Here are a few description options for the WordPress post tag “營養學” (Nutritional Science) in Traditional Chinese, catering to different levels of formality and intended audience:

**Option 1: Concise & Informative (General Audience)**

* **描述 (Description):** 了解飲食與健康的科學。涵蓋食物、營養素、身體需求及健康飲食的知識。 (Learn the science of diet and health. Covers knowledge of food, nutrients, bodily needs, and healthy eating.)

**Option 2: Slightly More Detailed (Suitable for blog posts)**

* **描述 (Description):** 所有關於營養學的資訊，包括各種食物的營養成分、如何搭配飲食以達到最佳健康狀態、以及不同營養素對身體的影響。 讓你輕鬆掌握健康飲食的秘訣！(All information about nutritional science, including the nutritional composition of various foods, how to combine your diet for optimal health, and the effects of different nutrients on the body. Make it easy for you to master the secrets of healthy eating!)

**Option 3: Focus on Education (For educational content, e.g., a course)**

* **描述 (Description):** 深入探索營養學的世界，學習由淺入深的飲食知識，培養健康飲食習慣，並了解如何透過食物促進身心健康。 (Explore the world of nutritional science in depth, learn dietary knowledge from the basics, cultivate healthy eating habits, and understand how to promote physical and mental health through food.)

**Option 4: Emphasis on Modern Approach ( If discussing updated research)**
* **描述 (Description):** 最新的營養研究和實用技巧，幫助你了解不同食物的營養價值和如何搭配飲食。 讓你掌握科學的營養知識，擁有健康的飲食生活！ ( The latest nutritional research and practical tips to help you understand the nutritional value of different foods and how to combine your diet. It lets you grasp scientific nutritional knowledge and have a healthy dietary life!)

**Key Considerations when Choosing:**

* **Target Audience:** Consider who you’re writing for. Are they beginners, experts, or somewhere in between?
* **Post Content:** The description should align with the type of content you’re tagging. (e.g. if your content focuses on specific dietary needs, tailor the description to that.)
* **Keyword Integration:** Although descriptions are more for user understanding, they *can* help with search. Includes terms like ‘食物’, ‘健康飲食’, ‘營養素’ as appropriate keywords for that specific content.

**Recommendation:**

I would personally recommend **option 2** or **Option 4** as they are clear, informative, and suitable for a WordPress blog. They also cover different aspects of nutrition. You could tailor the description further to reflect your personal stance on nutrition, if you have one.

To add this in Wordpress, in the area for the tag details, you will find the filed for the description listed above. Just enter your preferred description, then save or submit.