
Stephanie J. Culler
Author
11
APPEARANCES
11
PODCASTS
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Sep 13, 2026
Your Baby’s Gut Is Talking to Their Brain: The Surprising Connection Between Gut Health & Emotional Development with Dr. Stephanie Culler Ep. 148
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Anne AlvarezHOST
Cause you don't think about it, but as both a scientist and a mom, What surprised you most about the importance of the first thousand days? And what do you wish every parent knew?

Stephanie CullerGUEST
And so we found out that essentially there's a modern crisis kind of happening with the baby gut.

Stephanie CullerGUEST
So practices like antibiotics or C-sections, infant formula, poor diet are leading to young children, babies specifically not getting the right bacteria they need early on.

Stephanie CullerGUEST
And so to better understand that, to do research, to maybe help put those right bacteria back, we conducted the My Baby Biome Study, which is the largest study ever in the US to map the baby biome.

Stephanie CullerGUEST
And we found out that about nine out of 10 US babies are missing one or more of these key bacteria.
6 MINS LATER

Anne AlvarezHOST
Like, are you suggesting that parents get a probiotic for their infants? Like, Just the liquid kind or? So
299: The Infant Microbiome Crisis That's Setting Your Kids Up To Have Chronic Disease - with Stephanie Culler
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10:56Josh DechHOST
My wheels are spinning and I just, can you walk us through why that is so catastrophic? Like the fundamentals of a microbiome, what they're made of, where they're coming from and why there's a 0% detectable is so bloody catastrophic.

Stephanie CullerGUEST
The infant microbiome and all of the human microbiomes around the world really get started with Bifidobacterium, the key species that thrive in the presence of prebiotics and breast milk called human milk oligosaccharides.

Stephanie CullerGUEST
These are really powerful prebiotics that are essentially the third largest component of breast milk.
9 in 10 Babies Are Missing Key Gut Bacteria featuring Researcher and CEO Dr. Stephanie Culler
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4:30speaker_3HOST
And start changing the microbiome, can that change the trajectory? Even with oral desensitization or sublingual desensitization, can just doing that and where the diet plays, etc.? ?

Stephanie CullerGUEST
So our research is really focused on trying to understand what's happening in the microbiome of babies today and the key loss of critical bacterial called bifidobacteria.

Stephanie CullerGUEST
So we launched the My Baby Biome Study, which is, as you mentioned, the largest study ever in the U.S. to look at the baby biome.

Stephanie CullerGUEST
And, you know, what we found was, yes, 9 out of 10 U.S. babies are missing one or more key bifidobacterium.

Stephanie CullerGUEST
And why this is really important is that by age 2, we saw that majority of these babies with either low amounts or none of these key bacteria, by age 2, they were 3 to 4 times more at risk for developing atopic dermatitis, food allergies, and asthma.
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That's
What 9/10 Kids Are Missing | UnMuted Love Ep.107
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Ce EshelmanHOST
What would a new parent experience in a child who had all the negative front end things that we talked about? What might they be experiencing so they would even know?

Stephanie CullerGUEST
Yeah, I think there's both, you know, conditions, disease conditions, but also acute things that may come up.

Stephanie CullerGUEST
So what we see from the research, not just our My Baby Biome study, which is the largest in the U.S. to look at the infant microbiome and its development, but also global studies, is that babies who are essentially missing these key bifidobacteria or low amounts, they tend to be about three to four times more at risk of developing these atopic conditions I mentioned, the eczema, the food allergies, asthma.

Stephanie CullerGUEST
But some things that they may just notice from day to day, it can be their bowel movements, how regular they are, either having constipation or on the flip side, very watery, loose stools.
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The Gut Microbiome and Autism: What We’re Learning About Bifidobacteria, Immunity, and Children’s Health
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Brooke WagnerHOST
And so let's talk a little bit about that and kind of as that relates to autism, what you're seeing.

Stephanie CullerGUEST
So what our study found is that, as I mentioned, nine out of 10 U.S. babies are missing one or more key species of bifidobacterium.

Stephanie CullerGUEST
Our study found that there were three key species of bifidobacterium that are really needed for immune development, as well as suppression of of the undesirable bacteria.

Stephanie CullerGUEST
These are potential pathogens or potentially infectious organisms, some associated with disease, really undesirable microbes in the child's microbiome and for everybody pretty much.

Stephanie CullerGUEST
And so with the missing bacteria, that's why we have such a high level of undesirable bacteria, essentially.
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Brooke WagnerHOST
And so let's talk about kind of what you created in response to this data that you gathered and kind of share a little bit more about that.
What’s Going Wrong with The Infant Microbiome and Why Does it Matter? Episode 136
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Lisa PalladinoHOST
So what can parents do to either in pregnancy or the, you know, breastfeeding or if breastfeeding doesn't work, like what are our options to get bifidobacter back in our world? You know, where does it live in nature? Is it just in us? Is it in soil? Is it in animals? Like what?

