Hormonal health
Half of countries lack endometriosis care policies

Nearly half of countries lack national policies or clinical guidance for endometriosis care, a new global review has revealed.
Endometriosis affects about one in ten women and girls worldwide. Across 194 WHO member states, researchers found striking disparities in care.
More than a quarter of countries have no publicly available clinical recommendations, and only 7 per cent have government-endorsed care guidelines.
In many places, the only guidance comes from informal sources such as advocacy sites or social media, leading to inconsistent care.
Europe had the widest guideline availability, while many low- and middle-income countries had little or none.
Devon Evans, assistant professor at the University of Manitoba, said: “Our findings show that many people living with this chronic condition are navigating care in regions where no official recommendations exist.”
A companion analysis reported that half of all countries had no policy information available.
Ninety-six countries recognised endometriosis as a national problem, 48 put it on the political agenda, and 12 adopted policies for a national strategy.
Notable examples include national action plans in Australia and France that are being implemented and evaluated.
Tatjana Gibbons if from the University of Oxford’s Nuffield Department of Women’s & Reproductive Health.
Gibbons: “Despite increasing awareness of endometriosis, addressing the challenges faced by those living with the condition requires coordinated national strategies developed in collaboration with policymakers, advocates and patients themselves, to reduce its global burden.”
The authors called for governments, medical societies and patient groups to collaborate on clear, region-specific care standards to cut diagnostic delays, improve quality of life and ensure equitable access to treatment.
An accompanying editorial urged a shift “from awareness to action”, with WHO noting the condition’s physical, mental and socioeconomic impact and the need to demonstrate that policies and guidelines translate into real-world improvements.
Fertility
Toxins and climate harms having ‘alarming’ effect on fertility, research warns

Simultaneous exposure to toxic chemicals and climate-related heat may be worsening fertility harms across humans and wildlife, research suggests.
The review of scientific literature looks at how endocrine-disrupting chemicals, often found in plastic, together with climate-related effects such as heat stress, are each linked to lower fertility and fecundity, meaning the ability to reproduce, across species including humans, wildlife and invertebrates.
Though the reproductive harms of each issue in isolation are well studied, there is little research on what happens when living organisms are exposed to both.
“Together, the two issues are likely to pose a greater threat to fertility, and the additive effect is “alarming”, said Susanne Brander, a study lead author and courtesy faculty at Oregon State University.
“You’re not just getting exposed to one, but two, stressors at the same time that both may affect your fertility, and in turn the overall impact is going to be a bit worse,” Brander said.
The paper looked at 177 studies.
Shanna Swan, a co-author on the new paper, co-produced a 2017 study that found sperm levels among men in western countries had fallen by more than 50 per cent over four decades. Other research has suggested human fertility has been declining at a similar rate.
The University of Washington’s Institute for Health Metrics and Evaluation has previously said the world was approaching a “low-fertility future”, with more than three quarters of countries below replacement rate by 2050.
The new paper’s authors focused on the effects of endocrine-disrupting chemicals and substances, including microplastics, bisphenol, phthalates and PFAS.
These are thought to cause a range of serious reproductive problems, disrupt hormones and be a potential driver of falling fertility.
Brander said the harms linked to these chemicals are often similar across organisms, from invertebrates to humans.
Phthalates, for example, have been linked to altered sperm shape in invertebrates, spermatogenesis in rodents, meaning sperm production, and reduced sperm counts in humans.
PFAS are also thought to affect sperm quality, and both have been linked to hormone disruption.
The chemicals are widespread in consumer goods, so people are often regularly exposed.
Meanwhile, previous research has shown how rising temperatures, lower oxygen levels and heat stress, among other effects linked to climate change, may also worsen infertility.
Heat stress has been found to affect human hormones, and is linked to spermatogenesis in rodents and bulls.
Research shows temperature also plays a role in sex determination in fish, reptiles and amphibians.
The species has evolved to choose which sex it produces in part based on temperature, and the heating planet can “push it too far in one direction or the other, which overrides that evolutionary benefit”, Brander said.
Similarly, many endocrine disruptors may alter environmental sex determination.
The study set out some of the overlapping effects of chemical exposure and climate change across taxonomic groups, from invertebrates to humans.
In birds, for example, exposure to increased temperature, PFAS, organochlorines and pyrethroids may each individually cause abnormal sperm, increased fledgling mortality, abnormal testes and population decline.
“What happens if they’re exposed to more than one of those stressors at the same time? There has been little exploration of that question.
“Even if there have not been a lot of studies looking at these simultaneously, if you have two different factors that both cause the same adverse effect, then there’s a likelihood that they are going to be additive,” Brander said.
Katie Pelch, a senior scientist with the Natural Resources Defense Council nonprofit, who was not part of the study, said the authors had reviewed high-quality science.
She said she wanted to see more examples of the overlap in impacts, but agreed with the overall premise.
“It is likely [multiple stressors] would have an additive effect, at very least, even if they have different mechanisms of harm,” Pelch added.
The solution to the systemic problems would involve tackling climate change and reducing the use of toxic chemicals.
The study cites the global reduction in the use of DDT and PCBs achieved under the Stockholm Convention as an example of an effective measure, but Brander said much more is needed.
“There is enough evidence in both areas to act to reduce our impact on the planet,” she said.
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