
Karan Rajan
Doctor
15
APPEARANCES
14
PODCASTS
012
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Sep 28, 2026
Dr. Karan Rajan: Social Media Is The New Search Engine, Experts Need To Be There
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Karan RajanGUEST
Like when I first got into content, it was just, you know, so if you rewind a little bit, I started content before, you know, content was really a thing.

Karan RajanGUEST
Back when it was a weird thing to make videos and put them online, I was doing it.

Karan RajanGUEST
And now it's weird if you don't make videos, right? So 2010 is when I started my YouTube journey and just being on screen and, you know, my content style has completely changed since then, you know, the, like those 10 years, but essentially it always starts at the same thing.

Karan RajanGUEST
Throwing things out the wall, seeing what sticks, what works for me for that platform.
Everything You Need To Know About Your Poop | Gut Surgeon Explains : 1533
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Karan RajanGUEST
It has got amazing infrared system that can detect still images of the poop, tell you about the Bristol stool scale of your poop, your size, shape, color, consistency, your toilet time, if you're straining, the evacuation time.

Karan RajanGUEST
It can also listen... to the tinkle of your pee and estimate the rate of your pee, your hydration levels based on the Euroflow, the sonography of that as well.

Karan RajanGUEST
And it tells you about your prostate health, your hydration levels and your poop.

Karan RajanGUEST
Because ultimately what people don't know is that your day-to-day poops, sure, that's important.
10 MINS LATER
Myth, Meets The GUT: What GLP-1s Actually Do (with Dr Karan Rajan)
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12:26Karan RajanGUEST
I did a random blood test and I found out I had high LDL cholesterol, which is the bad cholesterol.
K
12:32Karan RajanGUEST
And several months later, I also had an ultrasound scan, which suggested that because of my high cholesterol, likely I had mild fatty liver disease.
K
12:44Karan RajanGUEST
And I worked with a dietician to kind of get to the cause of some of this stuff.
9 MINS LATER

Marc McKeeHOST
What's the conversation people on this journey should be having that they're not?
Dr Karan Rajan: Lessons In The Simple Health Habits Everyone Should Know
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22:33IsabellaHOST
How much do you know about women's hormones, and do you have any advice to women about hormone replacement therapy?

Karan RajanGUEST
Yeah, I mean, I, I would caveat this by saying I'm not obviously like, um, you know, a women's health expert or a hormone expert, but you know, hormones is a pretty wide-reaching category, and we know that they have significant impacts in so many organ systems, you know.

Karan RajanGUEST
And you mentioned a couple of life stages there, specifically looking at, you know, menopause, perimenopause, pregnancy, breastfeeding.

Karan RajanGUEST
And when I say metabolic health, I mean your changing hormones don't just impact how you feel, for example, things like brain fog or low energy, but it can actually impact body systems which you may not suspect, like your cardiovascular system.

Karan RajanGUEST
For example, in perimenopause, rates of cardiovascular disease risk go up because the fluctuating and then eventual drop-off in estrogen, which is cardioprotective and protects the heart, can actually make someone more susceptible to high cholesterol, insulin resistance, cardiovascular disease.
10 MINS LATER
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33:42IsabellaHOST
So what, what's the best way of taking, of supplementing ourselves? Is it through powders, liquids, gel, pills? Like, you know, I've heard people say, "Oh, if you're taking a number of different supplements and they're all a different kind of gel-coated liquid, that's not actually very good for your gut." Is it better to take it in a sort of pipette liquid that goes into your water? What's your advice?
Gut Health Expert: The Science of Fiber, Microbiome & Longevity | Dr. Karan Rajan
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Karan RajanGUEST
So, uh, if we go on the spectrum of the biotics, you've got prebiotics, which is the basic fertilizer for life in your colon, so it nourishes your soil.

Karan RajanGUEST
If you think of your garden as your gut, your gut is a garden, there's two ways via which you could have a nice-looking garden.

Karan RajanGUEST
You could either just keep buying more plants and flowers and plant them there.

Karan RajanGUEST
That would be the probiotics, like adding probiotic supplements, and that's not really sustainable, and it's quite expensive to keep doing that.

