简述：新陈代谢是生物体基础的生理活动，头发亦如此，没有头发的脱落就没有头发的生长，所以面对头发脱落并不要沮丧。不注意保持头发卫生容易滋生真菌引起头皮的健康问题，洗头可以除去脱落的头发从而刺激新发生长，但需要依据自身情况，出汗与运动要洗头洗澡，但过于频繁的洗头，反而破坏了平衡，会让头发变得干燥。所以最好的护理就是平衡，保持头发健康而浓密，干净而光泽。
整理：2023年11月27日于北城家园
What Does Your Hair Actually Need?
A marker of beauty, pride, health —today our hair takes center stage in our formation of identity, and it's always been a part of what makes us human.
头发是美丽、自信和健康的标志--如今，头发在我们形成身份认同的过程中占据着重要位置，头发也一直是我们人类的一部分。
Hair is composed of a shaft, the visible part, and the root, which connects to the skin. The root is surrounded by a sheath called a hair follicle below the skin, which promotes hair growth.
头发由发干（可见部分）和发根（连接皮肤的部分）组成。发根被皮肤下称为毛囊的鞘包围着，毛囊能促进头发生长。
Scalp hair goes through three phases: a growing phase, a transition phase, and the last phase, when it falls out.
头皮头发会经历三个阶段：生长阶段、过渡阶段和最后的脱落阶段。
"In order to grow hair, we need to lose hair," explains Shilpi Kheterpal, an assistant professor of dermatology at the Cleveland Clinic.
克利夫兰诊所皮肤学助理教授希尔皮·克特帕尔解释说：“为了长头发，我们需要脱发。”
The idea of healthy hair is a bit tricky and not easy to define. Oma Agbai, an associate clinical professor of dermatology at the University of California, Davis School of Medicine, sees thickness, length, shine, and strength as signs of healthy hair. Beyond excessive shedding, other signs of poor hair health can include thin-appearing hair with visible scalp, dull hair, and damaged hair with split ends.
健康头发的概念有点棘手，难以界定。加州大学戴维斯医学院皮肤科临床副教授Oma Agbai认为头发的厚度、长度、光泽和强度是健康头发的标志。除了过度脱落外，头发健康状况不佳的其他迹象还包括头发稀疏，可见头皮，头发没有光泽，头发分叉受损。
What does your hair actually need? It might surprise you to learn nothing is actually needed to care for your hair, though regular washing is important.
你的头发到底需要什么呢?你可能会惊讶地发现，尽管定期洗头很重要，但护理头发实际上不需要任何东西。
Regular washing "allows you to have optimal moisturization and the appearance you want to have."Washing does more than clean. It helps the hair get rid of the dead hairs which can stimulate new growth. Our follicles are attached to sebaceous glands, which make oil called sebum to add moisture to the hair. If people with straight hair don't wash it frequently, the sebum can build and attract fungus. This can cause inflammation and potentially, dandruff.
定期清洗“可以让你获得最佳的保湿效果和你想要的外观。”洗头不仅仅是为了清洁。它可以帮助头发去除死毛，从而刺激新的头发生长。我们的毛囊附着在皮脂腺上，皮脂腺分泌一种叫做皮脂的油脂，为头发补充水分。如果直发的人不经常洗头，皮脂会积聚并吸引真菌。这可能会引起炎症，甚至可能引发头皮屑。
If you have itching, flaking, rashes in the scalp. It may be a sign you may need to wash more frequently. Still, too much washing can dry out the hair.
如果你头皮发痒，脱皮，发疹。这可能说明你需要经常洗头。不过，洗得太多会使头发变干。
People who produce less sebum can get away with showering less. People who sweat a lot and or exercise frequently should wash their hair accordingly–– showering after working out or producing excessive sweat.
皮脂分泌较少的人可以少洗澡。经常出汗或经常锻炼的人应该适当地洗头——在锻炼或出汗过多后洗澡。
It's all about balance. You want to make sure you're washing your hair and taking care of it but not overdoing it.
这都是为了达到平衡。你要确保你洗了头发，护理好头发，但又不能过度。
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