Myten: Soya er farligt

Ja, den har jeg godt nok hørt mange gange. “Pas på med soya!”, “Soya er farligt!!”. Derfor vil jeg gerne tage emnet op ved at gøre brug af artiklen “A Vegan Doctor Addresses Soy Myths and Misinformation“, skrevet af læge Holly Wilson M.D. d. 14. Januar.2014

Myte # 1: “Alt soya er GMO!”
De største forbrugere af GMO dyrket soya er landmænd. De bruger det til landbrugsdyrene. Der er mange lande som forbyder genmodificerede fødevarer, så der er helt klart tale om en fare der! Og det er helt rigtigt at soyabønner er en af de fødevarer som domineres af GMO, men ALT soya er ikke GMO! Lige pt. er 81 % af den globale dyrkning af soya genetisk modificeret. Men det interessante er, at ca. 85 % af alle genmodificerede soya bønner anvendes som dyrefoder i landbruget (Wilson, 2014). Og GMO forsvinder ikke bare, i selve slagteprocessen eller malkeprocessen – så det er faktisk dér genmodiferede soyabønner i allerhøjeste grad havner på folks tallerkener. Så 85 % af al genmodificeret soya, ryger i mennesket inddirekte gennem animalske fødevarer, mens de soya produkter som indtages direkte af mennesket i fleste tilfælde er GMO frit. Du kan altså sagtens finde soyamælk, tempeh, tofu osv. som absolut ikke er blevet genmodificeret (Wilson, 2014).

non-GMO tofu image, soy myths

Bilag 1: Et eksempel på et helt ufarligt økologisk og GMO frit soyaprodukt

 

Myte # 2: “Soya er kræftfremkaldende!”
Denne fejlinformation er opstået pga. forvirring over phytoøstrogen. Phytoøstrogen er ikke det samme som østrogen (Wilson, 2014).

“Estrogen and testosterone are steroid hormones, and occur naturally in both sexes of humans, as well as in animals used for food. They help regulate sexual function and secondary sexual characteristics, in addition to nonsexual cellular functions. While estrogen plays many important beneficial roles in humans, it also naturally promotes proliferation of cells, and, at high levels, can increase risk of some cancers by encouraging cells to multiply more than they usually would. Hormone replacement therapy in postmenopausal women (specifically, taking only estrogen) has also been implicated in cancer growth. (2).” (Wilson, 2014).

Men hvad så med alle dem som spiser kød? Er det i virkeligheden der vi skal være bekymrede? Ifølge Wilson indeholder soya ikke østrogen, men det gør animalske fødevarer derimod:

“While soy does not contain estrogen, animal foods do. Many consumers are aware that animals used for meat and dairy are commonly supplemented with synthetic growth hormones, but what they don’t consider is that animal flesh and cow milk also contain their own naturally occurring estrogen— and this is true even of “grass-fed” and “organic” animals. Furthermore, meat, dairy and eggs all contain phytoestrogens; they are pervasive in our food, both plant and animal-derived, and you are not avoiding them entirely by avoiding soy” (Wilson, 2014).

Wilson tilføjer endda at man ikke undgår phytoøstrogen ved blot at undgå soya. Dette er interessant i forhold til de myter der er omkring hvor farligt soya skulle være. Hvis det samme som de hævder er farligt i soya, også eksisterer i de varer som de selv er interesserede i at sælge, kan man undre sig over hvorfor de ikke også nævner at phytoøstrogen også er at finde i deres egne produkter og helt 100 % østrogen. Det understøtter blot, at interessen ligger i at stoppe soyaindustrien i at overhale den animalske ved at gøre folk bange.


Men phytoøstrogen imiterer jo østrogen og er derfor farlige, eller?

