红光与长波长光对健康的益处：科学研究揭示了什么
摘要
伦敦大学学院神经科学教授 Glen Jeffery 博士解释了长波长光（红光、近红外光和红外光）如何穿透人体，并通过与线粒体周围的水分相互作用来改善健康——提升 ATP 生成效率，减少细胞死亡。他同时警告，现代 LED 照明及过量短波长（蓝光）暴露是一个严重且被严重低估的公共卫生威胁，其危害程度或可与历史上的石棉危害相提并论。
核心要点
- 长波长光（670–900nm）可穿透整个人体，包括穿透衣物、皮肤甚至颅骨——它在体内散射并影响全身各器官的线粒体
- 早晨进行 3 分钟红光照射（约 670nm），几乎所有受试者的色觉提升约 20%，效果持续约 5 天
- 餐前红光照射可使人体试验中的血糖峰值下降逾 20%，可能是因为红光刺激线粒体消耗更多葡萄糖
- **上午时段（约上午 11 点前）**是红光疗法的最佳时机，原因在于线粒体蛋白质活性存在昼夜节律性变化
- LED 灯和短波长光照射会实时损害线粒体功能——膜电位下降，线粒体反应性降低
- 长波长光的作用机制是降低线粒体周围水分的黏度，从而提高产生 ATP 的分子马达的转速
- 红光疗法在早期干预时效果最佳——一旦疾病明显进展，获益将大幅减弱
- 根据瑞典及东英吉利大学的大型研究，阳光暴露量越多的人，全因死亡率（尤其是心血管疾病和癌症）越低
- 即使只照射一小块皮肤，也能产生全身性线粒体效应，提示全身线粒体以协调一致的方式共同运作
- 红光通过将线粒体膜电位维持在触发细胞”吞噬信号”的阈值以上，从而减缓细胞死亡（凋亡）的速度
详细笔记
光谱及其对人体的影响
- 可见光的波长范围大致为 400–700 纳米（nm）
- 太阳光的波长从约 300nm（深紫外线）延伸至近 3,000nm（深红外线）
- 短波长光（紫外线、蓝光）：频率高，携带能量多；在亚紫外波段具有电离性；可被皮肤和晶状体阻挡；过度暴露会导致晒伤和白内障
- 长波长光（红光、近红外光、红外光）：频率低，无电离性，可深度穿透组织
- 紫外线被皮肤表面阻挡，引发炎症（晒伤），而非穿透体内；晶状体和角膜同样能阻挡紫外线，这也是长期过度暴露可能导致白内障的原因
长波长光如何改善线粒体功能
- 早期假设：线粒体直接吸收长波长光。这一假设已被证明不正确
- 修正后的机制：长波长光被线粒体周围的水分（纳米水）所吸收
- 水分吸收长波长光后，降低了水的黏度，从而提高 ATP 合酶分子马达的转速
- 次级下游效应：线粒体电子传递链蛋白质合成增加，为能量生产铺设更多”轨道”
- 观察到两种效应：
- 即时效应：ATP 生成加快
- 长期效应：线粒体蛋白质合成增加
光对人体的穿透能力
- 长波长光可穿透：
- 皮肤（只有少量百分比从另一侧穿出，其余被内部吸收）
- 普通衣物——甚至可穿透 6 层 T 恤；衣物颜色不影响穿透效果
- 颅骨（已通过实验证实；骨骼对其阻挡作用不明显）
- 手掌（骨骼不可见；静脉中的脱氧血液会吸收它，这正是成像中显示的部分）
- 它不能穿透橡胶或脱氧血液（后者对其吸收极强）
- 进入体内后，长波长光向各个方向散射，到达远处的组织
- 应用案例：伦敦大学学院一位生物医学工程师（Ioannis Tachtsidis）将红光/近红外光透过卒中新生儿的颅骨照射，以监测线粒体功能作为存活指标——已获伦理委员会批准
血糖调节
- 熊蜂预实验：禁食并进行葡萄糖负荷后，接受红光照射的蜂与接受蓝光照射的蜂相比，血糖升幅显著更低
- 人体研究：受试者隔夜禁食，摄入葡萄糖负荷后，在其**背部一小块区域（约 4×6 英寸）**照射红光
- 结果：血糖峰值下降逾 20%
- 同期耗氧量增加，与线粒体利用更多葡萄糖的机制一致
- 照射面积太小，无法解释局部效应——证实这是一种全身性线粒体反应
- 启示：全天持续暴露于蓝光偏移的 LED 灯光下，可能正在以有害的方式升高血糖
红光改善视力
- 视网膜的线粒体密度在人体所有组织中最高——其代谢率最高，老化最快
- 实验：受试者接受色觉阈值检测（视功能测试，采用 Tritan 和 Protan 轴，并加入视觉噪声）
- 670nm 红光照射 3 分钟后，除一名受试者外，所有人的阈值均有改善
- 平均改善幅度：约 20%
- 效果持续 5 天后复位——该结果已在果蝇、小鼠和人类中重复验证
- 该效应是一种二元开关，而非剂量-反应曲线——在合适波长下获得足够能量即可触发持续 5 天的变化
- 波长指导：
- 670nm 及以上效果良好
- 低于 650nm 效果趋于减弱
- 近红外范围（约 700–900nm）同样有效
- 能量水平：最初在 40 mW/cm²（极亮）下测试；实验室现使用约 8 mW/cm² 可获得同等效果；某次实验在接近 1 mW/cm²（极暗）的条件下也取得了效果
- 睁眼与闭眼：差异不大——长波长光可有效穿透眼睑
- 年龄效应：40 岁以上人群改善更为显著，因为老化视网膜中的线粒体改善空间更大；年轻人同样可以响应
红光疗法的昼夜节律时机
- 早晨是最佳时间窗：从感知日出起至约 上午 11:00
- 线粒体蛋白质组成在 24 小时内发生显著变化
- 早晨，线粒体以最大效率生成 ATP；下午，线粒体转向执行其他细胞维护功能（“做家务”）
- 下午进行红光疗法效果明显较差
- 这一规律在果蝇、小鼠和人类中均保持一致
黄斑变性及疾病应用
- 针对黄斑变性的初期临床试验显示，患者本身未见获益——但作为对照组的配偶（无黄斑变性）却出现了显著的视力改善
- 事后分析：患者病情进展已过深，干预为时已晚
- 眼科医生 Ben Burton（英国）随后开展的一项研究，针对病情较早期的患者，显示了显著的积极效果
- 类风湿性关节炎试验中也发现了同样的局限性：关节已严重变形的受试者未见获益；干预需在结构损伤严重之前进行
- 红光通过将线粒体膜电位维持在触发分子”吞噬信号”的阈值以上，降低细胞凋亡（细胞死亡）的幅度
帕金森病与神经保护
- 研究人员 John Mitrofanis（澳大利亚）在灵长类动物中诱发帕金森病后，向其腹部照射红光——症状显著减轻
- 相关神经核团（黑质）深藏于大脑深部；机制被认为是全身性线粒体保护，减缓多巴胺能神经元死亡的速度
- 这与线粒体在全身相互沟通、作为一个整体社区协同运作的原理一致
LED 灯和短波长光的危害
- 现代 LED 灯的光谱严重偏向短波长（蓝光偏移）
- 将视网膜细胞（小鼠）暴露于 LED 灯光下，可实时观察到线粒体的变化
English Original 英文原文
Red Light & Long-Wavelength Light for Health: What the Science Shows
Summary
Dr. Glen Jeffery, professor of neuroscience at University College London, explains how long-wavelength light (red, near-infrared, and infrared) penetrates the body and improves health by interacting with water surrounding mitochondria, boosting ATP production and reducing cell death. He also warns that modern LED lighting and excessive short-wavelength (blue) light exposure represents a serious and underappreciated public health threat, potentially on par with historical hazards like asbestos.
Key Takeaways
- Long-wavelength light (670–900nm) penetrates the entire body, including through clothing, skin, and even the skull — it scatters internally and affects mitochondria throughout all organs
- 3 minutes of red light (~670nm) in the morning improved color vision by ~20% in nearly all subjects tested, with effects lasting approximately 5 days
