Build Your Immunity this Whey
Whey protein is an effective immune-boosting cocktail.  Whey is rich in an amino acid called cysteine, which converts to glutathione in the body. Glutathione is a potent antioxidant that fortifies cells against bacterial or viral infection. For the highest concentration of protein, try something called powdered whey protein isolate, which is more pure — and more expensive — than concentrate. Fortify your morning smoothie with whey protein powder or try another source: yogurt. The clear liquid that forms on top of most cartons of yogurt is pure whey protein — so don't drain it off, just stir it back into the yogurt. 

I advise making a smoothie this way: at the bottom of your blender first add your whey protein powder (I prefer the Whole Foods 365 store brand), then add several tablespoons of steel-cut oats, a sprinkle of cinnamon, a sprinkle of nutmeg, several tablespoons of Greek vanilla yogurt, whatever fruit you want, a couple of ice cubes, and however much Almond or Rice milk you want.  Then blend it to as a smooth consistency as desired.

Dressing for Anti-Disease Success
Eating a salad for lunch is smart. Drowning it in fat-free dressing isn't. A recent study from Iowa State University found that without dietary fat, your body doesn't absorb some of the disease-fighting nutrients in vegetables. Researchers fed seven people salad for 12 weeks and tested their blood after each meal. Those who topped their salads with fat-free dressing consistently failed to absorb carotenoids, antioxidants that have been linked to improved immunity.

Fat is necessary for the carotenoids to reach the absorptive intestinal cells. Choose dressings with healthy fats from olive or nut oils, such as Many Seeds of Change (available at Whole Foods or in the crunchy section of your neighborhood market) and any of Annie's Naturals dressings.  

If you're feeling adventuresome, try making your own. For an Italianate, try 2 or 3 parts extra virgin olive oil to 1 part balsamic vinegar; for something with an Asian influence, go 3 parts sesame oil to 1 part rice wine vinegar.

Build your immune system up by choosing your foods that fight off disease causing agents!