研究人员通过先进的¹³C同位素追踪技术发现， PLA微塑料一旦进入肠道，其碳骨架就能被肠道细胞吸收并用于合成氨基酸和核酸等生命必需物质。 看似是一种“废物再利用”的过程，实则暗藏风险。

这项研究首次阐明了聚乳酸微塑料（PLA-MP）在肠道内的完整碳循环过程，揭示其对人体代谢的潜在负面影响，为评估可降解塑料的安全性提供科学依据。也提醒我们：环保不能止步于“可降解”标签，真正的绿色未来需要更智慧的科技与更审慎的选择。

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