keeping good bacteria

A DAILY shower is a deeply ingrained American habit. Most people would no sooner disclose they had not showered in days than admit infidelity. But Jenefer Palmer, 55, of Malibu, Calif., cheerfully acknowledged recently that she doesn’t shower or shampoo daily and doesn’t use deodorant. Ever.

Defying a culture of clean that has prevailed at least since the 1940s, a contingent of renegades deliberately forgoes daily bathing and other gold standards of personal hygiene, like frequent shampooing and deodorant use.

To the converted, there are many reasons to cleanse less and smell more like yourself. “We don’t need to wash the way we did when we were farmers,” said Katherine Ashenburg, 65, the author of “The Dirt on Clean: An Unsanitized History.” Since the advent of cars and labor-saving machines, she continued, “we have never needed to wash less, and we have never done it more.”

Retention of the skin’s natural oils and water conservation are two reasons Ms. Palmer and others cite for skipping a daily shower. Some have concluded that deodorant is unnecessary after forgetting it once with no social repercussions, or are concerned about antiperspirants containing aluminum, even though both the National Cancer Institute and the Alzheimer’s Association don’t share those concerns. Shampooing as little as possible can help retain moisture in dry locks and enhance curl shape, argue adherents of the practice; for some men, it’s about looking fashionably unkempt.

Resist the urge to recoil at this swath of society: They may be on to something. Of late, researchers have discovered that just as the gut contains good bacteria that help it run more efficiently, so does our skin brim with beneficial germs that we might not want to wash down the drain. “Good bacteria are educating your own skin cells to make your own antibiotics,” said Dr. Richard Gallo, chief of the dermatology division at the University of California, San Diego, and “they produce their own antibiotics that kills off bad bacteria.”