Phytoøstrogen er blot et opfang udtryk for mange naturligt forekommende plante forbindelser, der strukturelt ligner pattedyr østrogen og funktionelt er svagt østrogene (svagt efterligne østrogen) eller antiøstrogene (blokering østrogens effekter). Stofskiftet og funktionalitet planteøstrogener er utroligt komplekst, og varierer fra individ til individ. Den bekymring der er omkring soja og kræft skyldes det faktum, at soja-baserede fødevarer indeholder phytoøstrogener (specifikt isoflavoner) i varierende mængder (afhængig af præparatet), og disse reagerer med østrogenreceptoren. Der er to typer af østrogenreceptorer i mennesker: alfa og beta. Alfa er fordelt bredt i hele kroppen, mens beta er lokaliseret i æggestokken, prostata-, lunge-, og epididymis (testikel). Mens isoflavoner, som østrogen, binder til både alfa og beta-receptorer (fortrinsvis til beta), har isoflavoner ikke den østrogene virkning som inducere tumorvækst. Faktisk har isoflavoner påvist beskyttende fordele mod hormonafhængige kræftsygdomme (Wilson, 2014).

The inverse relationship between soy consumption and risk of developing premenopausal breast cancer has been clearly established. In other words, higher rates of soy intake are associated with lower rates of breast cancer. (3) However, large clinical trials have not yet been conducted regarding the effect of phytoestrogen consumption on tumor growth in established cancer patients. (4) To date, such studies have utilized small sample sizes, and the methods for obtaining data were highly variable. There have been ‘promising’ results from multiple animal models, demonstrating a reduction in tumor size with consumption of soy protein. Yet, aside from the immorality of artificially inducing cancer in unwilling participants, it is dangerous to compare laboratory animals to humans. We are not mice. Even within our species, there is tremendous variability in the metabolic processing of phytoestrogens and pharmacological agents, thus establishing the difficulty and complexity of this area of research. Instead, attention should be placed on the already available mass of epidemiological data which compares Asian cultures to those consuming a Western diet.” (Wilson, 2014)

Myte # 3 “Mænd får bryster af at spise soyaprodukter”

Denne myte er højst sandsynligt opstået pga. forvirringen omkring østrogen og phytoøstrogen, som tidligere gennemgået ikke er det samme (Wilson, 2014). Og som Wilson udtrykker det med humor:

“If indeed this were the case, there would be a lot of men in need of bras.” (Wilson, 2014)

Hun forsætter derefter med at forklare:

“In reality, clinical studies in men show that isoflavones do not affect testosterone levels or circulating estrogen levels. Even at levels of isoflavone exposure significantly higher than those of a typical Asian male consuming a soy rich diet, isoflavones have not been found to have feminizing effects. (6)” (Wilson, 2014)

Det gode ved soya

“Soy has long been recognized as a nutrient-dense food and as an excellent source of protein by respected dietitians and clinical nutritionists. (1) The soybean contains all of the essential amino acids, as well as an impressive list of micronutrients (vitamins and minerals). Micronutrients in rich supply in soy include: calcium, iron, magnesium, manganese, phosphorus, potassium, vitamins B1, B2, B3, B5, B6, B9, C and zinc. Fiber and omega-3 and 6 fatty acids are also present in soy. The composition of these nutrients varies among preparations, but is in the highest quantity in whole soy foods such as edamame (whole soy beans), soy milk, tofu and tempeh.” (Wilson, 2014).
“Hvorfor skulle nogen lyve?” Tænker dem som godtroende har taget “informationerne” til sig, omkring hvor usundt soya er. Kan i mon gætte svaret? Ja, penge, penge, penge. Hvis du tror sundhed adskiller sig fra andre former for forretningsaftaler, så tager du desværre fejl. Vores sundhedsoplysninger er desværre ren forretning for nogle.

Landmænd betaler for anti-soya kampagner for at øge eget salg
Price Foundation (WAPF) som hævder at være en nonprofit organisation, står bag anti-soya-kampagner. Hvorfor?

“Soy myths and hysteria and the Weston A. Price Foundation (WAPF) are inseparable. Much of the fear-mongering around soy is a direct result of misinformation disseminated by the WAPF’s relentless anti-soy campaigns. The WAPF, registered as a nonprofit organization, is a multimillion dollar operation that lobbies for raw milk and grass-fed beef. Its members (often farmers) make financial contributions and in turn benefit from WAPF promotion.” (Wilson, 2014).

