Here are a few options for the description of the WordPress post tag “新陳代謝” (Xīnchén dàixie, Metabolism) in Traditional Chinese, catering to different levels of detail and formality:

**Option 1: Concise & Clear**

> 身體內將老舊細胞轉換為新細胞的過程，攸關健康及能量。 (Shēntǐ nèi jiāng lǎo jiù xìbāo zhuǎnhuàn wéi xīn xìbāo de guòchéng, yōuguān jiànkāng jí néngliàng.)
> _Translation: The process within the body of converting old cells into new ones, vital for health and energy._

**Option 2: Slightly More Informative**

> 指身體內進行的生化反應，將食物轉化為能量及其他物質，並將廢物排出。影響健康、體重及整體功能。 (Zhǐ shēntǐ nèi jìnxíng de shēnghuā fǎnyìng, jiāng shíwù zhuǎnhuà wèi néngliàng jí qítā wùzhí, bìng jiāng fèiwù páichū. Yǐngxiǎng jiànkāng, tǐzhòng jí zhěngtǐ gōngnéng.)
> _Translation: Refers to the biochemical reactions within the body that convert food into energy and other substances, and eliminate waste. Affects health, weight, and overall function._

**Option 3: Focusing on Relevance (Useful for Health/Wellness blogs)**

> 討論關於新陳代謝的各種面向，包括如何加速新陳代謝、影響因素，以及與飲食、運動和健康生活的關聯。 (Tǎolùn guānyú xīnchén dàixie de gèzhǒng miànxiàng, bāokuò rúhé jiāsù xīnchén dàixie, yǐngxiǎng yīnsù, yǐjí yǔ yǐnshí, yùndòng hé jiànkāng shēnghuó de guānlián.)
> _Translation: Discussions on various aspects of metabolism, including how to accelerate it, influencing factors, and its relationship with diet, exercise, and healthy living._

**Option 4: Short & Simple for Everyday Users**

> 了解身體能量轉換的秘密，探索如何維持健康的新陳代謝。 (Liǎojiě shēntǐ néngliàng zhuǎnhuàn de mìmì, tànsuǒ rúhé wéichí jiànkāng de xīnchén dàixie.)
> _Translation: Understand the secrets of the body’s energy conversion, and explore how to maintain a healthy metabolism._

**Tips for Choosing the Best Description:**

* **Consider your target audience:** Who are you writing for? Are they experts or general readers?
* **Think about the post’s focus:** Is the post about nutrition, exercise, disease, or lifestyle?
* **Keep it concise:** WordPress tag descriptions should be relatively brief.
* **Use relevant keywords:** This can help with SEO.

Choose the option that best suits your specific needs and the overall tone of your blog. I recommend option 2 or 3 for their informative nature. Good luck!