Researchers from Tel Aviv University and Sheba Medical Center in nearby Petah Tikva have hypothesized that the ultraviolet (UV) radiation from the sun can have a positive impact on fertility in women in late reproductive age.
The theory stems from the discovery that women aged between 30 and 40 during the summer produce more of the anti-Müllerian hormone (AMH), which is linked to ovarian function.
The researchers examined the AMH levels in 2,235 women after UV exposure, and found that those in the 20-29 age bracket had unchanged levels, while the older age bracket saw a statistically significant rise in the hormone.
The study was jointly led by Prof. Carmit Levy of the university’s Department of Human Genetics and Biochemistry and Dr. Ruth Percik from the Institute of Endocrinology at Sheba, which is the largest hospital in both Israel and the entire Middle East.
“Based on our prior studies, we can affirm that sun exposure increases metabolism, sexual appetite and behavior, and, at least in animal models, enlarges the ovaries and extends the estrus period,” said Levy.
“This is a preliminary, pioneering human epidemiological study, and we need to be cautious about inferring a causal relationship between fertility in women and exposure to UV radiation. Humans are not the same as mice. However, we are also animals, our hairless nature makes us even more sensitive to solar radiation. Our research suggests that the female reproductive system is indeed more fertile in the summer, but we still have no information on the mechanism or actual success rates.”
The findings were recently published in the Steroids journal.
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