The scientific journal Frontiers in Immunology has published a paper by five researchers from various academic institutions that shows how Taijiquan (Tai Chi) and other mind-body interventions can help reduce inflammation. The health effects achieved are marked by specific molecules found inside cells. These molecules emulate gene expression, favouring inflammation response. In the groups that practice mind-body exercises such as Taijiquan (Tai Chi), a significant decrease in the presence of that molecule was found.
The article conclusion says:
The results of 18 studies that used gene expression analysis in research on meditation and related MBIs have overall found downregulation of NF-κB-targeted genes, which can be understood as the reversal of the molecular signature of the effects of chronic stress. Even though the study designs, the population, and the types of MBI used in the studies included in this review vary, it indicates that some of the psychological and physical benefits of MBIs are underpinned by biological changes in NF-κB genes.
The original paper refers broadly to MBI, mind-body interventions. The authors include in this category not only Taijiquan (Tai Chi), but also Meditation, Mindfulness training, and Yoga. We would say that Qigong is also to be included.