明明没干体力活却精疲力竭？本期 Lena 和 Eli 将揭示长期压力如何通过大脑“总调度室”扰乱血糖与代谢，带你识别那些正在悄悄“腐蚀”心血管的生理信号，找回身体的掌控权。
大脑在处理心理压力和血糖代谢时用的是一套共享系统，当你感到压力巨大时，大脑会一边开启焦虑情绪，一边直接越过情绪去操控能量调度，让血糖快速上升。
长期压力对心脏与代谢健康的影响，特别是压力如何导致血糖波动、代谢变慢以及相关的生理机制。
这是因为大脑在处理心理压力和血糖代谢时使用一套“共享系统”。当你感到压力时，大脑会误以为你处于原始环境下的生存危机中，从而拉响警报，指挥身体将储存的能量转化为血糖输送到血液里，准备进行“战斗或逃跑”。在现代办公环境下，由于你并没有进行实际的体力消耗，这些激增的血糖无法被利用，不仅会导致血糖水平升高，还会让身体因长期处于这种高能耗的警觉状态而感到极度疲劳。
长期压力会导致压力激素“皮质醇”水平持续偏高，这会引发心脏的“内耗”。研究发现，高压人群的心脏会出现“心肌功效率”下降的现象，即心脏虽然在用力跳动，但很大一部分力量并没有有效泵出血液，而是变成了“无用功”。这种损害具有滞后性，即便压力源消失，心脏功能的退化可能还会持续。此外，压力激发的去甲肾上腺素会破坏血管内皮细胞，使其变得粗糙并产生炎症，最终导致血管硬化和斑块形成。
这与皮质醇对脂肪分布的重新分配有关。当皮质醇长期处于高水平时，它会倾向于将能量储存在内脏周围，导致腹部脂肪堆积。同时，压力会使身体的代谢机制变得保守，降低能量消耗效率，并可能导致肝脏不受控地生产葡萄糖。这种代谢紊乱不仅让人难以变瘦，还容易引发肥胖、糖尿病和脂肪肝等多种代谢疾病共存的局面。
科学家发现，长期压力会导致大脑杏仁核中的“星形胶质细胞”提前衰老，破坏了为神经元提供养分的“丝氨酸穿梭”机制。当前线神经元缺乏养分时，会向身体发出错误的指令，过度激活负责战斗的“交感神经”，并抑制负责休息和降糖的“副交感神经”。这种神经失衡会直接干扰胰腺的正常工作，导致血糖稳态失衡，从而埋下糖尿病的隐患。
首先，必须将压力管理视为与管理血压、血脂同等重要的健康任务。规律的有氧运动是有效的“清理手段”，能消耗掉因压力激增的血糖并降低皮质醇水平。其次，可以通过深度呼吸或冥想来激活被抑制的“副交感神经”，给心脏和胰腺喘息的机会。理解压力是一个实实在在的生理挑战，有助于我们从整体观的角度出发，通过调节情绪来同步修复受损的生理路径。
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