Karan RajanGUEST
Or you could do a more sustainable and cheaper way, and that's more eco-friendly, which is nourish the soil that's already there and fertilize that soil with the prebiotics.
36 MINS LATER
7 Health benefits of fibremaxxing and how to build a high fibre diet | Dr Karan Rajan
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8:57Karan RajanGUEST
... and then it's dissolved into bile, which is then released into the colon, and then that is excreted.
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9:03Karan RajanGUEST
Some of the estrogen, it is reabsorbed by the colon and goes back into systemic circulation via the portal vein, and it's recirculated.
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9:13Karan RajanGUEST
We don't sometimes want all of that estrogen to be reabsorbed back into systemic circulation, because then you can have a s- higher amount of estrogen in the bloodstream.
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9:21Karan RajanGUEST
The role of fiber, especially soluble fiber, that can increase GI speed, so the sort of, it reduces GI transit time, so more of that can be shoved away.
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9:32Karan RajanGUEST
So if you've got a shorter GI transit time, there's less time for that estrogen to be reabsorbed in the colon lining.
44 MINS LATER
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53:54Karan RajanGUEST
Or they were just formulated by some random hack who'd either done a ChatGPT formulation or some manufacturer's just-... churn something together, copycat things, right? And I started buying different fibers that I was using that had high quality, and it was like almost doing, like, a kitchen experiment, like dosing and weighing out in a scale different fibers, and then mixing it in a powder, blending it, and I had the thing.
High Protein Low Fiber — The Most Damaging Gut Combination | ft. Dr. Karan Rajan HTS #485
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38:44Karan RajanGUEST
It's about the fermentation propyle- uh, the fermentation profile, the viscosity, um, where it actually ferments in the colon, the actual geographical anatomical location.
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38:55Karan RajanGUEST
I like to think about fibers as, uh, you know, still simple, but it's a better way of thinking about it, as fast-fermenting, medium-fermenting, and slow-fermenting fibers.
K
39:05Karan RajanGUEST
An example would be, like, apples contain fibers which ferment in the first part of the colon, so here, the ascending colon.
15 MINS LATER
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Is there anything else about the gut microbiome that I'm missing that is really important to you?
Top Surgeon: This “Healthy” Protein Habit Is Raising Your Cancer Risk—Here's The Quick Fix
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5:14Liz MoodyHOST
And if somebody is struggling to lose weight or feel satiated when they're just focusing on these plant-based proteins and not protein maxing, what would you say to them?

Karan RajanGUEST
We have recent evidence to suggest that plant proteins are not inferior to animal proteins for muscle synthesis.

Karan RajanGUEST
Most people who are trying to live a healthy life will diversify their plant protein sources so they'll get plenty of all the amino acids and they get plenty of stimulus for muscle protein synthesis, and that's not a problem at all.

Karan RajanGUEST
And protein is satiating, it's one of the most satiating macronutrients you can get, and fiber is as well.

Karan RajanGUEST
The problem is in animal proteins, you don't get fiber, but with plant proteins, you get fiber and protein and other antioxidants.
5 MINS LATER
Ranking Gut Health Advice From Social Media (with Dr. Karan Rajan)
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25:29Liz MoodyHOST
Was any of the science she was sharing that, was it partially true? Was it completely untrue?

Karan RajanGUEST
And until I see consistent randomized controlled trial evidence for colostrum having mechanistic effects and also... real world clinical outcomes in a large data set, as we do see with fiber over decades.

Karan RajanGUEST
You know, this is the sort of like path that I will take based on the science that we have right now.
11 MINS LATER
Bloating, SIBO + Leaky Gut: What’s Actually Causing Your Symptoms (And How to Fix It) with Dr. Karan Rajan
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Arielle LorreHOST
But it seems like our generation, I think we're a similar age, and a little bit younger especially, are, like, experiencing these at really high levels.

Karan RajanGUEST
Yeah, I think there are, you can say, microbiome disruptors, and I think the number one thing would be now more than ever, there is a pretty wide...Deficiency in fiber that we consume in our diets compared to our ancestors.

Karan RajanGUEST
You know, if you look at some populations around the world that are consuming over 100 grams of fiber a day, certain tribal populations in Africa like the Hadza tribe.

Karan RajanGUEST
But we're consuming on average, you know, in the US and the UK and Europe, 15 grams of fiber or less is the average, right? And that is very detrimental to the microbiome because it's causing a slow but steady extinction of the microbiome.

Karan RajanGUEST
Now we know that via the gut-lung axis, the lung exposure and environmental exposure to various toxins and pollutants can have an impact on the lung, which can have an impact on the microbiome.
31 MINS LATER
Gut Expert: Eating THIS Everyday Protects The Gut from Diseases | Dr Karan
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Karan RajanGUEST
Yeah, so I like to think of your gut as a garden, right? And if you want to maintain that garden and make it look pretty, there's multiple routes you can go down.

