Your gut microbiome doesn’t just care about what you eat – it cares about how often you eat it.
Most of us know we should eat more fruits and vegetables, cut back on junk food, and stay hydrated. That’s basic nutrition. But a new study is shaking up that familiar advice.
It turns out that even the healthiest foods won’t help much if you don’t eat them consistently.
Food consistency for gut health
Your gut microbiome – the tiny microbes living in your digestive system – care a lot about consistency. And if you’re only eating healthy food once in a while, you may not be doing your gut any favors.
This is the first time researchers have been able to prove how important regularity is when it comes to diet and gut health.
The study was conducted by a team at EPFL (École Polytechnique Fédérale de Lausanne) and their collaborators at the University of California, San Diego.
Why your gut microbiome matters
Your gut microbiome is like a bustling neighborhood of bacteria, viruses, and fungi living inside your digestive system. Some of them help break down food, fight off bad germs, and even support your immune system. Others are not so helpful.
Scientists already knew that eating lots of fruits, vegetables, whole grains, and nuts could lead to a more diverse and healthier gut microbiome. That’s been shown in dozens of past studies.
But this new research has revealed that it’s not enough to eat well once in a while.
Irregular consumption of healthy foods
Professor Marcel Salathé is head of the Digital Epidemiology Lab and co-director of the EPFL AI Center.
“This research clearly shows that you cannot binge on vegetables on your healthy day and then eat in an unhealthy way for the rest of the week or month,” said Professor Salathé.
“In fact, our study suggests that irregular consumption of healthy foods undoes many of the beneficial effects on the gut microbiota. This is a real incentive for future studies to not just look at what people are eating but the patterns of what they are eating over time.”
In other words, your gut likes routine. Feeding it broccoli only once a week doesn’t make up for six days of fast food and soda.
Challenge of understanding diets
In a surprising part of the study, the researchers found that your gut microbiome can reveal a lot about what you’ve been eating – and vice versa. With just a stool sample, they could predict a person’s diet with up to 85% accuracy using AI.
“For our collaborators in San Diego, who are some of the world’s leading experts in gut microbiome research, this was exciting,” said Professor Salathé.
“Getting such data from a stool sample is relatively easy, but understanding someone’s diet is notoriously difficult, it’s data that’s been challenging to collect.”
It’s hard to track what people eat over days, weeks, or months. Most past studies relied on people trying to remember what they ate, which isn’t always accurate. This research took a different route.