Yes, yes, I am back on the Superfoods bus. One of the neat things about the author is that he has a background in ophthalmology and he explains what you can learn about your health from your eyes.
If you look at the white part of your eyes, particularly the area just to the right or the left of the iris and you see yellow discoloration (pinguecula) that could be the result of exposure to pollutants and UV light.
If you noticed a yellow ring around the peripheral parts of your cornea this is a warning sign that your cholesterol may be high.
In short, if your eyes have a yellowish look, they're telling you something.