36氪精选：你的大脑里，藏着一个塑料勺？

Core Viewpoint - The article discusses a shocking discovery that microplastics and nanoplastics have been found in human brain tissue, raising concerns about their potential impact on health, particularly in relation to neurodegenerative diseases [5][7][9]. Group 1: Research Findings - A study published in Nature Medicine revealed that all tested human brain samples contained microplastics and nanoplastics, with the highest concentration reaching 7 grams, equivalent to the weight of a plastic spoon [5][6]. - The concentration of microplastics in the brains of individuals with Alzheimer's disease and vascular dementia was found to be 3 to 5 times higher than in healthy individuals, suggesting a possible link between plastic exposure and cognitive decline [7]. - Between 2016 and 2024, the concentration of microplastics in brain tissue increased by 50%, paralleling the trend of plastic production doubling every 10 to 15 years [9]. Group 2: Sources of Microplastics - Microplastics enter the human body primarily through food and drink, as they have infiltrated the marine food chain, affecting seafood and salt consumption [10][11]. - Airborne microplastics, including synthetic fibers and particles from tire wear, also contribute to human exposure, with urban residents potentially inhaling up to 74,000 microplastic particles annually [13]. Group 3: Implications and Recommendations - The pervasive presence of microplastics in daily life necessitates a reduction in unnecessary plastic exposure, such as minimizing the use of single-use takeaway containers and opting for glass or stainless steel products [14]. - The article emphasizes that the concern has shifted from plastic pollution in oceans to its infiltration into human bodies, highlighting the urgent need for awareness and action [15].