Practical Light Hygiene: Dimmers and Bulbs

This episode is brought to you by Puori, Cozy Earth, Fatty15, and Birch Living.

Circadian rhythm is one of the most overlooked drivers of long-term health. It influences when we sleep, how we metabolize food, how our brain repairs itself, and even how our immune system functions. When this internal clock falls out of sync, the effects ripple through every system in the body.

Today on The Dhru Purohit Show, Dhru sits down with circadian biology expert Dr. Satchin Panda to explore the four pillars of circadian health and how losing alignment can contribute to cognitive decline and Alzheimer’s disease. Dr. Panda shares key strategies to reduce your risk and breaks down the science behind why protecting your master clock is critical for preventing chronic disease. He also explains the importance of time-restricted eating, how timing influences the effectiveness of medications and cancer immunotherapy, and the role exercise plays in detoxification. 

Dr. Satchin Panda is a world-renowned pioneer in circadian biology and a Professor at the Salk Institute for Biological Studies, where he holds the Rita and Richard Atkinson Chair. Recently named a semifinalist in the XPRIZE Healthspan competition, Dr. Panda leads "Team Circadian" in groundbreaking research to reverse biological aging through rhythmic optimization. His discovery of the blue-light sensitive protein melanopsin and his extensive research on time-restricted eating have reshaped global health guidelines, leading to featured presentations at premier international forums including the American Diabetes Association and the professional diabetes societies of Europe and Australia.

In this episode, Dhru and Dr. Panda dive into:

(00:59) The Circadian–Alzheimer’s Connection

(3:00) Why Light Controls Your Health

(26:36) Sleep as Brain Defense 

(34:01) Inside Your Master Clock 

(38:17) Why Meal Timing Matters 

(49:33) Time-Restricted Eating Explained 

(57:12) Timing Your Medications 

(1:01:27) Circadian Biology & Cancer Treatment 

(1:09:25) Exercise as Cancer Insurance 

(1:16:01) What Exercise Does at the Cellular Level 

(1:26:23) Minimum Effective Dose of Movement 

(1:57:47) The Circadian Challenge 

(2:06:21) Circadian Rhythm as Your Operating System 

(2:11:20) Final Takeaways 

Also mentioned in this episode:

• OnTime Health App 

• Human Performance Alliance 

For more on Dr. Satchin Panda, follow him on X/Twitter, Instagram, Ontime Health’s Instagram, YouTube, LinkedIn, or visit his Website.

This episode is brought to you by Puori, Cozy Earth, Fatty15, and Birch Living.

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