Feel Better, Live More with Dr Rangan Chatterjee

How To Use Food To Transform Your Health, Reverse Type 2 Diabetes & Improve Your Mood with Dr David Unwin #611

January 14, 2026

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  • Poor metabolic health, which precedes Type 2 Diabetes, manifests in often-overlooked symptoms like fatigue after meals, belly fat (waist circumference greater than half one's height), and brain fog. 
  • Dr. David Unwin reversed his own Type 2 Diabetes and high blood pressure through lifestyle changes, and his NHS practice data shows that 50% of patients adopting a low-carb approach achieve drug-free remission at three years. 
  • The traditional medical approach often fails to provide informed consent regarding lifestyle interventions for chronic conditions like Type 2 Diabetes, focusing instead on lifelong medication, whereas early intervention with diet yields significantly better remission rates. 
  • High blood sugar damages vascular-sensitive organs like the retina, and improvements in retinal health have been observed in patients who adopt a low-carb diet. 
  • The body attempts to tightly control blood sugar, but chronic metabolic abuse through diet leads to insulin resistance and damage long before a Type 2 Diabetes diagnosis. 
  • Ultra-processed food addiction is a significant, though often officially unrecognized, driver of poor metabolic health, with research suggesting a high correlation between this addiction and the likelihood of developing Type 2 Diabetes. 
  • Fasting insulin levels are a crucial, yet often inaccessible, early warning sign for insulin resistance that could predict Type 2 Diabetes years in advance. 
  • Individuals currently taking diabetes medication must consult their doctor before making drastic dietary changes, such as dramatically cutting carbohydrates, to prevent medication-related complications. 
  • Free resources like the Public Health Collaboration website offer accessible materials, including 'teaspoon of sugar' infographics and diet sheets, to support metabolic health improvement. 

