John Halbert Diabetes Specialist. Does the Protocol Work?
If you've landed on this page, I'm assuming you've watched some part of that hour and half long video where a diabetes specialist going by the name Dr. John Halbert is interviewed by the host of "Talk Health" show, Amber Smith.
I've shared a screenshot from the video, below and that's what you're here for, you can keep on reading to discover what the so called "Halbert Protocol" is and whether it can help manage your type 2 diabetes or even reverse it.

Now, before you go any further, let me briefly explain who am i and why created this website and wrote this article.
Why I Created This Site
Let me be upfront: I’m not Dr. John Halbert, and this site isn’t affiliated with him or his clinic.
My name is Kristi Collyer, and I work in a community health center that serves mostly older adults.

Over the years, I’ve seen so many people walk through our doors—tired, frustrated, and overwhelmed—trying to manage their type 2 diabetes. Some have been living with it for years. Others were just diagnosed. And many of them have the same story: “I’m doing everything the doctor told me, but nothing seems to work.”
They’ve tried medications, cutting sugar, going on walks every day... yet their numbers keep creeping up. I wanted to understand why.
That’s when I came across Dr. Halbert’s interview with Amber Smith.
At first, I was skeptical. His explanation about a gut bacteria called Prevotella, which is produced while we sleep and can silently block insulin, sounded almost too strange to be real.
But the more I listened—and the more I read about the ZDA twin studies and what scientists were discovering—the more it made sense. Especially when I thought about the people I see every week who are doing everything right and still struggling.
I had so many questions:
- Could this bacteria really be the hidden cause of insulin resistance?
- Why haven’t I heard about it before?
- Is there solid research behind it?
- And most importantly: Could it help the people I work with finally get control over their blood sugar—naturally?
So I started digging. I read studies. I searched for real testimonials. I looked at what people were saying about Dr. Halbert’s “Halbert Protocol” and his best-selling book, Diabetes Freedom.
And I created this site to bring all of that information together in one place—because I figured if I was asking these questions, others probably are too.
If you’re curious and want to find out what I discovered, keep reading.
Who is Dr. John Halbert?

From watching the interview over and over again, here's a profile of or what information has been revealed of John Halbert.
Dr. John Halbert is widely regarded as one of the world’s top authorities on type 2 diabetes—and for good reason.
- He's a graduate of the prestigious University of Oxford, where he was named top of his class in 2002,.
- He made headlines early in his career for his groundbreaking research on pancreatic cell regeneration. His work quickly gained the attention of leading institutions around the world.
- He later completed his master’s degree at UCLA, where he continued to push the boundaries of diabetes research.
- During his five years in the U.S., his innovative approach earned him the title of youngest-ever Deputy Director at the American Diabetes Association.
- His true passion has always been helping everyday people take control of their health—without having to rely solely on medications, injections, or restrictive diets.
- Over the past two decades, he’s helped more than 28,000 people naturally manage and reverse their type 2 diabetes using a unique approach now referred to in medical circles as The Halbert Protocol.
- His international bestseller, Diabetes Freedom, has been translated into 47 languages and remained on the New York Times bestseller list for 52 weeks.
- Colleagues and patients alike have nicknamed him “The Diabetes Whisperer” for his ability to explain complex science in a way that actually makes sense—and works.
What is the Halbert Protocol?
The Halbert Protocol is a breakthrough approach to managing—and in some cases, reversing—type 2 diabetes by targeting something most people (including doctors) have never heard of: a gut bacteria called Prevotella.
This isn’t about cutting out all carbs, starving yourself, or taking endless medications. In fact, it turns a lot of what we thought we knew about diabetes upside down.
It all started with a unique twin study.
Back in 2002, Harvard researcher Dr. Amelia Rosewood was studying identical twins—Emily and Sarah.
They ate the same foods, lived in the same home, shared the same genes… yet only one of them developed type 2 diabetes.
That raised a huge question: If everything else was the same, what actually triggered the disease?
So Dr. Rosewood and her team launched a larger study with over 500 twins.
They tested everything: blood sugar levels, diet, lifestyle habits, hormones… but nothing explained why one twin would develop diabetes and the other wouldn't.
Then came a surprising idea—what if the answer had something to do with sleep?
No one had looked at that before. So they started analyzing the participants’ sleep patterns—and what they found shocked everyone.
The twins with type 2 diabetes had significantly higher levels of a specific bacteria in their gut called Prevotella. Meanwhile, the healthy twins had much lower amounts of it.
Even more interesting?
This bacteria was being produced in the body while they slept—and poor sleep seemed to trigger even more of it.
To make sure this wasn’t just a coincidence, researchers did something radical.
They took this Prevotella bacteria from a diabetic twin and placed it into the gut of a healthy lab mouse.
Then they gave that mouse and its twin sibling the same food, same portions, at the same time—everything was identical.
Four weeks later?
- The mouse with the Prevotella developed early signs of type 2 diabetes.
- It became insulin resistant.
- And it gained 38% more body fat than its sibling—without eating a single extra calorie.
That was the moment scientists realized: Prevotella wasn’t just present in people with diabetes—it was likely a major cause of it.
And that’s where Dr. John Halbert comes in.
Using this discovery, he developed the Halbert Protocol—a step-by-step system that helps people naturally reduce the amount of Prevotella bacteria in their gut, restore healthy insulin function, and take back control of their blood sugar.
The protocol doesn’t involve extreme diets or intense workouts. It focuses on three key things:
- Supporting the gut with specific nutrients that reduce Prevotella growth
- Improving sleep quality, since that’s when the bacteria tends to thrive
- Timing meals and foods in a way that helps reset insulin sensitivity
Over the years, more than 28,000 people have followed the Halbert Protocol, and many have reported dramatic improvements—including stable blood sugar, weight loss, increased energy, and in some cases, completely eliminating the need for insulin or prescription meds.
It’s been so effective that doctors now refer to it simply as "The Halbert Protocol."
So if you’ve ever felt like you’re doing everything right but still can’t get your blood sugar under control—this may finally explain why.
And more importantly, it may point you to a solution that actually works with your body, not against it.
The protocol utilizes 4 carefully-selected premium ingredients spearheaded by Gymnema sylvestre, known worldwide for its ability to support blood sugar control.
In Japan (which has one of the lowest type 2 diabetes rates anywhere in the world), it's a common ingredient so much so that they call it the "sugar destroyer".
If you're interested in trying it out for yourself, the protocol is available in a natural formula called Gluco Control liquid drops which is available for as little as $79 with a 60-day money back guarantee.
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