如何增强免疫系统 | Dr. Roger Seheult
摘要
Dr. Roger Seheult 是 Loma Linda 大学经董事会认证的肺科、重症监护及睡眠医学医师。他概述了免疫健康的基础支柱，并阐释了阳光——尤其是红外线和红光——在支持mitochondrial function、减少Inflammation 炎症以及抵御传染病方面所发挥的强大而被低估的作用。对话涵盖了最大化光照的实用策略、光疗背后的科学原理，以及为何现代室内生活方式正在推动慢性疾病的发展。
核心要点
- 阳光是最易获取、最有效的红光/红外线疗法 —— 任何设备都无法完全替代它，即使每天仅 15–20 分钟也能产生可测量的生物学益处。
- 红外线能深入穿透人体（通过散射可达约 8 cm），刺激线粒体产生褪黑素，并减少细胞内的oxidative stress。
- 线粒体功能在 40 岁时下降约 70%，这种功能障碍几乎是所有主要慢性疾病的根源，包括糖尿病、高血压、痴呆症和心脏病。
- 绿色空间能显著放大红外线照射量 —— 富含叶绿素的叶片会反射红外线，与开阔环境相比，红外线剂量可能增加 2–4 倍。
- 纬度和日照时长——而非温度或湿度——预测了欧洲各国 COVID-19 的爆发时间，进一步证实阳光是关键的免疫因素。
- 美国人 93% 的时间在室内度过，造成长期红外线和红光不足，这与冬至后 1–3 周达到峰值的季节性疾病爆发相关。
- 一项随机对照试验显示，每天 15 分钟、940 nm 红外线光照持续 7 天，可改善 COVID-19 患者的血氧饱和度、呼吸频率、淋巴细胞计数，并缩短住院时间。
- 从白炽灯转向 LED 照明已将红光和红外波长从室内环境中去除，使人们主要暴露于蓝/绿色短波长光线之下。
详细笔记
免疫健康的”New Start”框架
Dr. Seheult 引用了 Dr. Neil Nedley 创造的一个助记词，作为其健康的基础方法：
- N — Nutrition（营养）：天然、最低程度加工的食物
- E — Exercise（运动）：轻度至中度运动可减少炎症；精英级别的运动可暂时抑制免疫力（J 形曲线关系）
- W — Water（水）：包括外部水疗法，如sauna和cold plunge，可激活先天免疫系统并刺激干扰素产生
- S — Sunlight（阳光）：详述如下
- T — Temperance（节制）：避免毒素（吸烟、饮酒等）
- A — Air（空气）：新鲜空气和植物挥发性物质（树木释放的化学物质）—— 与日本forest bathing研究相关，显示innate immune function有所改善
- R — Rest（休息）：7–8 小时高质量睡眠与更好的疫苗抗体反应和更少的年度疾病密切相关；与Cortisol 皮质醇和β肾上腺素受体调节有关
- T — Trust/Community（信任/社群）：通过社会联结或精神实践减压
阳光与红外线：深层生物学
红外光谱在很大程度上被忽视：
- 太阳能中只有 38% 是可见光；52% 处于红外光谱范围内
- 红外光子波长长、能量低、组织穿透力强 —— 类比于低频声音穿透墙壁的方式
- 单个红外光子可在组织中散射最远约 8 cm，照亮器官，而不仅仅是皮肤表面
- 红外线可穿透衣物，甚至可透过多层布料感受到
关键论文： “Melatonin and the Optics of the Human Body” —— Zimmerman & Ryder，2019年，Melatonin Research
线粒体在原位产生褪黑素：
- Mitochondrial melatonin的产生浓度比血液中松果体来源的褪黑素高 20 倍
- 这种褪黑素不分泌进入循环 —— 它作为局部抗氧化剂发挥作用
- 它中和 ATP 合成过程中产生的reactive oxygen species（ROS）
- 它还能上调glutathione系统
- 夜间，松果体来源的褪黑素进入血液，扩散至细胞和线粒体，发挥相同的抗氧化功能 —— 这可能是睡眠如此恢复性的关键原因
红外线还能：
- 激活细胞色素 c 氧化酶（电子传递链的复合体 IV）
- 增加一氧化氮的可用性
- 直接改善线粒体效率和 ATP 输出
阳光与传染病
流感季节性：
- 流感在北半球于冬至后 1–3 周达到峰值，在澳大利亚则在六月底/七月 —— 完全相反
- 在新加坡（近赤道），流感峰值无季节性，基本上是随机的
- 2009 年 H1N1 大流行在夏季达到峰值，使研究人员能够将流感与冬季变量解耦 —— 哈佛肯尼迪学院分析发现阳光对流感具有强烈的保护作用
COVID-19 爆发时间：
- 2021 年一项欧洲研究发现，温度和湿度与爆发时间的相关性趋于平坦
- 纬度呈现近乎完美的相关性 —— 距赤道更远的国家（芬兰最先，希腊最后）在日照缩短时严格按顺序经历了疫情爆发
维生素 D 背景：
- UVB 光驱动vitamin D合成 —— 这一点已被广泛接受
- 红外线对线粒体的影响代表了一种平行且同样重要的太阳益处
绿色空间与炎症
肯塔基州路易斯维尔植树研究：
- 在 4 平方英里区域内种植了 8,000 余棵成熟树木
- 2–3 年后：hsCRP（高敏 C 反应蛋白）下降 13% —— 相当于每周锻炼 3 次的效果
- 同期同一区域的收入、饮食或运动计划均无变化
- 提出的机制：叶绿素反射红外线，大幅增加绿色空间中的环境红外线照射量
红光研究：临床证据
Glen Jeffrey，伦敦大学学院（眼科学）：
- 早晨照射 3 分钟 670 nm 红光 → 老年受试者色彩敏感度提升 17%，效果持续数天
- 机制：视网膜具有所有组织中最高的线粒体密度；红光促进这些线粒体的 ATP 生产
- 在该研究中，效果特异性地出现在早晨
葡萄糖代谢研究（Jeffrey）：
- 30 名受试者摄入 75g 葡萄糖负荷
- 盲法对背部施加红光（670 nm）
- 干预组：血糖峰值更低，呼出 CO2 更高 —— 表明线粒体正在更高效地消耗更多燃料
牛津大学 / 莱顿大学研究（约 10,000 名受试者）：
- 过去 7 天的阳光照射量按小时预测改善的胰岛素敏感性和降低的甘油三酯
瑞典女性研究（约 30,000 名女性，20 年随访）：
- 高日照暴露组：全因死亡率更低、心血管死亡率更低、癌症死亡率更低
- 剂量-反应曲线（符合 Bradford Hill 因果关系标准）
- 引人注目的发现：大量晒太阳且吸烟的女性与避免阳光但不吸烟的女性死亡率相近
- 在 UK Biobank 约 40 万受试者（两性）中得到重复验证
巴西 COVID-19 随机对照试验：
- 940 nm 红外线背心，2.9 mW/cm²，每天 15 分钟，持续 7 天
- 安慰剂对照、双盲设计
