Soy Infant Formula-- Birth Control Pills for Babies

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Phytoestrogens in Diets of Infants and Adults

Children receiving soy formula as their only food take in over 10 time the

levels of isoflavones on a body weight basis than the amount shown to

cause thryoid suppression in adults after three months and about eight times

the levels of isoflavones on a bodyweight basis as the amount shown to cause

hormonal changes in adults after just one month.

 

Average

Isoflavones

Intake

Isoflavone

per Kg of

body weight* China (1990 survey)1

3 mg

0.05 mg Japan (1996 survey)2 10 mg 0.17 mg Japan (1998 survey)3 25 mg

0.42 mg Japan (2000 survey)4 28 mg 0.47 mg In Japanese subjects receiving

adequate iodine

causing thyroid suppression after 3 months5 35 mg 0.58 mg In American

women, causing hormonal changes

after 1 month6 45 mg 0.75 mg FDA recommended amount for adults7 24 mg

0.40 mg In children receiving soy formula8 38 mg 6.25 mg

* Assumed 60 kg for adults, 6 kg for infants

It is clear that the isoflavones in soy infant formula are well absorbed

by the infant. Babies on soy formula were found to have levels of serum

estrogens at 13,000 -22,000 times greater than those in infants who had been

breast fed or given milk-based formula.9

According to a Swiss report, 100 mg isoflavones taken by adult women

provide the estrogenic equivalent of a contraceptive pill.10 This means that 10

mg provides the estrogenic equivalent of a contraceptive pill to a baby of 6

kg. Thus, the average amount taken in by a child on soy-based formula

provides the estrogenic equivalent of at least 4 birth control pills. Because

babies are more vulnerable than adults to the effects of dietary estrogens,

the effects could actually be much greater than that of 4 birth control

pills. Hence the statement, " Babies on soy formula receive the estrogenic

equivalent of at least 5 birth control pills per day. "

REFERENCES

1. An exhaustive study of Chinese diets found that legume consumption

ranged from 0 to 58 grams per day, with an average of 13 gams. According

to the researchers, about two-thirds of this was supplied by soy beans,

giving average consumption of about 9 grams of soy products per day. Chen J,

Campbell TC, Li J, Peto R. Diet, Lifestyle and Mortality in China. A study of

the characteristics of 65 counties. Monograph, joint publication of Oxford

University Press, Cornell University Press, China People's Medical

Publishing House, 1990. Isoflavone content is estimated be about 3 mg per day

based on an average amount of 30 mg total isoflavones per 100 grams of tofu.

USDA-Iowa State University Database on the Isoflavone Content of Foods 1999.

2. Fukutake M and others. Quantification of genistein and genistin in

soybeans and soybean products. Food Chem Toxicol 1996;34:457-461.

3. Nagata C and others. Decreased serum total cholesterol

concentration is associated with high intake of soy products in Japanese men

and

women. J Nutr 1998 Feb;128(2):209-13.

4. Nakamura Y and others. Determination of the levels of

isoflavonoids in soybeans and soy-derived foods and estimation of isoflavonoids

in the

Japanese daily intake. J AOAC Int 2000;83:635-650.

5. Y Ishizuki and others. The effects on the thyroid gland of

soybeans administered experimentally in healthy subjects. Nippon Naibunpi

Gakkai

Zasshi 1991, 767: 622-629. Thirty grams of soybeans per day were

administered to the test subjects. Raw Japanese soybeans contain 119 mg total

isoflavones per 100 grams, giving a rough total of 35 mg isoflavones per day.

6. Cassidy A, Bingham S, Setchell KD. Biological effects of a diet of

soy protein rich in isoflavones on the menstrual cycle of premenopausal

women. Am J Clin Nutr 1994;60(3):333-340.

7. The FDA recommended amount for adults is 25 grams of soy protein

isolate per day. This provides about 24 mg isoflavones per day based on a

total isoflavone content of 97 mg for 100 grams of soy protein isolate.

USDA-Iowa State University Database on the Isoflavone Content of Foods 1999.

8. Setchell KD and others. Isoflavone content of infant formulas and

the metabolic fate of these early phytoestrogens in early life. Am J Clin

Nutr 1998 Dec;68(6 Suppl):1453S-1461S.

9. Ibid.

10. Bulletin de L'Office Federal de la Santé Publique, No 28, July 20,

1992