Acupuncture treatment for insomnia based on the microbiome-gut-brain axis theory: A review

Insomnia, a prevalent sleep disorder, significantly impacts patient social function and quality of life, creating a substantial burden on individuals. This underscores the need for effective treatments. Acupuncture, an essential part of complementary and alternative medicine, has received increasing attention for its therapeutic effect on insomnia, although its mechanism is still not fully understood. In recent years, some studies have focused on the microbiome-gut-brain axis, a promising area of study that may shed light on how acupuncture alleviates insomnia. This review explores the possible mechanisms by which acupuncture therapy improves insomnia through the microbiome-gut-brain axis. These mechanisms include adjusting the types and diversity of intestinal microbiome and altering short-chain fatty acid levels, inhibiting inflammatory responses, improving the tight connection of the intestinal mucosal barrier, controlling the release and production of brain-gut peptides, and regulating the pathways associated with the hypothalamic-pituitary-adrenal axis and the vagus nerve. The findings aim to provide a more objective basis for the use of acupuncture and moxibustion in treating insomnia.