Group 1 - The article emphasizes the importance of dietary choices during the coldest period of the year, particularly the "San Jiu" days following the winter solstice, which are crucial for individuals with cold body constitutions [1] - It suggests consuming foods and traditional Chinese medicine that nourish kidney essence, such as black foods, Tai Zi Shen, or Western ginseng, to achieve the goal of nourishing yin and strengthening yang [1]

Core Viewpoint - The article emphasizes the importance of traditional Chinese medicine practices during the coldest days of winter, particularly focusing on dietary and herbal remedies to strengthen the body and prevent winter-related ailments [1] Group 1: Health Practices - The period after the winter solstice, particularly the "three nine days," is identified as the coldest time of the year, which can exacerbate health issues for individuals with cold constitutions [1] - Common ailments during this period include respiratory diseases, neck and back pain, and menstrual discomfort, highlighting the need for preventive measures [1] Group 2: Dietary Recommendations - The article suggests consuming foods and herbs that nourish kidney essence, such as black foods, Tai Zi Shen, or Western ginseng, to achieve the goal of nourishing yin and strengthening yang [1]