I always encourage cancer patients to support their immune systems by taking supplements and eating a healthy diet. And this isn't just because cancer can diminish the immune system, leaving patients susceptible to other diseases. It's also because we can actually harness the power of the immune system to help fight the cancer itself. Now there's new research that shows how this works and why it's so important.

Have you ever asked yourself why egg yolks are yellow? And what's the difference between eggs with yolks that are pale yellow, deep yellow, or even orange? There are some very interesting answers to this question. And the answers all point out to how nutritious and important egg yolks are to our diets.

If you needed one more reason to make sure your vitamin D levels are adequate, Duke-NUS Medical School and Duke University can give it to you. Researchers at these institutions recently conducted a study of elderly Chinese people that linked low vitamin D levels to a condition that we're all hoping to avoid as we age.