The Diary Of A CEO with Steven Bartlett

Insulin Doctor: This Is The First Sign Of Dementia! The Shocking Link Between Keto & Brain Decline!

November 24, 2025

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  • Excessive and chronic high insulin levels are the root cause of numerous chronic diseases, including high blood pressure, cancer, and debris accumulation in the brain linked to depression and neurodegenerative issues. 
  • Achieving a ketogenic state by lowering insulin is presented as the key mechanism to reverse existing medical problems and improve health span, with ketones offering a cleaner, more efficient fuel source for the brain. 
  • The 'Keto Continuum' outlines a 12-step process for achieving consistent ketosis, emphasizing that severely insulin-resistant individuals may need up to two weeks of very low carbohydrate intake (under 20g) before producing measurable ketones. 
  • A short-term, nutrient-dense 'sardine fast' can rapidly induce ketosis and satiety, even for those struggling with high insulin levels that block fat utilization. 
  • Total carbohydrate count, not net carbs, must be strictly managed when attempting to enter a ketogenic state, especially for individuals with insulin resistance. 
  • Exogenous ketones can serve as a powerful jumpstart for the liver to begin producing its own ketones, which is particularly beneficial for patients with chronic insulin resistance or those undergoing cancer treatment. 

Segments

Insulin’s Role and Chronic Disease
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(00:01:26)
  • Key Takeaway: Excess insulin is a chronic disease maker, causing high blood pressure, cancer, and brain debris linked to depression and Alzheimer’s.
  • Summary: Excessive insulin production, often unnoticed, drives chronic disease progression. High insulin levels cause inflammation and debris accumulation in the brain, contributing to conditions like brain fog and Parkinson’s. Reversing this high insulin state through the ketogenic diet is promoted as the path to optimal health within a year.
Timing of Food Intake
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(00:02:03)
  • Key Takeaway: Eating late at night stimulates excessive insulin production, which accelerates aging and chronic inflammation.
  • Summary: The timing of calorie intake is critical, especially with age, where one bite eaten after 6 PM is metabolically equivalent to ten bites before noon. Late-night eating stimulates insulin production that can remain high throughout the night, preventing the body from clearing metabolic trash. Moving caloric intake toward the morning is advised to manage insulin response effectively.
Defining Insulin and Its Function
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(00:11:54)
  • Key Takeaway: Insulin’s primary role is to move glucose into cells, but in excess, it stores energy as fat and promotes growth, leading to pathology when chronic.
  • Summary: Insulin insulates and makes the body ‘fluffy’ by storing energy, but chronic excess causes growth beyond necessary fat storage, manifesting as skin tags and thicker skin. High insulin hides the debris being made in the body, including between brain cells, and this trash is only cleared when insulin levels drop.
Signs of Insulin Resistance
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(00:15:24)
  • Key Takeaway: Physical signs of high insulin include abdominal girth, skin tags, velvety dark skin (acanthosis nigricans), and hair loss on the toes.
  • Summary: Abdominal girth is the earliest physical indicator of excess insulin. Skin tags, which have a neck and mushroom shape, will fall off when insulin lowers, and dark, thick skin on the back of the neck or in creases signals pathology. Hair loss on the toes, progressing up the lower extremities, is a sign of chronic high insulin preventing resource allocation to those areas.
Ketones as Superior Fuel
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(00:24:46)
  • Key Takeaway: Ketones provide a cleaner fuel source than glucose, reducing cellular trash, lasting longer, and effectively crossing the blood-brain barrier.
  • Summary: Burning ketones is an antioxidant state that produces less cellular byproduct (trash) compared to glucose metabolism, which is crucial for aging bodies. Ketones bypass the transport issues faced by glucose in insulin-resistant brains, leading to improved concentration, focus, and reduced impulsivity.
Time to Achieve Ketosis
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(00:28:41)
  • Key Takeaway: For severely insulin-resistant individuals, it can take up to 15 days of strict carbohydrate restriction (under 20g) to empty glycogen stores and begin producing ketones.
  • Summary: Dr. Bosworth shared her personal struggle, taking 15 days of fasting and intense activity to finally produce a measurable ketone due to a decade of high insulin locking up stored sugar (glycogen). Once metabolically fit, the return to ketosis after a high-carb meal can be as fast as 12 hours.
Keto Continuum Steps
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(00:48:49)
