Cold Remedies: say bye bye cold forever Cut Some Calories

Even slightly overweight people who slashed their calorie intake by just 10 percent ended up with heartier T cells, according to the Journal of Gerontology, possibly because a little extra weight can prompt the body to release a certain immune-suppressing hormone-like compound. Stash a pack of sugar-free gum in your bag and reach for a stick when you crave a midafternoon snack, says Sharon Zarabi, R.D., a nutritionist in New York City. Or swap your regular latte for plain green tea; you'll not only save hundreds of calories but also ward off infection.