4.8 • 3.6K Ratings
🗓️ 8 May 2025
⏱️ 11 minutes
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0:00.0 | We ask a lot of questions about our diet. |
0:03.0 | What's the right way to treat a chronic illness, fight off a virus, lose weight? |
0:09.0 | The problem is we get a lot of different answers. |
0:12.0 | Well, I'm here to help. |
0:14.0 | Welcome to the Nutrition Facts podcast. |
0:16.0 | I'm your host, Dr. Michael Greger. |
0:19.0 | Today we look at why hair turns gray. |
0:21.1 | What's the role of genetics and what we can do about it? |
0:25.1 | The graying of hair is one of the most obvious signs of aging. |
0:31.1 | It's also known by a technical term that I'd never heard of, Canities. |
0:35.6 | The first time I saw the word I misread it, wondering what gray hair |
0:39.4 | had to do with dentistry. Evidently, gray hair isn't really white, but a pale yellowish tinge |
0:46.0 | of the constitutive keratin protein, but like polar bears, it just looks white, by the way, |
0:51.6 | light reflects off of it. Why is hair pigmented in the first place? |
0:57.8 | Some suggest it may be for detoxification as natural toxins, like heavy metals, |
1:03.1 | bind to the pigment melanin to be extreated from the body through hair outgrowth. |
1:09.1 | That's why you can estimate the amount of fish consumption from the mercury content of children's |
1:14.5 | hair clippings. |
1:15.7 | Why analysis of hair mercury may be warranted before pregnancy in women who eat a lot of fish, |
1:23.7 | and why the levels of mercury in the hair of those eating plant-based diets were found to be |
1:28.3 | up to ten times lower than those who just occasionally ate fish. Within three months of switching |
1:34.8 | to a plant-based diet, the levels of mercury, lead, and cadmium growing out in your hair |
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