Tea Off Against Colds
Not just any hot tea, though. Chamomile, according to researchers from London's Imperial College, is the one that'll help prevent sickness.

In a recent study, they found people who drank five cups of the brew a day for 2 weeks had increased blood levels of plant-based compounds called polyphenols, some of which have been associated with increased antibacterial activity. Levels remained high for 2 weeks after subjects stopped drinking the tea.  

Chamomile tea also raised levels of glycine, a mild nerve relaxant and sedative.

Knock 'em Dead 
There's a killer living in all of us.  Known as a macrophage and produced deep in your bone marrow, it's a white blood cell that roams the body, picking fights with bacteria, viruses, or any other intruders.  

But it only works if you help it.  These killer cells are activated by beta-glucans, a component of fiber foods. The best source?  Oats.  So eat your oatmeal.  Or, put two or three tablespoons of steel-cut oats in with your protein powder at the bottom of your blender when you go to make your smoothie.

The steel-cut oats, like McCann's Irish Oatmeal, have double the amount found in the rolled, quick-cooking kind.