Your eye's health depends largely on what you eat, plus toenails are helping determine heart disease.

A diet high in fish and healthy fats may lower your risk for age-related eye diseases. Researchers at the University of Melbourne analyzed data from nine large studies that looked at the link between omega-3 fatty acids and macular degeneration, an eye disease that can cause severe vision loss.

They found that people with the highest intake of omega-3's had a nearly 40% reduced risk for macular degeneration. Researchers suspect components of omega-3 fatty acids may help restore nerve cells in the retina. However, experts say more rigorous studies need to be done before they can recommend routine intake of omega-3's for the prevention of eye diseases.

Experts might be able to determine a woman's risk of heart disease due to smoking from an unexpected place: her toenails. Toenails grow relatively slowly, researchers at the University of California, San Diego, say nail clippings might be able to provide a more long-term look at nicotine exposure than urine or saliva samples. which only reflect a few days worth of tobacco.

The study included more than 60,000 women and those who had been diagnosed with heart disease had twice the amount of nicotine in their toenails than women without heart disease.