  • Key Takeaway: The Keto Continuum is a 12-step process where initial stages focus on carb restriction and measuring ketones, progressing to time-restricted eating and prolonged fasting for metabolic reset.
  • Summary: The first four steps involve reducing carbs to 20g total daily and using urine strips to confirm ketone production, with the goal of skipping meals by day 10 for the average person. Advanced stages involve sliding into longer fasting windows (16:8, then 23:1), culminating in 36 to 72-hour fasts necessary to reset the pancreas in long-term insulin-resistant patients.
Sardine Challenge for Beginners
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(00:55:54)
  • Key Takeaway: Eating only sardines for three days is a simple, affordable, and nutrient-dense tool to force the body into a ketogenic state when behavioral change is difficult.
  • Summary: Sardines are recommended because they are high in healthy fats, protein, affordable, and lack the bitterness found in other canned fish like tuna. This ‘Sardine Challenge’ simplifies the initial dietary shift, ensuring high fat intake necessary to produce ketones, especially when existing body fat is locked by high insulin.
Sardine Fast and Ketone Generation
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(00:56:48)
  • Key Takeaway: A three-day sardine-only diet, without eating window limits, is prescribed to force abundant ketone production by providing high fat and protein.
  • Summary: Dr. Boz uses a three-day sardine-only challenge within a 21-day program to ensure participants achieve high ketone levels. This method focuses on satiety through nutrient-dense food rather than restricting the amount eaten. High insulin levels can prevent the body from accessing stored fat to make ketones, even when carbs are restricted.
Macros and Ketosis Entry
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(00:58:28)
  • Key Takeaway: Focusing on achieving high ketone readings is more important than strictly counting macros; high fat intake combined with low carbs will overcome insulin-driven resistance.
  • Summary: The primary indicator of successful ketosis is a high ketone reading, which implies adequate fat and protein intake alongside sufficiently low carbohydrates. If ketones are absent despite low carb intake, the underlying issue is excessive insulin locking up fat stores. Increasing fat intake while keeping carbs low is the direct solution to force ketone production.
Keto Shopping List and Fat Intake
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(00:59:07)
  • Key Takeaway: A ketogenic shopping list should prioritize fatty meats like pork belly and brisket over high-carb fruits like avocados, which can stall ketosis if overconsumed.
  • Summary: Essential keto foods include pork belly, eggs, and beef brisket, while avocados must be consumed sparingly due to their carbohydrate content. For individuals struggling to enter ketosis, consuming pure fat, such as butter for a day, can be a powerful intervention. Total carbohydrate count, not net carbs (fiber included), must be the focus for those with prior insulin resistance.
Sardine Challenge Psychological Impact
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(01:00:32)
  • Key Takeaway: Extended restrictive diets like the 100-day sardine-only challenge can force confrontation with emotional eating patterns and lead to profound psychological breakthroughs.
  • Summary: Jane’s 100-day sardine challenge helped her address deep-seated emotional wounds associated with food use, leading to a feeling of freedom she hadn’t experienced before. The ketogenic diet’s success is often limited not by chemistry, but by human factors like stress and unresolved emotional history with food. This intense dietary focus can create a vulnerable space for confronting these underlying issues.
Gut Microbiome on Carnivore Diet
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(01:02:58)
  • Key Takeaway: A high-fat, carnivore-style diet, such as the sardine challenge, can strengthen the gut microbiome’s protective slime layer and resolve inflammatory bowel symptoms without plant fiber.
  • Summary: Fiber from plants can tear down the protective slime layer of the gut, whereas a carnivore diet can lead to a stronger, healthier microbiome, reversing issues like chronic diarrhea. Butyrate, a two-carbon fat chain essential for gut health and GLP-1 production, can be derived from ketones (beta-hydroxybutyrate) in circulation, not just fiber fermentation. A narrow diet like 100 days of sardines is sufficient to maintain a supportive microbiome structure.
Vitamin D and Insulin Link
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(01:07:36)
  • Key Takeaway: High insulin levels sequester Vitamin D in fat cells, preventing it from acting as a crucial hormone throughout the body, which is reversed by lowering insulin via ketosis.
  • Summary: Vitamin D functions as a hormone that signals cells to operate optimally, but it is fat-soluble, causing it to become trapped when insulin is high. Dr. Boz’s patient saw her Vitamin D levels jump from the 30s/40s to over 100 after adopting the sardine diet because lowered insulin allowed the fat-soluble vitamin to circulate freely. Achieving ketosis is key to unlocking the body’s ability to utilize stored fat-soluble nutrients like Vitamin D.