Segments

Metabolic Health Early Warning Signs
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(00:00:01)
  • Key Takeaway: Fatigue after meals, increased belly fat, and cognitive fogginess are early, often overlooked signs of developing insulin resistance.
  • Summary: Only one in eight people are metabolically healthy, and symptoms like post-meal tiredness, belly fat exceeding half one’s height, and brain fog are precursors to Type 2 Diabetes. Dr. Unwin personally experienced these signs, including low mood and ‘frettiness,’ which all reversed upon dietary change. High triglycerides and fatty liver are also biochemical indicators of poor metabolic health.
Dr. Unwin’s Personal Health Shift
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(00:03:56)
  • Key Takeaway: A patient’s justified complaint about lack of dietary advice catalyzed Dr. Unwin’s shift toward low-carb principles, leading to his own health reversal.
  • Summary: Dr. Unwin was initially dissatisfied with the worsening health of his 10,000-patient practice, noting a tenfold increase in Type 2 Diabetes cases since 1986. A patient confrontation in 2012, who achieved remission without medication, exposed his failure to advise on carbohydrate restriction. His wife, a clinical health psychologist, further influenced him by sharing literature on diet and insulin resistance, prompting a major personal and professional change.
Informed Consent and Medical Practice
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(00:40:29)
  • Key Takeaway: Starting lifelong medication for Type 2 Diabetes without fully explaining lifestyle alternatives constitutes a failure of proper informed consent.
  • Summary: Dr. Unwin contrasts two consultation styles: one that immediately prescribes lifelong medication versus one that offers a collaborative choice between medication or lifestyle change to address the root cause. He notes that procedures require signed consent, yet repeat medications like Metformin are often prescribed without detailing common side effects like diarrhea. This lack of transparency extends to other drugs, such as SSRIs, where serious long-term risks are sometimes omitted.
Low-Carb Strategy for Diabetes Management
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(00:49:36)
  • Key Takeaway: For Type 2 Diabetics, meals should be based on increased protein, healthy fats, and abundant green vegetables, while reducing carbohydrates like bread, pasta, and potatoes.
  • Summary: Most patients report feeling less hungry on a low-carb diet, though some experience a temporary ‘keto flu’ as the body transitions to burning fat. Carbohydrates are broken down into sugar, and for insulin-resistant individuals, reducing them is key; this is quantified using a ’teaspoon of sugar equivalence’ for common foods like rice or bananas. The longer one waits to implement dietary change after diagnosis, the lower the chance of achieving remission.
Data Proving Low-Carb Efficacy
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(00:58:27)
  • Key Takeaway: Real-world data from Dr. Unwin’s practice shows that low-carb intervention leads to significant blood sugar improvement, cardiovascular risk reduction, and kidney function stabilization in diabetic patients.
  • Summary: In Dr. Unwin’s practice, 50% of low-carb patients with diabetes achieve drug-free remission by three years, and 48% see significant improvement, outcomes better than standard metformin. Furthermore, 93% of pre-diabetic patients achieve normal blood sugar levels on this approach. Audits confirm that every marker of cardiovascular risk improved, and kidney function also stabilized or improved, countering concerns about high protein or fat intake.
Retinal Improvement Post Low Carb
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(01:10:23)
  • Key Takeaway: Retinal health can improve following a low-carb intervention, providing evidence of systemic vascular benefits.
  • Summary: An ophthalmologist reported that patients’ retinas started improving after they adopted a low-carb diet and lost weight. The retina is highly sensitive to blood sugar damage, and its improvement serves as further proof of the diet’s efficacy. Peripheral neuropathy has also been observed to improve in these cases.
Dr Unwin’s High Carb Past
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(01:12:22)
  • Key Takeaway: Dr. Unwin’s former diet included approximately 300 grams of carbohydrates daily, often consumed as ‘sugar with sugar’.
  • Summary: Dr. Unwin detailed his past diet, which included liters of orange juice, muesli with sultanas, biscuits, sandwiches, crisps, and pasta, totaling around 300 grams of carbs daily. This high intake led to post-lunch drowsiness requiring chocolate and coffee to recover. His current intake is drastically reduced to about 40 grams per day, allowing him to function as a fat burner.
Low Carb Daily Intake & Fat Burning
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(01:14:51)
  • Key Takeaway: Transitioning to a low-carb diet (around 40g/day) shifts the body into a fat-burning state, eliminating daily hunger and energy dips.
  • Summary: Dr. Unwin currently consumes about 40 grams of carbohydrates daily and experiences no hunger dips because he is burning his own fat. He often eats only once or twice a day, skipping breakfast entirely, with typical meals consisting of protein and green vegetables, such as an omelette or pork with coleslaw.
Exercise and Fasting Fuel
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(01:16:25)
  • Key Takeaway: A fat-adapted body can perform low-intensity exercise, including running, without needing immediate carbohydrate intake.
  • Summary: Dr. Unwin does not change his eating habits when running, often running fasted in the morning without eating upon return, even after sprints or weights. Being a fat burner provides liberation from the constant need to eat, especially when travel limits food choices, unlike sugar burners who must eat.
Remission Methods Comparison
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(01:19:16)
  • Key Takeaway: Type 2 Diabetes remission can be achieved through multiple mechanisms, including low-carb, very low-calorie diets, and bariatric surgery.
  • Summary: While low-carb is Dr. Unwin’s preferred method, Professor Roy Taylor’s work using a prescribed 800-calorie soup diet also achieves remission by clearing liver fat. Bariatric surgery is fast but carries surgical risks and does not address the underlying behavioral causes like food addiction.
Physiology of Liver Fat and Diabetes
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(01:23:25)
  • Key Takeaway: Insulin resistance is caused by fat accumulation in the liver, which forces the pancreas to overproduce insulin until it fails, leading to Type 2 Diabetes.
  • Summary: Excess sugar, when not needed for energy, is converted by insulin into fat, primarily stored in the liver, causing insulin resistance. The pancreas compensates by ramping up insulin production (hyperinsulinemia) until it also fills with fat and shuts down the emergency response, resulting in system collapse and Type 2 Diabetes.
Low Carb for Plant-Based Diets
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(01:25:50)
  • Key Takeaway: Achieving low-carb success while maintaining a vegan or plant-based diet is possible but requires careful planning and resources.
