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Soy and fertility

  1. Soy contains vegetable hormones (phytoestrogens) which are very similar to the female estrogenic hormones. Because of these hormones, soy products have a positive effect on menopausal complaints and premenstrual complaints. However, if you have a desire to have children, it may be wise to leave soy products because of these hormones.

Infertility in rats

  1. Twenty years ago, female rats in a laboratory with a genetic abnormality in the liver enzyme glucuronosyl transferase were found to be infertile. This was after a change in the diet of the animals occurred. Previously, the rats got protein from animal sources, now they got protein from soy products. The genetic abnormality of the animals means that toxins and waste products in the blood are poorly removed, so that they remain in the body for longer. The phytoestrogens from soy therefore remain in the body longer. Phytoestrogens disrupt the menstrual cycle, resulting in infertility. The infertility turned out to be temporary. After the animals were returned to the old diet, the fertility problems were resolved.

Female fertility

  1. People with exactly the same genetic abnormality as the above rats have the rare Crigler-Najjar syndrome. There are a few hundred people who have this syndrome, so the chance that you will have this is small. However, about 10% of the population has (often without knowing it) Gilbert's Syndrome. This also involves a genetic abnormality in the liver enzyme glucuronosyl transferase, but less pronounced. Unwanted substances in the blood are therefore removed, but less quickly than in people without abnormalities. The consumption of soy by women with the above syndromes has not yet been proven to actually cause infertility or reduced fertility. Given the fact that rats and humans often give the same reaction, chances are high. By avoiding soy if you want to have children, the risk can in any case be ruled out. This of course also applies to women who do not have a syndrome, consumption of soy may also have an influence on the hormones.

Male fertility

  1. The male rats in the laboratory continued to be fertile, yet phytoestrogens in soy can disrupt the male hormone balance considerably. Research in 99 men showed that the intake of fifteen soy meals over a period of three months reduced the number of sperm by half. This does not have to be a problem for normally fertile men, as millions of sperm cells remain. However, when you're dealing with reduced fertility, every cell counts.


  1. Do you want to have children and do you want to get pregnant as soon as possible? Then leave soy products. In any case, if you want to have children, do not use supplements that contain high concentrations of phytoestrogens.

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