"You may still be sporting sandals, but cold and flu season will be back faster than you can say "Gesundheit!" Protect yourself with this spicy triple threat. Carrots are rich in immune-boosting vitamin A, zinc-packed pumpkin seeds ward off infection, and apple juice flows with sniffle-stifling vitamin C. "If your body needs to protect itself or heal, these three vitamins are essential," Zeratsky says. Another weapon: yogurt. Studies show that its good-for-you bacteria provide another line of defense against microbes...."