Antioxidants in fruits and flowers seem to counteract harmful effects of microplastics, study shows | Plastics

Antioxidants that give fruits and flowers their vibrant colors seem to counteract some of the most dangerous reproductive-system effects of exposure to microplastics, such as decreased fertility, and could ultimately be used in developing treatments, new peer-reviewed research shows.

The paper focuses on microplastics’ reproductive toxicity and plant compounds called anthocyanins, which are widely found in nuts, fruits and vegetables. The new review of scientific literature on anthocyanins finds that the compounds are probably protective against a range of plastic-induced effects on hormones, reductions in testosterone and estrogen, decreased sperm counts, lower sperm quality, erectile dysfunction and ovarian damage.

“The search for natural compounds to counteract these harmful effects is ongoing, with anthocyanins emerging as a promising candidate,” write the study’s authors, who are with the Finland-China Food and Health Network.

“[Anthocyanins] have demonstrated potential protective effects against reproductive toxicity induced by microplastics.”

Microplastics are tiny bits of plastic either intentionally added to consumer goods, or that are products of larger plastics breaking down. The particles contain any number of 16,000 plastic chemicals, of which thousands, such as BPA, phthalates and Pfas, present serious health risks.

The substance has been found throughout the human body, and is a neurotoxicant that can cross the placental and brain barriers. It is linked to an increased risk of heart attack and cancer, in part because it appears to lodge in tissue or alter gut biome, which can increase inflammation throughout the body. Recent research links inflammation to congestive heart failure, and the antioxidants could, in theory, mitigate issues in other systems, as well.

In the male reproductive system, microplastics have been found throughout the testicles and semen. In women, they have been found in ovarian tissue, placentas, breast milk and fetuses.

In males, many of the problems stem from microplastics’ ability to cross the blood-testis barrier, which can cause inflammation in tissue. Some anthocyanins have been shown to improve sperm count, testes weight and spermatogenesis – a critical step in sperm development – by protecting the integrity of the blood-testis barrier, which prevents microplastics from getting in tissue.

Researchers say that mice exposed to a substance that causes the same diseases as microplastics, then treated with anthocyanins, showed increased sperm quality, including increased sperm count and motility, and that the antioxidants overall reduced testicular damage.

The new paper also points to research that suggests microplastics can reduce testosterone levels. Anthocyanins may help restore testosterone production by protecting Leydig cells, which are responsible for the hormone’s production, the paper states.

In women, impacts on fertility and sexual development could be mitigated by anthocyanins that seem to protect hormone receptors from plastic chemicals such as bisphenol, phthalates and cadmium. The chemicals can mimic hormones, or cause hormonal responses.

Microplastics in ovarian tissue cause inflammation that seems to lower levels of estrogen and other hormones. Research found that treating rats with health issues that can be caused by exposure to microplastics protected the ovarian tissue and normalized levels of estrogen and other hormones.

“Its antioxidant properties help preserve ovarian function and potentially maintain fertility, highlighting its therapeutic potential in managing ovarian damage,” the authors write.