- 结果：血氧饱和度改善、呼吸更深、心率和呼吸频率降低、淋巴细胞计数改善、住院时间缩短（对照组平均约 12 天，干预组更短）
台式红外灯研究：
- 850 nm 红外线，每天 4 小时，持续 8 周
- 夏季无效果（参与者已获得足够的室外红外线）
- 仅在冬季有统计学显著获益
实用建议
每日阳光照射：
- 15–20 分钟是目标阈值；超过该时间后收益递减
- 时间为
English Original 英文原文
How to Enhance Your Immune System | Dr. Roger Seheult
Summary
Dr. Roger Seheult, a board-certified pulmonologist, critical care, and sleep medicine physician at Loma Linda University, outlines the foundational pillars of immune health and explains the powerful but underappreciated role of sunlight — particularly infrared and red light — in supporting mitochondrial function, reducing Inflammation 炎症, and protecting against infectious disease. The conversation covers practical strategies for maximizing light exposure, the science behind phototherapy, and why modern indoor lifestyles are driving chronic disease.
Key Takeaways
- Sunlight is the most accessible and effective form of red/infrared light therapy — no device can fully replace it, and even 15–20 minutes daily produces measurable biological benefits.
- Infrared light penetrates deep into the body (up to ~8 cm via scattering), stimulates mitochondrial melatonin production, and reduces oxidative stress inside cells.
- Mitochondrial function declines ~70% by age 40, and this dysfunction underlies virtually all major chronic diseases including diabetes, hypertension, dementia, and heart disease.
- Green spaces dramatically amplify infrared exposure — chlorophyll-rich leaves reflect infrared light, potentially multiplying your dose 2–4x compared to open environments.
- Latitude and sunlight duration — not temperature or humidity — predicted COVID-19 surge timing across European countries, reinforcing sunlight as a critical immune factor.
- Americans spend 93% of their time indoors, creating a chronic deficit of infrared and red light that correlates with seasonal disease surges peaking 1–3 weeks after the winter solstice.
- A randomized controlled trial showed 15 minutes/day of 940 nm infrared light for 7 days improved oxygen saturation, respiratory rate, lymphocyte counts, and shortened hospital stays in COVID-19 patients.
- Shifting from incandescent to LED lighting has removed red and infrared wavelengths from indoor environments, leaving people exposed predominantly to blue/green short-wavelength light.
Detailed Notes
The “New Start” Framework for Immune Health
Dr. Seheult references a mnemonic coined by Dr. Neil Nedley as his foundational approach to health:
- N — Nutrition: Whole, minimally processed foods
- E — Exercise: Mild to moderate exercise reduces inflammation; elite-level exercise can temporarily suppress immunity (J-curve relationship)
- W — Water: Includes external water therapies such as sauna and cold plunge, which activate the innate immune system and stimulate interferon production
- S — Sunlight: Detailed extensively below
- T — Temperance: Avoiding toxins (smoking, alcohol, etc.)
