12 Surprising Immune System Killers

Viruses and bacteria aren't the only bad actors that test your immune system. Your T cells are being tested 24/7, and by some surprising culprits, ranging from modern-day convenience items in your home to deep-rooted emotions. We scoured the data to bring you common immune-system wreckers so you can eliminate them from your life.

Immune System Assassin: In a major review published in the International Journal of Environmental Research and Public Health, cancer researchers found a strong connection between Roundup and lymphoma. Used in many yards and farm fields to kill weeds,"excessive" levels of Roundup is also now detected in a popular U.S. food ingredient.

Researchers believe the chemical, once believed to be nontoxic, is mutating white blood cells, sending the body's immune system into a diseased state.

Immunity Boost: Eat organic whenever possible. GMO seeds are designed to withstand heavy sprayings of glyphosate, the main ingredient in Roundup. That type of chemical assault is banned in organic agriculture. To steer clear of other toxic pesticides, avoid nonorganic produce on the 2014 "Dirty Dozen" list.

Immune System Assassin: Microwavable popcorn bags are commonly coated in nonstick chemicals called perflurorinated compounds (PFCs) so grease doesn't penetrate the bag. A recent study in Environmental Health found levels the government considers "safe" are 100 to 1,000 times too high for children. These chemicals have been shown to mess up your immune system; vaccines given to people with higher levels of PFCs in their bodies were much less effective.

Immunity Boost: Make popcorn on the stovetop or use this microwave popcorn trick. These same chemicals hide out in many stain-repellent carpets and furniture treatments and greaseproof fast-food containers and wraps, so be sure to cut down on these exposures, too.

Immune System Assassin: Some of the same nonstick chemicals added to popcorn bags also hide out in many nonstick pots and pans. A recent study published in Environmental Health Perspectives found women with higher levels of hormone-disrupting perfluorinated compounds like perfluorooctanoic acid (PFOA) and perfluorooctane sulfonate (PFOS) in their blood were more likely to have the autoimmune disease osteoarthritis.

Immunity Boost: Don't panic if you have nonstick pans, but when you start noticing scratches and chips, replace them with glass, made-in-the-USA cast iron, or stainless steel to avoid nonstick chemicals.

Immune System Assassin: Your immune cells are social, and they want you to be, too. T cells scan your body for disease and then share information like honeybees, according to a recent scientific breakthrough. But if you're not so social, it could impact your ability to fight disease. Ohio State researchers recently found worrying about close relationships acts like a chronic stressor that suppresses your immunity. Previous research found we're more likely to get sick—and die earlier—when we have fewer social connections.

Immunity Boost: If you just can't seem to click with new people, try volunteering where you'll find generous and grateful folk, such as at a soup kitchen. You're not necessarily looking to make new friends there—though it's great if you do. But you may find it easier to lower your guard in an atmosphere of altruism and gratitude.

Immune System Assassin: Slacking in the sleep department can lower the number of killer cells your body needs to wipe out infections. A University of Chicago study found that sleeping just four hours a night for a week cut the number of flu-fighting antibodies in study participants' systems in half.

Immunity Boost: Stay away from looking at screens for at least two hours before going to bed. The light from electronics' screens can trick your brain from easing into sleep mode. Aim for seven to nine hours of uninterrupted sleep.

Immune System Assassin: Taking antibiotics can slash your levels of cytokines, the hormonal messengers your immune system relies on during sickness.

Immunity Boost: Cold and flu and most middle ear and sinus infections are caused by viruses, so taking antibiotics will do nothing for your ailment and will wipe out immune-supporting bacteria in your gut. When you are on antibiotics, be sure to take doses on time and finish the entire course. Eat low-sugar yogurt and fermented foods to repopulate your gut flora.

William Davis, MD, author of Wheat Belly Total Healthrecommends taking a probiotic to evict the gut bacteria that are causing your cravings. "Taking a high-potency probiotic accelerates colonization by healthy flora once the disruptive effects of bowel-toxic grains are absent," he says. He recommends VSL#3, Garden of Life Primal Defense, and ReNew Life. 

Immune System Assassin: Bisphenol A, or BPA, coats the inside lining of most canned foods. In 2010, University of Michigan School of Public Health researchers found that adults with higher levels of BPA also had higher cytomegalovirus antibody levels, suggesting that their cell-mediated immune system is malfunctioning.

Immunity Boost: To avoid BPA, opt for fresh or frozen foods, versus canned, or reach for soups and broths in Tetra Pak boxes. 

Immune System Assassin: Eating 100 grams of sugar (think a bottle of soda, fruit yogurt, and a candy bar) significantly lowered the ability of white blood cells to kill bacteria for up to five hours, according to a study published in the American Journal of Clinical Nutrition.

Immunity Boost: Avoid foods with added sugar as much as possible, especially during cold and flu season. It's in obvious places, such as juices, sodas, and desserts, but significant amounts also hide out in many low-fat yogurts, bread, condiments, and salad dressings. 

Immune System Assassin: Fluids help flush your body of immune-damaging toxins and carry nutrients to any infection sites. Little-known fact? Many of us walk around mildly dehydrated most of the time without even knowing it.

Immunity Boost: If your pee is dark yellow in the morning, drink more water before bed—you're aiming for pale yellow for a visible sign of proper hydration.

Immune System Assassin: Researchers at the Johns Hopkins Children's Center found children exposed to antibacterial chemicals are prone to food and environmental allergies. Children with higher levels of antibacterials in their urine experienced higher IgE blood antibody levels. High antibody counts signal a response to an allergen; the researchers believe the antibacterial chemicals alter healthy immune system development.

Immunity Boost: Children with more triclosan, a popular antibacterial soap chemical, in their blood high the highest allergy risk. Washing with regular soap and water works just as well, without the added risks.

Immune System Assassin: Cutting-edge research is unearthing a connection between air pollution—specifically polycyclic aromatic hydrocarbons (PAHs)—and damaged immune systems. PAHs pour from exhaust pipes and flake off of driveways, playgrounds, and parking lots treated with coal-tar sealant.

Immunity Boost: Check local pollution levels and avoid exercising outdoors on high pollution days. Push for a coal-tar sealant ban in your city, state, or municipality to reduce PAH exposure from blacktop surfaces. (Safer alternatives without coal tar are readily available at most hardware stores.)

Immune System Assassin: Using toxic insecticides to kill household and lawn pests could increase your risk of developing an autoimmune disease, according to data recently presented at an American College of Rheumatology meeting. Women who sprayed insecticides at least six times a year were about 2½ times more likely to develop lupus or rheumatoid arthritis. Those who hired a professional lawn service to apply insecticides to their yard had a two times greater risk.

Immunity Boost: Use nontoxic pest control measures and use these organic lawn-care tips to keep your house pest free without chemicals. Plant native plants in your garden to attract beneficial insects that prey on pests, too.