Transcript: Jeroen Raes on The Gut Flora: You and Your 100 Trillion Friends at TEDxBrussels

Jeroen Raes

Here is the full transcript of researcher and bionaut, Jeroen Raes’ TEDx Talk titled “The Gut Flora: You and Your 100 Trillion Friends” at TEDxBrussels.

Listen to the MP3 Audio here: The gut flora- You and your 100 trillion friends- Jeroen Raes at TEDxBrussels


So you think you are human. There are 7 billion people on this planet. You know how many microbes there are? 5 nonillion. 5 nonillion! That’s the number of stars in the universe multiplied by 5 million. That’s a lot of bacteria.

And they are everywhere. They are on this floor, they are in your kitchen sink, they are on your chair, they are on your coffee cup. And yes, they are on you. You harbor 100 trillion bacteria in and on your body right now. That’s only a thousand times the number of individuals on this planet.

And if you look at it in terms of cells, you are outnumbered ten to one. You are not human. You are a walking bacterial colony.

We have several commensal floras, or commensal microbiotas, as we call them. You have your skin flora, your oral flora, your genital flora, and most famously, your gut flora. And these floras are numerous, but they are good for you. They help you digest your food, they protect you against pathogens, they provide you with essential nutrients such as vitamins. They train your immune system and most importantly, if something goes wrong with your flora, something is wrong with you.

So we scientists, in the last few years, we’ve discovered new techniques to study the gut flora or the gut microbiome at great resolution. So we start off from a sample from your flora, we extract all the microbes. We extract all the DNA from these microbes. We throw that into one of those sequencing devices and we learn something about that ecosystem, because it’s an ecosystem. We learn what microbes live there and we learn what these microbes can do, what genes they have in their collective genome.

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And we’ve learned that our microbiome, so the collective genome, contains 100 times more genes than we have. We have a second genome active in and on our bodies. And we’ve learned that you can sort of classify the gut flora into 3 kinds, 3 corners of ecosystem space, and we’ve called them enterotypes.

And so to give you a better feeling of what these enterotypes are I often make the — what’s the word? — the comparison, thank you, with an ecosystem, right, with a forest. You have tropical forest, you have temperate forest, you have bamboo forest. They are all forests. But you have different species living together and functioning as a unit. You have constellations that work optimally, and that’s what I think these constellations in your gut flora are like.

And so the environment that these bacteria live in, they determine these constellations, it seems. And the environment in the gut is the food that you eat. And so people have discovered that the people that have more fat in their food, or more protein in their food or more carbohydrate in their food, they have different gut compositions. And that’s important, because more and more diseases are linked to disturbances of your gut flora. Diarrhea, diabetes, obesity, atherosclerosis, colitis, Crohn’s disease, even autism, all have been associated with disturbed gut floras. And it’s not merely associations.

Bad gut floras can actually cause disease. If you take the flora of an obese mouse and you put it into a germ free mouse, so one that doesn’t have a flora, that germ free mouse becomes obese. So we are thinking, right, we can learn something from this flora about your personal health. We are moving towards diagnosing people on the contents of your gut. And so this is being done, for example, for diabetes, or for colon cancer.

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