"But some scientists say we're overdoing it. All this killing may actually cause diseases like eczema, irritable bowel syndrome and even diabetes. The answer, they say, is counterintuitive: Feed patients bacteria."

""Probiotics (pills containing bacteria) have resulted in complete elimination of eczema in 80 percent of the people we've treated," says "

", a practicing physician and former member of the White House Commission on Complementary and Alternative Medicine Policy. Pizzorno says he's used probiotics to treat irritable bowel disease, acne and even premenstrual syndrome. "It's unusual for me to see a patient with a chronic disease that doesn't respond to probiotics.""

"Clinical trial data on probiotics is incomplete, but there are many indications that hacking the body's bacteria is beneficial."

"In sheer numbers, bacterial cells in the body outnumber our own by a factor of 10, with 50 trillion bacteria living in the digestive system alone, where they've remained largely unstudied until the last decade. As scientists learn more about them, they're beginning to chart the complex symbiosis between the tiny bugs and our health."

""The microbes that live in the human body are quite ancient," says NYU Medical Center microbiologist "

", a pioneer in gut microbe research. "They've been selected (through evolution) because they help us.""

"And it now appears that our daily antibacterial regimens are disrupting a balance that once protected humans from health problems, especially allergies and malfunctioning immune responses."

""After the Second World War, when our lifestyles changed dramatically, allergies increased. Autoimmune diseases like diabetes and inflammatory bowel disease are increasing," says "

", a University of Helsinki allergy expert. "The theory behind (what causes) the diseases is the same: Lacking bacterial stimulation in our environments may cause this increase. I think this is the tip of the iceberg.""

"In a recent study, Kukkonen and her colleagues gave a probiotic containing four strains of gut bacteria to 461 infants labeled as high risk for developing allergic disorders. After two years, the children were 25 percent less likely than those given a placebo to develop eczema, a type of allergic skin inflammation. The study was published in the January issue of "

"Microbial exposures early in life, scientists believe, cause mild inflammation that calibrates the body's responses to other pathogens and contaminants later in life. Without exposure as infants, researchers say, people can end up with unbalanced immune systems."

""Many of the most difficult problems in medicine today are chronic inflammatory
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