#4. Green Tea
Rich with polyphenols, catechins, and flavonoids — all of which boost immune-system function — green tea can do more than help rid your body of toxins. According to a study from Purdue University, an antioxidant in green tea called EGCG helps keep the body free from cancer. The same amount of EGCG can also be found in decaf tea.
Probiotics — or “good” bacteria cultures — found in yogurt have been known to help digestion and keep immune function solid. Some studies have shown that consuming yogurt daily can even reduce your susceptibility to colds by 25 percent. Just make sure you see “live and active cultures” on the yogurt’s label. Oh, and watch for yogurt that’s low-fat but packed with sugar; your best bet is plain Greek yogurt.
#6. Brussels Sprouts
Packed with vitamin A, Brussels sprouts help keep your immune system healthy while also building collagen to fight wrinkles. Beer, fries, and sprouts — sometimes Belgians get it right.
NEXT: ONIONS & GARLIC