Sat, Nov 02, 2013 - Page 11 News List

Healthy skin has more bacteria than unhealthy skin
健康皮膚菌種多 別再拚命殺菌

Bottles of Dettol disinfectant, produced by Reckitt Benckiser Group PLC, sit on display in a supermarket in London on Feb. 8.
倫敦的超市二月八日展示Reckitt Benckiser 集團製造的瓶裝Dettol 消毒劑。

Photo: Bloomberg
照片:彭博社

Modern humans love being clean and often use disinfectants when washing their faces or taking showers. A recent study shows that there are more types of symbiotic bacteria found on normal healthy skin than on diseased skin. Even on a single person, there are less bacteria on skin with dermatitis than healthy skin. If an appropriate amount of moisturizer is used to protect the skin, it allows skin surface lipid film to normalize, providing symbiotic bacteria a normal living environment that is probably beneficial to maintaining healthy skin.

In the study, French researchers tested specimens of both healthy and inflamed areas of skin from people with eczema, and found that the distribution of bacteria on healthy and inflamed skin was not the same.

Troubled skin areas have less symbiotic bacteria, but much more staphylococcus aureus, staphylococcus epidermidis and staphylococcus haemolyticus than normal, healthy skin.

After completing microbial analysis, the researchers let people with troubled skin use moisturizer twice daily. After three months, the troubled areas were reduced by 38 percent and more than a third showed a 75 percent improvement. The three main types of staphylococcus, which had increased unusually, eventually showed an obvious decrease, and the microbial distribution became similar to that of normal skin areas.

But was it really the moisturizers providing oils that allowed the damaged skin to normalize and change the microbial distribution, or was it selenium and other probiotics and prebiotics in the moisturizing products that affected the distribution of microbes? Further research is needed to answer these questions, but researchers do think this study shows that the distribution of microbes on the skin can be used to determine skin health, and even to detect minor changes in the skin earlier to prevent inflammations.

TODAY’S WORDS 今日單字

1. specimen n.

抽樣;樣本 (chou1 yang4; yang4 ben3)

例: This specimen has been contaminated. You will have to get another one for testing.

(這個樣本被污染了。你為了測驗必須再抽樣。)

2. determine v.

判斷 (pan4 duan4)

例: We were unable to determine the cause of this effect.

(我們無法判斷造成這個結果的原因。)

3. prevent v.

預防 (yu4 fang2)

例: Getting plenty of exercise and having a healthy diet are great ways to prevent heart disease.

(有足夠的運動與飲食健康是預防心臟病的好方法。)


(Liberty Times, Translated by Kyle Jeffcoat)

現代人愛乾淨,動不動就喜歡使用殺菌清潔產品來洗臉、洗澡。不過,研究發現,正常健康皮膚上的「共生細菌」種類,比「病態皮膚」上的細菌多得多;即使是同一人,皮膚發炎處的細菌種類也會比較少。若能提供皮膚適當潤膚保護,讓皮脂膜正常、提供「共生菌群」正常生長環境,可能更有利維持皮膚健康。

在這項研究當中,法國研究人員分別在異位性皮膚炎患者皮膚的正常處與發炎處採樣,結果發現,健康皮膚與發炎皮膚上採得的細菌分布明顯不同。

「問題皮膚」上不僅共生菌的種類比較少,反而是金黃色葡萄球菌、表皮葡萄球菌以及溶血葡萄球菌等都遠比正常皮膚上來得多。

完成菌群分析後,研究人員接著讓患者每天使用兩次潤膚品,持續三個月後,患部濕疹嚴重分數計分平均降低百分之三十八,逾三分之一改善幅度超過百分之七十五;原本異常增加的三大類葡萄球菌也明顯減少,菌群分布狀況變得與鄰近處正常皮膚類似。

但究竟是因為潤膚品提供油脂,讓原本缺損的皮膚屏障正常化、改變菌群分布?還是潤膚品中的硒以及其他益生菌、益生質,影響菌群分布?還需要進一步研究。不過,研究人員認為,藉由此一研究可知,皮膚上的菌群分布情況或可用來判斷皮膚健康與否,甚至藉以及早偵測皮膚的微小變化,提早預防皮膚出現發炎反應。

(自由時報記者洪素卿)

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