Intermittent fasting - a potential approach to modulate the gut microbiota in humans? A systematic review

Research on gut microbiota has increased in popularity over the past decade, with evidence associating different dietary habits with changes in the makeup of the rich ecosystem of microorganisms that performs a variety of functions and induces a range of health effects, within and well beyond the gastrointestinal tract. Similarly, intermittent fasting (IF), an umbrella term describing various regimens of periods of voluntary abstinence from food and drink, has classically been associated with favourable impacts on cardiovascular risk factors, body weight, circadian biology, and, more recently, the gut health..The objective of this PRISMA systematic review was to summarize the peer-reviewed literature of clinical trials related to the impact of IF regimens on the gut microbiota. A MEDLINE search was conducted using PubMed and the keywords “intermittent fasting”, “gut microbiota”, “microbes”, and others. Whilst the field is still in its infancy, an emerging body of evidence suggests beneficial effects of IF on the health of the gut through increasing the microbial diversity and abundance, with possible clinical implications related to improving the immune function and ameliorating the metabolic status. Further research in larger clinical trials is warranted before practical recommendations for the public health can be made.