Blueberries may help protect against age-related macular degeneration, and black currants may help halt the progression of glaucoma.
Images thanks to Jacob Whittaker, Chatirygirl, Rose Holley, Incola, Rick Heath, Bfishadow, Laurel Fan, Rob Qld, suziesparkle, and @rsseattle via Flickr; Evan-Amos, Fir0002, Wiseman42, Stephane8888, and Rasbak via Wikimedia Commons; and the National Eye Institute. Thanks to Ellen Reid for her image-finding expertise and Jeff Thomas for his Keynote help.
Once we've preserved the pigment in our retinal pigment epithelial cells, we need to keep them alive, which may be where anthocyanin phytonutrients come in. Anthocyanins, from the greek anthos—meaning flower, and kyanos, meaning blue—blue flower, are natural plant pigments that make pansy's look purple and turns green cabbage into purple cabbage, yellow corn into purple corn, brown rice to purple rice, white potatoes to blue potatoes, orange carrots to purple carrots, and turns blueberries into, well blueberries and keeps blackberries black.
As we age our critical RPE layer starts to break down, but we may be able to decelerate that aging with blueberries.Here are human RPE cells in a petri dish exposed to various stresses. The ones bathed in blueberry anthocyanins had fewer free radicals, and a lower proportion of aged cells, suggesting that blueberries and these other red/blue/purple pigmented fruits and vegetables may help prevent age-related macular degeneration. And blueberries may be especially important for blue eyes, as we saw in an earlier video.
Preventing is nice but what you if already have a disease like glaucoma, an incurable eye disease in which your optic nerve, which connects your eye to your brain, starts deteriorating and you start losing your visual fields.
A few years ago Japanese researchers showed they could apparently halt the progression of disease with black currants. They gave people black currants for 6 months, significantly boosting the blood flow to their optic nerve. The results suggested that black currants might be a safe and valuable option, but it was not double-blind, no control group, so I didn't report it when it was initially published, but here we go! Glaucoma patients split into two groups—half got black currants the other half didn't— let's see what happened.
Here's a measure of the deterioration of their visual fields in both groups in the 2 years leading up to the study. Worse worse worse worse, despite taking the best glaucoma drugs on the market. Then the study starts. The berry-free control group continued to worsen, but the berries appeared to stop the disease in its tracks, one year, two year. And since there's no downside, only good side effects to berries, everyone with glaucoma should be eating berries every day.
To see any graphs, charts, graphics, images, and quotes to which Dr. Greger may be referring, watch the above video. This is just an approximation of the audio contributed by Ariel Levitsky.
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This is the third of a 4-part video series on the latest science on preventing and treating vision loss. In Greens vs. Glaucoma, I detailed the best foods to help prevent glaucoma and in Dietary Prevention of Age-Related Macular Degeneration I did the same for age-related macular degeneration, introducing the concept of retinal pigment epithelial cells. In the last installment, Dietary Treatments for Computer Eye Strain, I’ll address dietary interventions for nearwork-induced visual fatigue.
I’ve mentioned anthocyanins before in:
They may be why purple potatoes (Anti-Inflammatory Effects of Purple Potatoes) and purple cabbage (Superfood Bargains) may be preferable. Anthocyanins are the pigments in red and purple cabbage that allow for the kitchen chemistry in Testing Your Diet with Pee & Purple Cabbage.
And currants in Enhanced Athletic Recovery Without Undermining Adaptation.
My previous treatment of glaucoma can be found in Prevent Glaucoma and See 27 Miles Farther.
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