長粉刺其實跟個人飲食習慣有關，這篇文章中的一些最新研究告訴我們經常吃含糖類較多的食物如白面包、甜點等會導致皮膚粗糙和粉刺嚴重。建議大家日常飲食少吃些高血糖指數的食物，為了能擁有光滑白嫩的皮膚，多吃魚類、水果等低血糖指數食物。

    Sugar in the Diet Can Lead to Acne

    Any link between sugar and acne has long been dismissed. But now scientists are taking another look.

    In recent years, studies have shown that what matters may not be sugar itself but a food’s glycemic index, or the speed and extent to which it raises blood glucose levels. Foods that have a high glycemic index — and as a result raise glucose levels rapidly — cause the body to release a flood of insulin and other hormones, which some scientists suspect can stimulate oil production and inflame the skin.

    To test the theory, scientists recruited 50 men and boys ages 15 to 25, all of them with acne, and followed their progress for 12 weeks. Some subjects stuck to a typical diet that included high-glycemic foods like white bread, sweetened cereals and pasta, and the others were given foods higher in protein and lower on the glycemic scale, like fish, whole-grain breads and fruit.

    At the end of the study, published in 2007, the subjects on the low-glycemic diet had far greater reductions in skin lesions and other symptoms of acne than the control group. They also showed reductions in their levels of free, circulating androgens, the male hormones known to cause acne, suggesting that hormones played a role.

    Other studies have found similar connections between high-glycemic foods and acne, though scientists say more research is needed.

    日常飲食中的糖類可能導致長粉刺

    在很長一段時間內，糖類和粉刺之間的關系一直被忽略。不過，現在科學家們對兩者的關系有了另外的看法。

    近幾年，一些研究表明，真正引起血液中葡萄糖升高的原因或許不是糖類本身，而是食物的血糖指數、血糖的擴散速度和擴散范圍。高血糖指數的食物能使葡萄糖快速增加，引起體內釋放大量胰島素和其他荷爾蒙，科學家們認為這些激素刺激了油脂的分泌和皮膚發炎。

    為了證明這個理論，科學家們征募了50個15~20歲的成年男子和男孩，他們都長粉刺。在接下來的12個星期，他們中有的人按典型的飲食習慣一直吃高血糖指數的食物，如白面包、甜谷物類和甜面條等，其他人吃高蛋白和低血糖指數的食物，如魚，全麥面包和水果。

    研究結果在2007年發表，堅持低血糖飲食的被試者皮膚明顯變好，臉上的粉刺比另一組被試者少得多。同時，他們的男性荷爾蒙釋放量和循環量也明顯減少。男性荷爾蒙是引起粉刺的其中一個原因。

    在高血糖指數食物與粉刺關系的其他研究中，有類似的發現，盡管科學家們認為這方面的更多研究是必須的。