Karan RajanGUEST
You can just keep buying more plants, i.e. probiotics, and just throwing them in there.

Karan RajanGUEST
But a more sustainable and better option is to nourish the soil of that garden, the lining of the colon, and the seeds of life which are already in your garden, your natural microbes.
28 MINS LATER
Dr. Karan Rajan On The Truth About Gut Health, & The Rise of Colorectal Cancer
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12:42Karan RajanGUEST
They're eating, like, the sort of roots and tubers, like cassava, beans, wheat, corn, things like that.
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12:49Karan RajanGUEST
And the reason those kind of fibers are really important, and it's come out of a lot of our modern diets, is because they ferment really slowly.
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12:58Karan RajanGUEST
If you think of your colon, right, you have your colon, which goes up here, that's the first part of the colon, and then the second part goes across, the transverse colon, third part goes down, the descending colon.
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13:08Karan RajanGUEST
The foods we eat, which are fiber-rich in the modern diet, right, like apples, that's a fast-fermenting type of fiber, and that ferments here, but it doesn't make it all the way here.
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13:20Karan RajanGUEST
The bacteria which live here are the most beneficial bacteria, and the m- the greatest number of bacteria live here.
35 MINS LATER
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Get it while it's hot at shopskinnyconfidential.com. That's shopskinnyconfidential.com. [upbeat music] Out of all the content that you have done, with eleven million followers across, has been the most viral, and why?
Ep. 549 Fiber Is the Missing Micronutrient! – The Best Way to Fix Your Gut, Hormones & Metabolism with Dr. Karan Rajan | Menopause, Gut Health and Hormones
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13:25Cynthia ThurlowHOST
I'm curious if you're seeing similar prevalence and incidence in the UK and what do you attribute this to? What are some of your kind of prevailing thoughts on why we're seeing an increase in colorectal cancer?

Karan RajanGUEST
Yeah, I think it's increasing prevalence worldwide, particularly in Western countries.

Karan RajanGUEST
And I think there's probably a twofold reason or there's a myriad of reasons why this is happening.

Karan RajanGUEST
I would say we are more health conscious as a society, more people are getting checked up.

Karan RajanGUEST
So, you know, the sensitivity and specificity of stool tests and colonoscopies are improving.
18 MINS LATER
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32:39Cynthia ThurlowHOST
Do you feel that our kind of modern day lifestyle is priming us for dealing with more gut related symptomatology, not just in middle life, but throughout our lifetime vis-a-vis our modern day lifestyles?
Tweaks for 2026: How to eat better
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Karan RajanGUEST
I believe that either directly or indirectly, fibre has a role in almost every physiological function in humans.

Karan RajanGUEST
it has this laxative type effect where it sweeps through the intestines and it can basically scrape the lining of the intestines and act as a broom to just keep things moving.

Karan RajanGUEST
That's the sort of physical mechanical property that fiber fibers usually have.

Karan RajanGUEST
And then the other role is more of a chemical role where the fiber and specific types of fibers are digested in different ways by our gut bacteria to then produce different anti-inflammatory compounds, which are then used to nourish the body in many ways, whether it's brain health or gut health or metabolic health.
Recap: Simple ways to improve gut health today | Dr. Karan Rajan
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2:20Jonathan WolfHOST
When you're thinking about advising people about what they can do to make their guts happy, what do you say? And maybe we should start with food, but then I'd love to discuss some of the other things that you talk about as well.

Karan RajanGUEST
A lot of the at least easy options that someone can make a change from right now, listening to this podcast, from tomorrow, from today even, making that change.

Karan RajanGUEST
And we know the gut microbiome is quite adaptable, it bounces back, you know, relatively well, and it's very responsive to change.

Karan RajanGUEST
So even within 24 hours of eating a certain food, you can begin to see some changes in the microbiome.

Karan RajanGUEST
So, you know, if you look at most of the, you know, literature that's out there, the meta-analyses and the systematic reviews, when it comes to eating for better gut health, it's nothing very complicated if you break it down into, you know, we talk about fiber and prebiotics.
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6:38Jonathan WolfHOST
And I wanna come back to that, you know, the question right at the very beginning, what are your thoughts on probiotic supplements?

