufacture, falls somewhere in between. People who consume large amounts of soy milk and tofu as their primary protein sources risk severe mineral deficiencies. The results of calcium, magnesium, iron, and zinc deficiency are well known.
Diets high in phytic acid can be sufficient by themselves to cause rickets. There are four natural sources of trypsin inhibitors: Trypsin inhibitors provide unique processes depending on their source. For example, inhibitors in the seeds of legumes soybean and lima bean act as a feeding deterrent for insects by disrupting proteases in the small intestine. Big agribusiness is trying to expand on this natural function by using it to develop insect resistant transgenic plants.
Of course, that makes the soy even less useful as a food, but at least crop will be bumper. Soybean inhibitors have also been found to contribute to pancreatic hypertrophy in rats, again providing a deterrent to rats thinking of feeding on the soy. Antibodies and lectins are hemagglutinins that you're probably familiar with. Viruses also make use of hemagglutinins to bind to host cells.
Plants such as soy make use of phytohemagglutinins plant based hemagglutinins to defend against pests as they cause key cells in the pests, such as blood cells, to clump together. Levels of phytohemagglutinins are high in soy. Dangers of Soy Protein Isolate and Anti-Nutrients The process of making soy protein isolates involves acid washes, alkaline baths, and high temperatures and, in fact, gets rid of many but not all of the anti-nutrients.
Unfortunately, high temperature processing damages the protein -- it denatures it in a way that makes it harder to break down in the intestinal tract and, ultimately, harder to digest. Understand, certain kinds of denaturing, as provided by stomach acid, unfolds proteins in a way necessary for digestion.
Heat, on the other hand, unfolds them in a way that resists digestion. The bottom line is that even the FDA, in their opinion supporting the use of soy protein isolate, has acknowledged that it must be fortified with extra methionine, lysine, vitamins, and minerals -- either by addition to the soy isolate product, or as provided by other components of the diet.
And that hasn't changed. Estrogen dominance can be a factor in all kinds of problems, including: Excess estrogen is the only known cause of endometrial cancer. Increased risk of breast cancer. Loss of bone mass. Increased risk of autoimmune disorders such as lupus. PMS symptoms such as cramping and bloating -- in addition to depression and irritability.
Menopausal symptoms such as hot flashes and night sweats -- again, in addition to depression and irritability. Increased body hair and thinning of scalp hair. Impaired thyroid function, including Grave's disease. Impaired blood sugar control. The astounding acceleration of puberty in young girls from an average age of 14 to 15, to now as young as 9 or And, finally, xenoestrogens have been strongly implicated in declining male sperm production and the increase in the rates of testicular cancer and prostate cancer.
Phytoestrogens work primarily by filling the body's estrogen receptor sites with weaker plant based estrogens so that those sites are no longer available to far stronger natural, synthetic, or even petroleum based estrogens. Too much of any food or supplement is bad. If you over indulge in something, no matter how beneficial it is, it will result in illness, not health. Pure water is important. But if you overindulge, it can lead to " water intoxication " and even death.
And fiber is crucial for intestinal health, but consume too much and it can lead to malabsorption of vitamins and minerals and, in some cases, even intestinal blockage. And the same rule applies to phytoestrogens. So how does that relate to soy? Soy is packed with isoflavones. In fact, many of the benefits of soy consumption are attributed to its high isoflavone content. Isoflavones are polyphenolic compounds that are capable of exerting estrogen-like effects and are thus classified as phytoestrogens plant-based compounds with estrogenic activity.
Soy contains the highest concentration of phytoestrogens of any regularly consumed dietary source known. Soy milk is the perfect option. For those who do not like the taste of unflavored soy milk, flavored varieties are available including chocolate and vanilla varieties.
Typically, fewer chemicals are present in soy products than in many other products. In addition to having a highly nutritious content, highlights of the benefits of soy milk include: The low sodium content of soy milk is beneficial for those with high blood pressure since they need to maintain a low sodium intake.
Fiber is derived from plant-based foods and is important for preventing gastrointestinal diseases and constipation. The intake of products with saturated fat increases the blood cholesterol, which is associated with an increase in the incidence of heart disease. What Are the Disadvantages of Soy Milk? Unfortunately, drinking soy milk is often an acquired taste. It can take several different brands and several different types of soy milk to locate one that you like the taste of well enough to drink on a regular basis.
Additionally, soy milk does not supply an ample source of calcium. Calcium-fortified soy milk can have up to three times the amount of calcium compared to a soy milk product that has not been fortified with calcium. Soy milk is sometimes thickened with a derivative of seaweed.
This seaweed additive is thought to create digestive problems in some individuals. Further testing needs to take place before any definitive results or statements can be made. Negative side effects can result from drinking too much soy milk. In particular, stomach problems such as gas pains can result. Soy products are though to be the root cause of some thyroid disorders, reproductive system problems and allergy related symptoms, especially in individuals who have been using soy products since an early age.
No matter what the reason you have for drinking soy milk, it is important to start out slowly as with any change in your diet.
Soy and Health Update: Evaluation of the Clinical and Epidemiologic Literature
The literature is replete with clinical examples of differences between these two molecules. For this reason they are able to exert estrogen-like effects under certain experimental conditions and so are referred to as phytoestrogens.
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