New research from the University of Colorado’s medical school has highlighted the profound positive impact of dietary interventions on the gut microbiome and its influence on gene regulation and overall health.
Both intermittent fasting and calorie-reduction diets have been found to have beneficial effects on the microbiome, the complex community of bacteria residing in the human digestive system and throughout the body.
In the study, published in the journal Nutrients, participants, all of whom were either overweight or obese, were given one of two instructions: to follow a regimen of fasting for three non-consecutive days per week for a year or to reduce their daily caloric intake by approximately 34% over the same period.
Remarkably, after just three months into the year-long study, researchers observed significant improvements in the diversity of gut bacteria in both groups, whether they practised intermittent fasting or reduced their daily calorie intake.
This analysis suggests that individuals can enhance the diversity of their microbiome and potentially improve their overall health by adopting a weight-reduction strategy of their choice.
The new study reinforces the concept that changes in gut bacteria are intricately linked to weight loss. Researchers identified numerous connections between the abundance of microbes associated with metabolism and obesity and DNA methylation, a process that alters gene regulation and potentially affects health outcomes.
The Significance of Microbial Diversity for Health
Inside the human body reside around 100 trillion symbiotic microbial cells, the majority of which are bacteria, predominantly inhabiting the upper and lower intestines. Although our understanding of these microorganisms is still in its infancy, it is evident that they play pivotal roles in influencing our health.
Quoted in Medical News Today, uninvolved Gastroenterologist Dr. Rudolph Bedford, explained, “The gut microbiome mediates so many different things. For instance, it mediates any type of inflammatory process going on within your body.”
Inflammation in the body has been linked to a range of medical conditions, including cancer, diabetes, dementia, and heart disease.
Furthermore, the microbes within the microbiome impact various bodily processes, including appetite and obesity.
Dr. Bedford elaborates, “You want a very diverse microbiome because the more diversity you have, the better variety of function in various aspects of your body you will have. You want a very diverse microbiome to decrease and regulate all the mechanisms within your body.”
Research consistently demonstrates the value of a diverse microbiome. Dietician Kristin Kirkpatrick, who was also not part of the study, adds, “Microbial diversity has been associated with a better microbiome. Studies have shown that healthy individuals often have a more diverse gut microbiota. We also see in the data that the greater the beneficial microbes, the greater the chance of beneficial health outcomes.”
Why Fasting and Calorie Reduction Enhance Microbial Diversity:
Following their earlier analysis, the researchers suggested that the observed benefits could be attributed to changes in metabolism, weight loss, cardiometabolic factors, or improvements in dietary patterns resulting from the two intervention methods.
Dr. Bedford offers a simpler explanation: “The microbiome is working full-time. So when you fast or eat less, you rest it, allowing it to repopulate, just like sleep. That’s certainly one of the theories as to why you’re improving diversity with intermittent fasting, among other methods.”
However, Kirkpatrick warns that there’s no one-size-fits-all approach to diet, and each individual’s diet should be assessed with a healthcare professional.
She also advises, “Pregnant women, breastfeeding individuals, or those struggling with a chronic condition should consult their doctor or dietitian before making any dietary changes.”
Kirkpatrick expresses concern that fasting diets and extreme calorie reduction might pose risks to individuals with a history of disordered eating.
“Individuals with a history of eating disorders or current disordered eating should also not consider fasting or low-calorie approaches,” warns Kirkpatrick.
