#31: Red, White, and Blue Light: Healing or Hype?

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Does red light therapy actually work? Can morning sun improve your health? Do blue light blocking glasses really help with sleep? In this episode, Dr. Bobby takes a deep dive into the science behind light therapy—what’s backed by evidence and what’s just hype.

Dr. Bobby shares personal experiences, from childhood eczema treated with sunlight to his daughter’s improved sleep from morning walks, and unpacks the latest research on red, white, and blue light exposure. With thousands of red light therapy devices on the market and endless claims about their benefits, it’s time to separate fact from fiction.

Starting with the strongest evidence, Dr. Bobby explores how light affects skin conditions, depression, and sleep. While white light (and UV) therapy  has long been used for conditions like psoriasis and seasonal affective disorder (SAD) 【AAD guidelines】, red light therapy is a mixed bag. Studies suggest it can improve wound healing 【Study】, aid hair regrowth 【RCT Review】, and even reduce wrinkles—but much of the research is small-scale and often funded by device manufacturers.

Deeper effects of red light therapy, such as pain relief for arthritis and fibromyalgia, remain controversial. Some studies show moderate pain reduction 【Meta-analysis on osteoarthritis】, while others suggest a placebo effect. And when it comes to weight loss or cognitive enhancement, the evidence is weak at best.

Finally, Dr. Bobby revisits the hype around blue light blocking glasses. While early studies suggested blue light exposure/protection might affect sleep, newer research, and expert opinion indicates that it’s not the light itself but rather the mental stimulation from screens that affects sleep 【Study】. The best solution? Reduce screen exposure and engage in relaxing activities before bed.

Takeaways:

1. Sunlight/UV exposure has well-documented benefits for skin conditions, depression, and sleep regulation. Morning light can help set your biological clock and improve sleep quality 【Study】.
2. Red light therapy shows some promise for surface-level treatments like wound healing, hair growth, and wrinkles, but claims about deeper effects, like pain relief or cognitive improvement, lack strong evidence.
3. Blue light blocking glasses may not be the key to better sleep—instead, reducing screen time and mental stimulation before bed is more effective.

Is light therapy worth the investment? Maybe. If you are thinking of  spending hundreds of dollars, consider trying an N-of-1 experiment—track your own results and see if it actually makes a difference. And, as always, focus on evidence-based approaches to living long and well.

Until next time, get outside, soak up some sun, and take the Health Type Quiz to better understand your health type!