Another Good Reason to Eat Chocolate

Much to the delight of chocoholics everywhere, dark chocolate specifically. Dark chocolate contains antioxidants from the cocoa beans called cocoa flavanols or CFs.

In a recent study, the authors hypothesize that cocoa flavanols may improve blood flow by relaxing blood vessels, thereby enhancing the availability of oxygen and nutrients to the blood vessels of the eye and brain. This process is believed to potentially improve both visual and cognitive function.

The retina in particular, they point out, is very highly vascularized, meaning it is rich in blood vessels and may be the area of interest in these study findings. It is worth noting that this study was not supported by any cocoa or chocolate companies.

The study examined how consuming milk chocolate vs. dark chocolate affects visual acuity, as well as large and small letter contrast sensitivity. 

Milk chocolate can have as little as 10% of Coco flavanols but has more fat, were as dark chocolate contains 50 to 90% of Coco flavanols.

It was found to show improvements within two hours of ingesting a 47 g chocolate bar. 

The primary outcomes of the study were changes in retinal perfusion, using Optical coherence tomography angiography (OCT-A) is a noninvasive image modality that provides depth-resolved imaging of the retinal and choroidal vasculature. 

High flavonol, dark chocolate, help to activate stem cells and repairs, blood vessels.

Sources:

www.scientificamerican.com

www.health.harvard.edu

www.nature.com

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Zeaxanthin for Vision

In a recent blog post I discussed lutein, a carotenoid. Another carotenoid is zeaxanthin, which can be found in foods you eat daily. It also comes with a host of benefits, like promoting eye health. Zeaxanthin is the companion of Lutein and often appears side-by-side in foods. Carotenoids are powerful antioxidants. They give fruits and vegetables their vibrant hue.

Zeaxanthin and lutein are present in significant concentrations within the macula, where they are referred to as macular pigments. These antioxidants are present in various vegetables and also naturally occur in the lens, retina, and macula of your eyes.  That’s why doctors believe they play a key role in healthy vision. Zeaxanthin helps safeguard your eye tissues by filtering harmful sunlight and preventing oxidative damage caused by free radicals.

The macula is the most sensitive part of the retina and the part with the highest concentration of photoreceptors. These are special cells that convert light into signals that can be interpreted by your brain. As such, the macula is the place where your sharpest vision is produced. It is also responsible for your ability to perceive colors.

Five servings of fruits and vegetables daily provide enough zeaxanthin and lutein for your body. Make sure you choose each color of the rainbow, to help you continue to see rainbows.

Food Sources of Zeaxanthin:

If you are looking to boost your zeaxanthin intake, look for green, leafy vegetables since they have the highest amount of the carotenoid. The chlorophyll in dark green vegetables actually masks the lutein and zeaxanthin (yellow-orange) pigments, giving the vegetables their recognizable green color.

You shouldn't limit yourself to just a few veggies. In addition to greens, eggs and brightly colored fruits and vegetables are also good sources of both zeaxanthin and lutein. Eggs may be your best source. Although vegetables often contain more zeaxanthin, it isn't naturally combined with the fat-soluble enhancers needed for absorption, which lowers their bioavailability. Your body absorbs it more efficiently from eggs due to their fat content.

After ingestion, zeaxanthin is preferentially transported to the ocular tissues. It is incorporated into the lens, the transparent, curved structure located at the front of the eye. This yellow pigment functions as a protective barrier.

 

Sources:

www.webmd.com⁠

www.health.clevelandclinic.org⁠

www.verywellhealth.com⁠

 

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Lutein is an organic pigment that belongs to the carotenoid family, closely related to beta-carotene and vitamin A. Commonly called the "eye vitamin," lutein is made by plants. It's present in large amounts in the macula area of the eye, which plays a crucial role in vision.

These essential nutrients can improve eye health and reduce the risk of macular degeneration. Research shows that this antioxidant plays a key role in maintaining vision and supporting eye health. Lutein also has anti-inflammatory properties. 

Lutein is known to support the improvement or prevention of age-related macular degeneration and cataracts, which are leading causes of blindness and vision impairment. 

Lutein can help protect the retina from phototoxic light damage.

Food sources rich in Lutein include:

• Berries
• Broccoli 
• Papaya 
• Peaches
• Mangoes
• Egg yolks
• Kales
• Spinach
• Peas
• Corn
• Bell peppers
• Pistachios

Sources:

www.aarp.org

www.healthcentral.com

www.webmd.com

www.pmc.ncbi.nlm.nih.gov

#PearleVisionRobinson

#DrClaudiaWendel

#PittsburghOptometrist

#PittsburghEyeCare