With the acceleration of population aging, the problem of functional constipation has become increasingly prominent, significantly affecting the quality of life of the elderly. Currently, there are numerous studies focusing on the pathogenesis of and nutritional interventions in functional constipation in the elderly population. However, systematic reviews are lacking. Therefore, this paper focuses on discussing the correlation between gut microbial metabolites and the occurrence of functional constipation, and presents a systematic summary and classification of the raw materials that have been approved for use in health foods for moistening the intestine and promoting defecation. Furthermore, their mechanisms of action in alleviating constipation are discussed. This review is expected to provide enlightenment and assistance for the research and development of functional foods against functional constipation in the elderly
