你的大脑里，藏着一个塑料勺？

Core Viewpoint - A recent study published in Nature Medicine reveals the presence of microplastics and nanoplastics in human brain tissue, raising concerns about their potential impact on neurological health [2][4]. Group 1: Research Findings - All tested human brain samples contained microplastics, with the highest concentration reaching 7 grams, equivalent to the weight of a plastic spoon [3]. - Individuals with Alzheimer's disease and vascular dementia exhibited 3 to 5 times higher concentrations of microplastics in their brains compared to healthy individuals [4][6]. - Over the past eight years, the concentration of microplastics in the brain has increased by 50%, paralleling the trend of plastic production doubling every 10 to 15 years [7]. Group 2: Sources of Microplastics - Microplastics enter the human body primarily through food and drink, with seafood, salt, and bottled water being significant sources [9][12]. - Airborne microplastics, including synthetic fibers and tire wear particles, also contribute to human exposure, with urban residents potentially inhaling up to 74,000 microplastic particles annually [13][14]. Group 3: Implications and Recommendations - The pervasive presence of microplastics suggests that complete avoidance is impossible, but reducing unnecessary plastic exposure is advisable, such as minimizing takeout and opting for glass or stainless steel containers [17]. - The shift in concern from ocean plastic pollution to human health implications underscores the urgency of addressing plastic contamination [18].