- A — Air: Fresh air and phytoncides (chemicals released by trees) — linked to forest bathing research from Japan showing improvements in innate immune function
- R — Rest: 7–8 hours of quality sleep strongly associated with better antibody response to vaccines and fewer annual illnesses; connected to Cortisol 皮质醇 and beta-adrenergic receptor regulation
- T — Trust/Community: Stress reduction via social connection or spiritual practice
Sunlight and Infrared Light: The Deep Biology
The infrared spectrum is largely overlooked:
- Only 38% of solar energy is visible light; 52% is in the infrared spectrum
- Infrared photons have long wavelengths, low energy, and high tissue penetration — analogous to how low-frequency sound travels through walls
- A single infrared photon can scatter up to ~8 cm through tissue, illuminating organs, not just skin surface
- Infrared light penetrates clothing and can be felt through multiple layers
Key paper: “Melatonin and the Optics of the Human Body” — Zimmerman & Ryder, 2019, Melatonin Research
Mitochondria produce melatonin on-site:
- Mitochondrial melatonin is produced in concentrations 20x higher than pineal-derived melatonin in blood
- This melatonin is not secreted into circulation — it acts locally as an antioxidant
- It neutralizes reactive oxygen species (ROS) produced during ATP synthesis
- It also upregulates the glutathione system
- At night, pineal-derived melatonin enters the bloodstream, diffuses into cells and mitochondria, and performs the same antioxidant function — likely a key reason sleep is so restorative
Infrared light also:
- Activates cytochrome c oxidase (Complex IV of the electron transport chain)
- Increases nitric oxide availability
- Directly improves mitochondrial efficiency and ATP output
Sunlight and Infectious Disease
Influenza seasonality:
- Influenza peaks 1–3 weeks after the winter solstice in the Northern Hemisphere and in late June/July in Australia — directly inverse
- In Singapore (near equator), flu peaks are non-seasonal and essentially random
- The 2009 H1N1 pandemic, which peaked in summer, allowed researchers to decouple flu from winter variables — Harvard Kennedy School analysis found sunlight strongly protects against influenza
COVID-19 surge timing:
- A 2021 European study found temperature and humidity showed flat correlations with surge onset
- Latitude produced a near-perfect correlation — countries further from the equator (Finland first, Greece last) experienced surges in exact sequential order as daylight shortened
Vitamin D context:
- UVB light drives vitamin D synthesis — already well accepted
- Infrared light effects on mitochondria represent a parallel and equally important solar benefit
Green Spaces and Inflammation
Louisville, Kentucky tree study:
- 8,000+ mature trees planted in a 4-square-mile area
- 2–3 years later: hsCRP (high-sensitivity C-reactive protein) dropped by 13% — comparable to exercising 3x/week
- No changes in income, diet, or exercise programs in the same area
- Mechanism proposed: chlorophyll reflects infrared light, substantially increasing ambient infrared exposure in green spaces
Red Light Research: Clinical Evidence
Glen Jeffrey, University College London (Ophthalmology):
- 3 minutes of 670 nm red light in the morning → 17% increase in color sensitivity lasting for days in older subjects
- Mechanism: retina has the highest mitochondrial density of any tissue; red light boosts ATP production in those mitochondria
- Effect was morning-specific in this study
Glucose metabolism study (Jeffrey):
- 30 subjects given 75g glucose load
- Blinded red light (670 nm) applied to backs
- Intervention group: lower peak glucose and higher exhaled CO2 — indicating mitochondria were consuming more fuel more efficiently
Oxford / University of Leiden study (~10,000 subjects):
- Sunlight exposure in prior 7 days predicted improved insulin sensitivity and reduced triglycerides on a per-hour basis
Swedish Women’s Study (~30,000 women, 20-year follow-up):
- High sun exposure group: lower all-cause mortality, lower cardiovascular mortality, lower cancer mortality
- Dose-response curve (Bradford Hill criteria suggesting causation)
- Striking finding: women who got lots of sun and smoked had similar mortality to women who avoided sun and didn’t smoke
- Replicated in UK Biobank with ~400,000 subjects (both sexes)
Brazil COVID-19 RCT:
- 940 nm infrared light jacket, 2.9 mW/cm², 15 min/day for 7 days
- Placebo-controlled, double-blinded
- Results: improved oxygen saturation, deeper breaths, lower heart rate and respiratory rate, improved lymphocyte counts, shorter hospital stay (control avg: ~12 days vs. intervention group)
Desktop infrared lamp study:
- 850 nm infrared light, 4 hours/day for 8 weeks
- No effect in summer (participants already getting sufficient outdoor infrared)
- Statistically significant benefit in winter only
Practical Recommendations
Daily sunlight exposure:
- 15–20 minutes is the target threshold; diminishing returns beyond that
- Time of