- Red light exposure before a meal reduced blood glucose spikes by over 20% in human trials, likely by stimulating mitochondria to consume more glucose
- The morning window (before ~11am) is the optimal time for red light therapy due to circadian shifts in mitochondrial protein activity
- LED and short-wavelength light exposure degrades mitochondrial function in real time — membrane potentials drop and mitochondria become less responsive
- Long-wavelength light works by reducing the viscosity of water surrounding mitochondria, increasing the spin rate of ATP-producing molecular motors
- Red light therapy is most effective as an early intervention — once disease has significantly progressed, benefits are greatly diminished
- All-cause mortality (especially cardiovascular disease and cancer) is lower in people with greater sunlight exposure, according to large studies from Sweden and the University of East Anglia
- Even a small illuminated patch of skin produces systemic mitochondrial effects, suggesting mitochondria across the body act as a coordinated community
- Red light appears to reduce the pace of cell death (apoptosis) by keeping mitochondrial membrane potential above the threshold that triggers the cellular “eat me” signal
Detailed Notes
The Light Spectrum and How It Affects the Body
- Visible light spans roughly 400–700 nanometers (nm)
- Sunlight extends from ~300nm (deep UV) to nearly 3,000nm (deep infrared)
- Short-wavelength light (UV, blue): high-frequency, carries more energy, ionizing at sub-UV wavelengths; blocked by skin and lens; causes sunburn and cataracts with excessive exposure
- Long-wavelength light (red, near-infrared, infrared): low-frequency, non-ionizing, penetrates deeply into tissue
- The body blocks UV at the skin surface, causing Inflammation 炎症 (sunburn) rather than allowing penetration; the lens and cornea also block UV, which is why cataracts can result from chronic overexposure
How Long-Wavelength Light Improves Mitochondrial Function
- Early assumption: mitochondria directly absorb long-wavelength light. This was found to be incorrect
- Revised mechanism: long-wavelength light is absorbed by water surrounding mitochondria (nano-water)
- This absorption reduces water viscosity, increasing the spin rate of the ATP synthase molecular motor
- A secondary downstream effect: more mitochondrial electron transport chain proteins are synthesized, laying more “track” for energy production
- Two effects observed:
- Immediate: faster ATP production
- Longer-term: increased mitochondrial protein synthesis
Light Penetration Through the Body
- Long-wavelength light passes through:
- Skin (only a few percent exits the other side; the rest is absorbed internally)
- Standard clothing — even 6 layers of t-shirt; color of clothing makes no difference
- The skull (confirmed experimentally; bone does not significantly block it)
- The hand (bones are invisible; deoxygenated blood in veins absorbs it, which is what shows up in imaging)
- It does NOT pass through rubber or deoxygenated blood (the latter absorbs it strongly)
- Inside the body, long-wavelength light scatters in all directions, reaching distant tissues
- Application: a biomedical engineer at UCL (Ioannis Tachtsidis) passes red/near-IR light through the skulls of neonates who have had strokes to monitor mitochondrial function as a survival metric — approved through ethics committees
Blood Glucose Regulation
- Bumblebee pilot study: after starvation and glucose loading, bees given red light had significantly lower blood glucose rises than those given blue light
- Human study: subjects fasted overnight, consumed a glucose load, then had red light shined on a small patch of their back (~4×6 inches)
