Do not eat Peanut Butter, even the natural kind; it contains a mould that has phyto-estrogens in it.
These are the phytoestrogens in peant butter
Daidzein
Properties: Daidzein has both weak estrogenic and weak anti-estrogenic effects. Daizein has also antioxidant activity. Foti P. et al of the Department of Food Science and Microbiology (University of Milan) compared the antioxidant activity daidzein and genistein. antioxidant activity in primary and cancer lymphocytes. Their results showed that daidzein is just as effective as genistein in protecting cells against oxidative damage of DNA. The antioxidant activity of daidzein was measured at concentration which could be obtained by consumption of soy products.
The anti-estrogenic effect of daidzein may explain its anti-carcinogenic, anti-atherogenic and anti-osteoporotic activity. Epidemiological studies have long shown that people who consume a lot of soy have reduces incidences of prostate cancers. This benefit of soy could be explained by the anti-cancer and antioxidant activity of daidzein.
Constantinou AI et al (Department of Surgical Oncology, University of Illinois at Chicago) studied the effect of daidzein on the capacity of tomaxifen to prevent mammary tumours. They concluded that the combination of daidzein and tamoxifen produces increased protection against mammary carcinogenesis: tumour multiplicity was reduced by 76 percent and tumor incidence by 35 percent.
Daidzein seems to reduce the risk for osteoporosis. Studies have shown that daidzein stimulates the formation of osteoblasts, which are cells that produce bone mass.
There are also indications that daidzein may reduce the dependence on alcohol. Keung WM et al of the Center for Biochemical and Biophysical Sciences and Medicine, Harvard Medical School, Boston, showed that an extract of Radix Puerariae suppressed the free-choice ethanol intake of ethanol-preferring hamsters. The herb Radix Puerariae contains daidzein and is used in China as a traditional Chinese medicine for alcohol addiction and intoxication.
Genistein
Properties: Genistein works on several fronts: it acts as a phytoestrogens and as an antioxidant.
The estrogenic activity of genistein has been confirmed in many studies. Of all the isoflavones, genistein has the strongest estrogenic activity.
Genistein is a strong antioxidant. Genistein removed damaging free radicals and reduces lipid peroxidation. Only oxidized LDL cholesterol is absorbed by the arterial cells. Prevention of the oxidation of LDL cholesterol will reduce the risk for arteriosclerosis. Gensistein prevents the formation of hearth attacks and strokes by acting as anticlotting agent. Genistein increases the activity of other antioxidant enzymes such as glutathione peroxidase, superoxide dismutase and glutathione reductase. Studies have shown that genistein can also influence the growth of cells which are not hormone-dependent. Genistein seems to inhibit the activity of tyrosine kinase, which plays an important role in cell growth. Reduction of tyrosine activity will result in a reduced cancer risk.
Genistein seems to reduce the risk for some hormone related cancers, principally breast cancer and prostate cancer. Epidemiological studies show that consumption of isoflavones may protect against breast and prostate cancer. High dietary intake of soy products China and Japan are linked with low incidence of these cancers. There are lots of theories to explain the anti-cancer action of genistein: inhibition of angiogenesis, inhibition of tyrosine kinases, antioxidant property, and anti-estrogen action (it is known that estrogen increases risk for certain cancers). Genistein binds with estrogen receptors, preventing the estrogen from binding and initiating cancer growth.
The estrogenic effect of genistein may also explain its protective action against osteoporosis.
Genistein is also used to ease menopause symptoms, such as hot flushes.
Biochanin A
Biochanin A belongs to the isoflavone class of flavonoids. It is also classified as a phytoestrogen since it is a plant-derived nonsteroidal compound that possesses estrogen-like biological activity. Biochanin A has been found to have weak estrogenic activity.
Biochanin A has estrogenic activity. It may also have antioxidant, anticarcinogenic, anti-atherogenic and anti-osteoporotic activities
Biochanin A has weak estrogenic activity as measured in in vivo and in vitro assays.
Structurally, biochanin A would be expected to be able to scavenge reactive oxygen species and inhibit lipid peroxidation. However, there are few studies demonstrating this.
There are cell culture and animal studies indicating that biochanin A has anticarcinogenic activity. It is unclear what the mechanism of the possible anticarcinogenic activity might be.
Biochanin A has been found to have hypolipidemic activity in some animal models. Again the mechanism of this possible effect, as well as the mechanism of any anti-atherogenic activity, is unclear.
In comparison with other isoflavones, such as genistein and daidzein, biochanin A might be expected to have possible anti-osteoporotic activity. This might be due, in part, to its weak estrogenic activity.
Little is known about the pharmacokinetics of biochanin A in humans. Inferences can be drawn from some animal studies. Biochanin A appears to be absorbed from the small intestine from whence it is transported to the systemic circulation by the lymphatics. There is little information available on the tissue distribution of biochanin A. It appears that biochanin A delivered to the liver undergoes extensive conjugation with glucuronate and sulfate via hepatic UDP-glucuronosyltransferases and sulfotransferases. The glucuronate and sulfate conjugates of biochanin A are excreted in the urine and the bile.
Secoiso-lariciresinol
Secoisolariciresinol diglycoside (SDG) (C32H46O16) is an anti-oxidant phytochemical present in flax, sunflower, sesame, and pumpkin seeds. It is a precursor of mammal lignans and a phytoestrogen.
Animal studies have shown SDG can prevent the development of atherosclerosis and diabetes, and has beneficial modifying effect on blood and cholesterol levels.
Secoisolariciresinol diglucoside can be isolated from de-fatted (hexane extraction) flaxseed by extraction of the lignan polymer precursor with a water/acetone mixture, followed by acetone removal and alkaline hydrolysis.[1]