The natural body oils that lubricate and protect the skin get washed away by warm (and especially hot) showers paired with soaps that strip the skin. Without those oils, the skin is more vulnerable to bacteria and viruses, and can also look and feel dry and uncomfortable. Because the body wants to keep the skin in healthy, protected shape, frequent washing can even encourage the body to overproduce oil, leading to a viscious cycle of cleansing and oil production. Many people have found that when they stop washing hair and skin as often, after an adjustment period, the body naturally decreases the amount of oil it produces and less washing is needed.
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