Summary
Professors Nicola Segata and Sarah Berry present findings from a landmark Nature study identifying roughly 50 gut bacteria consistently linked to lower body fat, reduced inflammation, and improved cholesterol. They explain the stark divide between microbes associated with health versus those tied to obesity and cardiometabolic risk, and outline dietary changes that can shift the balance toward a healthier microbiome.
Key Points
- A Nature study identified ~50 gut bacteria consistently linked to lower body fat, reduced inflammation, and better cholesterol profiles.
- "Good" gut bacteria thrive on dietary fiber and polyphenols from diverse plant foods -- 30+ different plants per week is the target.
- "Bad" gut microbes associated with obesity and cardiometabolic risk flourish on ultra-processed foods and low-fiber diets.
- Fermented foods (yogurt, kefir, kimchi) can shift the microbiome toward a healthier composition within weeks of regular consumption.
- The microbiome responds to dietary changes within days, meaning you can measurably improve your gut bacteria profile relatively quickly.
- Microbiome composition is a stronger predictor of metabolic health markers than genetics alone for most people.
Key Moments
Now you helped to explain I think the good bugs
There is still 5, 10, 15 percent of our gut microbiomes that are really unknown, so still to be discovered even by metagenomics. Now you helped to explain I think the good bugs.
"There is still 5, 10, 15 percent of our gut microbiomes that are really unknown, so still to be discovered even by metagenomics. Now you helped to explain I think the good bugs. We don't understand completely, but you're saying they break down these fibers and they make these sort of positive chemicals. What about a bad micro? What's that doing? They are more inflammatory associated with simple sugars that are present in many foods."
And especially the good ones are a lot unknown
I say that we don't know very well also because inside our top 50 microbes, there are some microbes that no one saw before us. So we define them, we saw them, but no microbiologists before us was able to have them growing in vitro.
"I say that we don't know very well also because inside our top 50 microbes, there are some microbes that no one saw before us. So we define them, we saw them, but no microbiologists before us was able to have them growing in vitro. So they never seen this bacteria, but we saw them directly using these techniques called metagenomics in the samples. And especially the good ones are a lot unknown."
Zone 2 Cardio: And it's also only been possible thanks to more
And I think many of those members will be listening today, in which case I'd like to say thank you, to all of you for being part of this, and I suspect Nicola and Sarah will be the same.
"and it's also only been possible thanks to more than 34,000 Zoe members who took part in this research. And I think many of those members will be listening today, in which case I'd like to say thank you, to all of you for being part of this, and I suspect Nicola and Sarah will be the same. Absolutely. Thank you so much."
And I'm delighted to have two of the senior authors with me today
This research has just been published in Nature, the world's most influential scientific journal. And I'm delighted to have two of the senior authors with me today.
"This research has just been published in Nature, the world's most influential scientific journal. And I'm delighted to have two of the senior authors with me today. Professor Nicola Sugata from the University of Trenton and Professor Sarah Berry. Zoe's chief scientist and professor of nutrition at King's College London."
