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Signs of heart disease and diabetes can be seen in the eye. So can signs of nutritional deficits, some kinds of nerve damage, and, amazingly, stress. Check out the blood pumping through the capillaries at 0:44 ~ so cool! (video):
http://video.nationalgeographic.com/video/news/140408-eyes-health-vin?utm_source=NatGeocom&utm_medium=Email&utm_content=inside_20140417&utm_campaign=Content
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