- Result: blood glucose peak reduced by over 20%
- Oxygen consumption simultaneously increased, consistent with mitochondria using more glucose
- The illuminated area was too small to account for the effect locally — confirmed to be a systemic mitochondrial response
- Implication: chronic exposure to blue-shifted LED light throughout the day may be raising blood glucose in a detrimental direction
Vision Improvement with Red Light
- The retina has the highest mitochondrial density of any tissue in the body — it has the highest metabolic rate and ages fastest
- Experiment: subjects tested for color detection thresholds (visual function test using Tritan and Protan axes with added visual noise)
- After a 3-minute exposure to 670nm light, thresholds improved in all but one subject
- Average improvement: ~20%
- Effect lasted 5 days, then reset — same finding replicated in flies, mice, and humans
- The effect is a binary switch, not a dose-response curve — sufficient energy at the right wavelength triggers a lasting 5-day change
- Wavelength guidance:
- 670nm and above works well
- Effects tend to diminish below 650nm
- Near-infrared range (~700–900nm) is also effective
- Energy level: originally tested at 40 mW/cm² (very bright); lab now uses ~8 mW/cm² with equivalent effect; one experiment achieved results near 1 mW/cm² (very dim)
- Eyes open vs. closed: makes little difference — long-wavelength light passes through eyelids effectively
- Age effect: improvements are more pronounced in older individuals (40+) because mitochondria in the aging retina have more room for improvement; younger people can still respond
Circadian Timing of Red Light Therapy
- Morning is the optimal window: from perceived sunrise to approximately 11:00am
- Mitochondrial protein composition changes significantly over a 24-hour cycle
- In the morning, mitochondria are maximally producing ATP; in the afternoon, they are performing other cellular maintenance functions (“doing the ironing”)
- Afternoon red light therapy is significantly less effective
- This pattern is conserved across flies, mice, and humans
Macular Degeneration and Disease Applications
- Initial clinical trial for macular degeneration showed no benefit in the patients themselves — but their husbands (controls without macular degeneration) showed significant vision improvements
- Post-hoc analysis: the patients’ disease had progressed too far for intervention to be effective
- A subsequent study by ophthalmologist Ben Burton (UK), targeting earlier-stage patients, showed significant positive results
- Same limitation found with rheumatoid arthritis trials: subjects with already-deformed joints showed no benefit; intervention needs to occur before structural damage is severe
- Red light reduces the magnitude of apoptosis (cell death) by keeping mitochondrial membrane potential above the threshold that triggers the molecular “eat me” signal
Parkinson’s Disease and Neuroprotection
- Researcher John Mitrofanis (Australia) induced Parkinson’s disease in primates and shined red light on the abdomen — significantly reduced symptoms
- The relevant nucleus (substantia nigra) is deep in the brain; the mechanism is believed to be systemic mitochondrial protection, reducing the pace of Dopamine 多巴胺 neuron death
- Consistent with the principle that mitochondria across the body communicate and act as a community
The Danger of LED and Short-Wavelength Light
- Modern LEDs are heavily weighted toward short wavelengths (blue-shifted)
- When retinal cells (in mice) are exposed to LED light, mitochondria can be observed in real