Dvs. at dem som oplyser folk omkring hvor farligt soya er, samtidigt reklamerer  for mælke og kød-industrien som i øvrigt indeholder det samme de forsøger at advare imod. Som nævnt ovenfor, sidder WAPF med flere million dollars og en hel del medlemmer som finanser penge til organisationen for at få reklame, til fordel for egen industri, til gengæld. Her er det virkelig vigtigt at man som forbruger er i stand til at skelne mellem oprigtige videnskabelige undersøgelser og artikler skrevet for at promovere et salg, eller for at mindske et salg hos en konkurrent, som i det her tilfælde er soyaindustrien. Den er nemlig vokset en del gennem årene. I 1992 var salget på 500 dollars, som i 2011 var på hele 5.2 billioner dollars (Wilson, 2014). Det er klart at det er en trussel mod landbruget og at der aktivt forsøges at blive sat en stopper for det. Det er ren forretning folkens! Lad os prøve at være bedre til at gennemskue den slags ”informationer” – for de gavner os ikke.

Her er et eksempel på hvordan nogle resultater fra en videnskabelig undersøgelse bliver drejet til fordel for anti-soya-kampagnerne:
To give one example, there is a recent blog entry on the WAPF website from board member Kaayla Daniel, who attempted to interpret an article from the Journal of American Medical Association (JAMA) in a way that would promote the WAPF’s anti-soy agenda. On July 10 2013, JAMA published ‘Effect of Soy Protein Isolate Supplementation on Biochemical Recurrence of Prostate Cancer After Radical Prostatectomy’. (5) The study was well conducted (randomized and double-blind), and aimed to analyze whether or not soy intake would have any effect on patients being treated for advanced prostate cancer. Oncologists measured PSA (prostate specific antigen) in the blood at specific time intervals to assess response. It is not surprising that in patients with a lifetime consumption of foods high in animal fat and protein, pesticides, preservatives and antibiotics, and after a diagnosis of advanced cancer — that the biochemical markers were not affected by soy ingestion. The study could yield no solid conclusions about soy, except that with advanced prostate cancer, the consumption of soy will not reduce biochemical markers. Yet, the WAPF skewed data and selectively interpreted the study to support claims that further their anti-soy agenda.” (Wilson, 2014)

It’s also worth noting: Dr. Weston A Price (1870-1948) was a dentist, not a physician or a dietician. He studied teeth from primitive cultures and formulated dietary recommendations for modern society based on dental decay observations.” (Wilson, 2014)

Wilsons kildereferencer:

(1) Tucker, Katherine L. et al. “Simulation with Soy Replacement Showed That Increased Soy Intake Could Contribute to Improved Nutrient Intake Profiles in the U.S. Population.” The Journal of Nutrition, doi: 10.3945/jn.110.123901; 27 October 2010

(2) Morito, Keiko. et al. “Interaction of Phytoestrogens with Estrogen Receptors Alpha and Beta.” Biological and Pharmaceutical Bulletin, Vol. 24, Issue 4, pp. 351-356, April 2001

(3) Lee, Sang-Ah. et al. “Adolescent and Adult Soy Intake and Breast Cancer Risk: Results from the Shanghai Women’s Health Study.” The American Journal of Clinical Nutrition, Vol 89, Issue 6, pp. 1920-1926, June 2009

(4) Wu, A H. et al. “Epidemiology of Soy Exposures and Breast Cancer Risk.” British Journal of Cancer, Vol 98, Issue 1, pp. 9-14, 15 January 2008

(5) Bosland, Maarten C. et al. “Effect of Soy Protein Isolate Supplementation on Biochemical Recurrence of Prostate Cancer After Radical Prostatectomy: A Randomized Trial.” The Journal of the American Medical Association, Vol. 310, Issue 2, pp. 170-178, 10 July, 2013

(6) Messina, Mark. “Soybean isoflavone exposure does not have feminizing effects on men: a critical examination of the clinical evidence.” Fertility and Sterility, Vol. 93, Issue 7 , pp. 2095-2104, 1 May 2010

(7) Chang, Hebron C. et al. “Dietary Genistein Inactivates Rat Thyroid Peroxidase in Vivo without an Apparent Hypothyroid Effect.” Toxicology and Applied Pharmacology, Vol 198, Issue 3, pp. 244-252, 1 November 2000

– See more at: http://freefromharm.org/health-nutrition/vegan-doctor-addresses-soy-myths-and-misinformation/#sthash.XrOxRXN4.DKemmV7Z.dpuf

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