  • Summary: Some patients have successfully achieved low-carb approaches while remaining vegan or plant-based, though it is less common. Resources like the DLife India website offer culturally acceptable, vegan/vegetarian recipes to support this path for motivated individuals.
Addressing Physician Curiosity & Guidelines
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(01:27:34)
  • Key Takeaway: Medical professionals often lack curiosity regarding patient success outside established guidelines, hindering the adoption of effective lifestyle medicine.
  • Summary: Doctors who are tired or strictly adhere to memorized guidelines may become defensive or uninterested when patients achieve remission through non-standard methods. Medical training often emphasizes memorization over the scientific method of hypothesis testing and learning from surprising wellness outcomes.
Gender Differences in Low Carb Success
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(01:37:37)
  • Key Takeaway: Women tend to lose a slightly higher proportion of weight on low-carb diets compared to men, but men often prefer simpler, less detailed dietary instructions.
  • Summary: Statistical analysis of Dr. Unwin’s data showed that while men lose more total weight, women achieve a slightly better percentage of weight loss. Female patients often request more detailed food plans and recipes, whereas male patients prefer brief, straightforward instructions.
Food Addiction and Maintenance
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(01:40:11)
  • Key Takeaway: Failure to address ultra-processed food addiction prevents long-term maintenance of health improvements, even after initial success.
  • Summary: Many patients, particularly women, feel shame regarding secret eating, but addiction criteria (knowing harm but being unable to stop) apply to ultra-processed foods like bread and pasta. Research indicates 14% of the UK population are food addicts, and this status increases the likelihood of developing Type 2 Diabetes by 600%.
Consequences of ‘Cheating’ on Diet
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(01:48:26)
  • Key Takeaway: For individuals with established metabolic issues or addiction tendencies, ‘cheat days’ result in severe negative psychological and physical rebound effects.
  • Summary: Dr. Unwin experienced two days of anxiety and depression following a single serving of special lemon pudding, illustrating the severe rebound effect. His wife, a serious addict, struggled to regain control of her carbohydrate intake for months after taking one day off their low-carb approach at Christmas.
Low Carb on a Budget
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(02:02:02)
  • Key Takeaway: Switching from processed junk food to whole foods on a low-carb diet can be budget-neutral if patients honestly track baseline spending and utilize cheaper frozen options.
  • Summary: Patients on benefits report that the cost is comparable to their previous spending on crisps, fizzy drinks, and fast food, provided they are honest about their baseline spending. Utilizing frozen fish, chicken thighs, and affordable whole foods like cabbage and eggs helps manage costs, and the free Freshwell app provides budget-friendly low-carb recipes.
Preventative Healthcare Redesign
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(02:07:03)
  • Key Takeaway: A preventative healthcare system requires taxing ultra-processed foods, subsidizing local whole foods, and allocating dedicated time for shared decision-making regarding lifelong medication.
  • Summary: The current system is too short-term and focused on treatment rather than prevention, leading to escalating chronic disease. Taxing ultra-processed foods (as done in Brazil) could fund subsidies for local, whole foods and mandatory 30-minute consultations before starting any lifelong medication to ensure patient buy-in and explore alternatives.
Political Short-Termism Hinders Prevention
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(02:13:16)
  • Key Takeaway: Political focus on short-term election cycles prevents investment in long-term preventative health measures.
  • Summary: Political incentives favor short-term gains necessary for re-election, making long-term prevention strategies less appealing. Prevention takes too long to show results for immediate electoral benefit. This short-termism mirrors the invisible drain on personal finances represented by unchecked standing orders.
Missing Diagnostic Tool: Fasting Insulin
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(02:13:38)
  • Key Takeaway: Fasting insulin measurement is a transformative, yet unavailable, NHS test for identifying insulin resistance years before Type 2 Diabetes diagnosis.
  • Summary: Insulin resistance causes the body to overproduce insulin, resulting in hyperinsulinemia, which is detectable via high fasting insulin levels. This measurement could serve as an early warning sign five years before a formal diabetes diagnosis. In the absence of direct insulin measurement, surrogates like triglyceride levels and liver function tests are used.
Power of Continuous Glucose Monitoring
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(02:15:16)
  • Key Takeaway: Continuous glucose monitors provide powerful, actionable information for individuals, even those not yet diabetic.
  • Summary: The speaker wishes to prescribe continuous glucose monitors to non-diabetic patients because information empowers learning about personal metabolic responses. Information is power, and seeing real-time glucose fluctuations can drive necessary behavioral changes. These devices can be purchased on platforms like Amazon.
Dr. Unwin’s Resources and Contact
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(02:15:49)
  • Key Takeaway: Dr. David Unwin shares resources including the free Freshwell app and collaborative low-carb recipe books.
  • Summary: Listeners can find Dr. Unwin on X (Twitter) as LocarbGP, connecting with a global network of informed individuals. He has co-authored eight recipe books with low-carb chefs, integrating physiology, psychology, and food preparation. These books include physiological insights from Dr. Unwin and psychological insights from Jen.
Final Advice for Health Action
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(02:17:35)
  • Key Takeaway: Diabetic patients must consult a doctor before dietary changes to adjust medication, while all individuals can access free Public Health Collaboration resources.
  • Summary: If already on diabetes drugs, drastically cutting carbs requires medical consultation to adjust medication dosages, especially insulin. The Public Health Collaboration website offers free, copyright-free resources, including millions of times downloaded ’teaspoon of sugar’ infographics and diet sheets. The overarching message is to be curious and notice what works for personal health improvement.
Host Closing Remarks and Do Health Promotion
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(02:19:06)
  • Key Takeaway: Teaching others health concepts reinforces personal learning, and Do Health offers personalized biomarker tracking including fasting insulin.
  • Summary: Sharing health knowledge with others benefits both the recipient and the teacher by improving retention. Do Health is promoted as a personalized health companion tracking 11 key blood biomarkers, including fasting insulin, which Dr. Unwin noted is often unavailable via the NHS. Listeners can sign up for the free Friday 5 email newsletter for exclusive health insights.