Stephanie CullerGUEST
Bifidobacteria is in a variety of animals, but it really lives inside the gut.

Stephanie CullerGUEST
And these particular species that are associated for infants, as well as for us as we get older, are what we call anaerobes.

Stephanie CullerGUEST
So their environment is normally in the gut, right? In this atmosphere that you and I are talking, that's not their environment.
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Lisa PalladinoHOST
There's a couple of different companies now that make it, but you have one of them, right? Let's talk about how easy it is or is it easy to get probiotics into an infant?
28) Your Baby’s Gut Microbiome: What We’re Learning About a Healthy Start | Dr. Stephanie Culler
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1:23AmandaHOST
So would you tell us a little bit about yourself? Did you always want to be a scientist? What, what led you to this?

Stephanie CullerGUEST
Um, I've always wanted to be a scientist, but really, um, you know, losing my grandmothers to cancer when I was a young teenager inspired this personal passion to, you know, study cancer, um, but also how could we prevent disease, and that's what brought me to do my PhD at Caltech, where I focused in new gene therapies for cancer.

Stephanie CullerGUEST
And after that success, I was really excited to actually start a company, [laughs] a biotech company, to translate that research into meaning therapies.

Stephanie CullerGUEST
And so I came down to San Diego, where we're based today, and I worked in industrial biotech with microbes, like what we have in our gut.

Stephanie CullerGUEST
Um, and after commercializing a variety of products, I was ready to move on and get back to my personal passion in human health, and wanted to marry this deep technology experience with microbes, um, and how they work, their metabolism, to human health, and the microbiome seemed like the perfect fit.
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6:53AmandaHOST
Yes
The Missing Microbes: Why Today's Babies Need Yesterday's Microbiome
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Rob SilvermanHOST
Could you expand upon that? 'Cause people are like, "Well, I'm taking this great probiotic from CVS," versus this.

Stephanie CullerGUEST
So what we put in can really take hold, but it, they have to be thought of as pairs, you know, that they work together.

Rob SilvermanHOST
Could you talk a little bit about what you did in your test and how you got your data?
Episode 18: Building a Resilient Immune System- The Groundbreaking Science Behind the Infant Gut Microbiome
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4:20speaker_0HOST
Mm

Stephanie CullerGUEST
when I was a young teenager, and it inspired a per- personal passion in cancer research, but also how to prevent it.

Stephanie CullerGUEST
And that was the work that I did at Caltech, was really focused in developing new cancer gene therapies.

Stephanie CullerGUEST
And when I started our company, Persephone, actually nine years ago, for the fi- first five years, I was only working in cancer research, trying to fix the microbiome of cancer patients, because if they have a healthier microbiome, given most of their immune system's in the gut, they might have an opportunity to respond better to cancer drugs.

Stephanie CullerGUEST
Could we get more cures, more durable responses? And that was, that was really my focus.

Stephanie CullerGUEST
And then I had my daughter, and about six months in, um, and well-known pediatric scientist had come to me, and this is during COVID.
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So how can moms sort of think about this first 1,000 days, think about the microbiome that they need to have their baby exposed to in a sense of empowering and not just, like, anxiety or not feelings like, "Oh my gosh, I've already messed this up"?
Ep. 122: Generational Health: 9 Out of 10 Babies Are Missing Key Gut Bacteria, with Dr. Stephanie Culler or Persephone
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24:19Heather FinleyHOST
So walk us through that and why this is so important because probiotics need fuel themselves.

Stephanie CullerGUEST
And that's probably why it's one of the reasons that a lot of probiotics will fail is that lack.

Stephanie CullerGUEST
And what's really special and very unique to the infant gut is that these bifidobacterium strains The match for them, their food match are human milk oligosaccharides from breast milk.
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607. [INTERVIEW] Infant & Toddler Gut Microbiome: How to Best Support It & Its Connection to Lifelong Health Outcomes with Dr. Stephanie Culler
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Stephanie CullerGUEST
... um, when I was a young teenager, and inspired me to become a scientist.

Stephanie CullerGUEST
Uh, did my PhD at Caltech focused in cancer research, and always wanted to be an entrepreneur, so after Caltech, uh, jumped, jumped into industry, learned a lot, um, about bacteria, like what's in our gut, [laughs] um, at a company, and decided I wanted to start a company in the microbiome space to marry this personal passion, um, for human health, um, and, and microbes, like what we have in our gut, and focused in cancer there, but now focused on the baby biome.

Stephanie CullerGUEST
So if we could make it healthier by introducing new microbes, um, could we improve their response to treatment? And along that way, I had my daughter, who's now five, and when she was six months old, this is during COVID, [laughs] sitting off camera, I had a conversation with a well-known pediatric scientist who came to me and said, "You know, you're fixing the microbiome of cancer patients so maybe they can respond better to treatment.