最近の研究は、マイクロプラスチックの摂取に関する驚くべき主張、例えば毎週クレジットカード1枚分を摂取するというものに疑問を投げかけている。マイクロプラスチックは環境や人体組織に広く分布しているが、研究によると曝露レベルは懸念されたほど高くなく、健康影響も不明瞭である。専門家はより厳密なデータが出るまで慎重であるよう促している。
マイクロプラスチックは、微小なプラスチック粒子で、世界最高峰の山々、最深部の海洋溝、遠隔の極地地域、そして心臓、肝臓、腎臓、母乳、血液などの人間の臓器を含む多様な場所で検出されている。その遍在性は、20世紀初頭にベークライトで初めて導入されたプラスチックの耐久性に由来し、パッケージング、電子機器、医療機器を革新した一方で、1世紀以上にわたる環境への放出ももたらした。
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Researchers at NYU Langone Health reported detecting microplastics in prostate tumor tissue from a small group of men undergoing prostate removal surgery, with average concentrations about 2.5 times higher in tumor samples than in nearby noncancerous tissue. The team says the findings, scheduled for presentation Feb. 26, 2026, at the American Society of Clinical Oncology’s Genitourinary Cancers Symposium, add early evidence that microplastic exposure could be relevant to prostate cancer but do not establish cause and effect.
A new systematic review indicates that microplastics could trigger brain inflammation and damage through several biological pathways, potentially worsening neurodegenerative diseases like Alzheimer's and Parkinson's. Researchers from the University of Technology Sydney and Auburn University identified five mechanisms linking these tiny plastic particles to brain health risks. Adults ingest about 250 grams of microplastics annually from various everyday sources.
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A comprehensive study led by Ocean Conservancy's Dr. Erin Murphy has determined the lethal amounts of ocean plastic for seabirds, sea turtles, and marine mammals. Published in the Proceedings of the National Academy of Sciences, the research analyzed over 10,000 necropsies from 95 species worldwide. The findings highlight low thresholds for mortality and urge broad policy reforms to curb plastic pollution.
Gut bacteria that recycle oestrogens back into the bloodstream are far more abundant in people from industrialised societies than in hunter-gatherers and rural farmers, according to a new study. Researchers found up to seven times greater recycling capacity in urban populations. The findings raise questions about potential health impacts from elevated hormone levels.
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As of early 2026, twelve states have implemented statewide bans on single-use plastic bags, with additional restrictions on foam containers and hotel toiletries gaining traction. Extended producer responsibility laws now cover packaging waste in seven states, shifting costs from taxpayers to producers. However, preemption laws in several states limit local actions, and the U.S. lags behind the EU and parts of Asia in comprehensive plastic regulation.
The overall toxicity of pesticides applied worldwide has risen significantly from 2013 to 2019, affecting various groups of organisms despite a United Nations goal to reduce risks by 2030. Researchers developed a measure called applied toxicity to assess this burden across 201 countries. The trend highlights growing challenges from pesticide resistance and shifting chemical use.