What If We Got Sunlight All Wrong? The Truth About Vitamin D & Chronic Disease
The Dr. Hyman Show14 Juli 2025

What If We Got Sunlight All Wrong? The Truth About Vitamin D & Chronic Disease

Sunlight has long been vilified for its link to skin cancer, yet hiding from it entirely may be costing us far more. Vitamin D, made primarily through sun exposure, plays a pivotal role in everything from bone strength and immune defense to mood regulation, cancer prevention, and even longevity. Shockingly, over 80% of people have levels too low to unlock its protective powers—putting them at greater risk for chronic illness, and even premature death. Research shows that raising vitamin D to optimal levels could prevent hundreds of thousands of deaths each year, rivaling or surpassing the impact of many medical interventions. With a few minutes of daily sun, the right kind of supplementation, and awareness of how our lifestyles block this essential nutrient, reclaiming our health may be simpler than we think. In this episode, I discuss, along with Dr. Cindy Geyer, the critical role of vitamin D in preventing chronic disease, boosting immunity, and promoting overall health. Dr. Cindy Geyer received her bachelor of science and her doctor of medicine degrees, with honors, from the Ohio State University. She completed residency in internal medicine at Strong Memorial Hospital in Rochester, N.Y. and is triple board certified in internal medicine, integrative medicine and lifestyle medicine. This episode is brought to you by BIOptimizers. Head to bioptimizers.com/hyman and use code HYMAN10 to save 10%. Full-length episodes can be found here: Do You Need To Take Vitamin D?Choosing Skin Care Products that Won’t Make You SickWhy Boosting Your Vitamin D Could Change Your Life

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Office Hours: The Fiber Trend—How Much Is Too Much?

Office Hours: The Fiber Trend—How Much Is Too Much?

Fiber is having a moment—but more isn’t always better. From “fiber maxing” trends to high-fiber hacks promising weight loss and better metabolism, it’s easy to assume that piling on more fiber is the ...

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The Skill No One Teaches Us About Love | Baya Voce

The Skill No One Teaches Us About Love | Baya Voce

Falling in love can be easy. Staying connected when conflict and stress show up is where the real work begins. On this episode of The Dr. Hyman Show, I sit down with relationship repair expert Baya V...

18 Mars 1h 20min

Office Hours: Your Pregnancy & Postpartum Questions Answered

Office Hours: Your Pregnancy & Postpartum Questions Answered

Pregnancy doesn’t just change your life—it transforms your entire biology. Hormones shift, metabolism adapts, nutrient needs increase, and your nervous system recalibrates in ways most women are nev...

16 Mars 30min

Why IVF Isn’t Fixing the Fertility Crisis (and What Actually Will) | Dr. Ann Shippy

Why IVF Isn’t Fixing the Fertility Crisis (and What Actually Will) | Dr. Ann Shippy

Fertility struggles are often treated as a problem to solve only after they appear. But what if they’re actually a signal from the body that something deeper needs attention? On this episode of The D...

11 Mars 1h 5min

Office Hours: Peptides 101: The Truth About GLP-1, Recovery, and Anti-Aging

Office Hours: Peptides 101: The Truth About GLP-1, Recovery, and Anti-Aging

Peptides are everywhere right now—touted as tools for weight loss, muscle growth, faster recovery, and even longevity. But what are they actually, and do they live up to the hype? In this episode of O...

9 Mars 20min

Halle Berry: Why Women Are Being Failed at Menopause

Halle Berry: Why Women Are Being Failed at Menopause

For decades, midlife has been framed as a time of decline for women — medically, culturally, and personally. Halle Berry is on a mission to change that. On this episode of The Dr. Hyman Show, she sha...

4 Mars 48min

Office Hours: The Truth About Environmental Toxins (And How to Protect Yourself)

Office Hours: The Truth About Environmental Toxins (And How to Protect Yourself)

Most of us think chronic disease is just about food, genetics, or aging. But there’s another major driver most doctors never talk about: your total toxic load. Every day, we’re exposed to chemicals in...

2 Mars 30min

Why You Can’t “Think” Your Way Out of Anxiety (It’s Your Nervous System) | Dr. Nicole LePera

Why You Can’t “Think” Your Way Out of Anxiety (It’s Your Nervous System) | Dr. Nicole LePera

If you’ve ever said, “I know my patterns — so why can’t I change them?” the answer may not be in your mind, but in your body. On this episode of The Dr. Hyman Show, I sit down with Dr. Nicole LePera,...

25 Feb 1h 6min

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