Essential Supplements and Exogenous Ketones
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(01:10:43)
  • Key Takeaway: Magnesium supplementation and magnesium floats are vital because soil depletion has made food sources inadequate, and exogenous ketones act as a signal to the liver to increase endogenous ketone production.
  • Summary: Magnesium is a necessary ‘spark plug’ for enzyme function, requiring supplementation or absorption via skin contact (like in a magnesium float). Exogenous ketones are not just fuel; they signal the liver to produce more ketones, effectively jumpstarting the system for those with chronic insulin resistance. This signaling effect also tells the body to prioritize burning fat over muscle mass, offering protection during catabolic states like chemotherapy.
Keto Diet in Cancer Support
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(01:14:32)
  • Key Takeaway: The ketogenic diet supports cancer patients by starving glucose-dependent tumor cells (Warburg effect) and creating a healthier physiological environment to better manage treatment side effects.
  • Summary: Dr. Boz’s mother experienced a 70% drop in cancer markers in six weeks on keto, far exceeding the expected 30% drop from chemotherapy alone. Cancer cells often rely heavily on glucose, and keto starves them while supporting normal tissue which can utilize ketones. While keto may not reverse cancer, it significantly improves the body’s environment to handle disease and treatment.
Methylene Blue and Creatine Benefits
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(01:23:52)
  • Key Takeaway: Methylene blue is a powerful, non-commercial brain energizer that acts as an electron carrier to supercharge mitochondrial function in brain cells, and creatine is essential for brain function, not just bodybuilding.
  • Summary: Methylene blue’s ability to dye organs blue confirms it reaches target cells, where it helps mitochondria maintain high energy levels, making it an effective brain supplement. Creatine supplementation can cause falsely elevated creatinine levels on standard kidney blood tests, but this does not indicate actual kidney damage. Creatine is highly beneficial for focus, ADHD, and mitigating jet lag by aiding sleep reset.
Natural GLP-1 Alternatives for Cravings
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(01:27:58)
  • Key Takeaway: Achieving a ketogenic state naturally raises appetite-suppressing hormones like GLP-1, offering a non-injectable, sustainable alternative to pharmaceutical GLP-1 agonists.
  • Summary: Weight loss itself naturally raises suppressed GLP-1 levels, and the ketogenic diet is powerful because it achieves this naturally. Consuming butyrate (a ketone) and allulose can provide an additional boost to GLP-1 production, which suppresses cravings similarly to pharmaceutical injections. When in ketosis, cravings for high-sugar items naturally vanish because the body is fueled by stable fat energy.
Motivation Through Deep Purpose
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(01:31:26)
  • Key Takeaway: Long-term health motivation requires moving beyond crisis mode to identify and reframe one’s deepest insecurities or failures into a core, driving purpose.
  • Summary: Crisis brings people in, but sustained adherence requires connecting to a deep, personal ‘why’ that can be relied upon when motivation wanes. Dr. Boz reframed her childhood insecurity as the power that makes her work hard when others quit, illustrating how deep personal truths can fuel long-term commitment. Patients often need multiple iterations of self-reflection exercises to uncover this core purpose.
Overcoming Legal Persecution
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(01:35:08)
  • Key Takeaway: Standing firm on the intention to serve the poor led Dr. Boz to face 12 felonies and a 24-year sentence, but ultimately, the Supreme Court overturned the politically motivated charges.
  • Summary: Dr. Boz was charged with 12 felonies for technically failing to witness petition signatures while she was out of state, an action seen as an abuse of power by a political opponent. Despite losing income and selling assets during the nine-month investigation, she refused to stop serving impoverished patients. The judge suspended the 24-year sentence, and the Supreme Court later invalidated several charges, validating her commitment to patient care.
Finding Inner Peace Through Faith
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(01:47:53)
  • Key Takeaway: Daily devotion, rooted in scripture and prayer practiced consistently during good times, provides the necessary foundation to navigate emotionally triggered, difficult days.
  • Summary: Dr. Boz maintains inner peace through a daily morning devotion involving scripture and prayer, emphasizing that consistency during good times builds the foundation for hard times. She relies on the accumulated wisdom of generations documented in faith practices to guide her through problems, rather than trying to solve unique issues in isolation.