Insulin Expert: Bread, Rice, Fruit & Potatoes Spike Blood Sugar Without You Knowing | Dr Unwin | E88

Main ideas & lessons

• A growing diabetes/obesity crisis (global “pandemic”)

  • Dr. David Unwin argues that type 2 diabetes, fatty liver, obesity, hypertension, and related diseases are rising worldwide.
  • He describes witnessing a dramatic increase in type 2 diabetes in his own decades-long UK practice, including young people.

• The core mechanism he emphasizes: insulin resistance → hyperinsulinemia → type 2 diabetes

  • High blood sugar, if uncontrolled, can damage the body’s vascular system.
  • Insulin’s role: helps keep blood glucose regulated by moving excess glucose into cells.
  • When excess dietary sugar/carbohydrates repeatedly raise glucose:
    • The body stores extra energy as fat (notably triglycerides), contributing to cardiovascular risk.
    • Fat accumulates in the liver (non-alcoholic fatty liver disease).
    • Liver fat can impair insulin’s effectiveness, leading to insulin resistance.
    • The pancreas compensates by producing more insulin (hyperinsulinemia) for years.
    • Over time, compensation fails and type 2 diabetes develops (described as an ~10-year progression).
  • Type 1 diabetes is framed as fundamentally different: lack of insulin production requiring insulin injections.

• Insulin’s broader effects (not just blood sugar)

  • Hunger/appetite loop: insulin helps drive hunger soon after glucose drops, contributing to overeating and weight gain (illustrated with eating habits like sweets/ice cream).
  • Blood pressure mechanism:
    • He cites older known science (1923 experiments) that insulin promotes the kidneys retaining salt.
    • Higher insulin levels are associated with salt/fluid retention → higher blood pressure.
    • He compares blood pressure to pressure needed for pipes, but warns too much pressure damages arteries → atheroma/narrowing → stroke risk.

• Why mainstream medicine may miss root causes

  • He criticizes treatment emphasis (e.g., metformin) without fully addressing underlying causes like insulin resistance/hyperinsulinemia.
  • He suggests doctors should focus on etiology (cause) rather than assuming the best treatment without understanding cause.

• Carbohydrates vs “sugar”: his practical claim about starch

  • He argues many people “think” they aren’t eating much sugar, but starch (bread, rice, potatoes) digests into glucose.
  • He provides “teaspoon of sugar equivalents” to communicate carbohydrate impact on blood sugar (e.g., banana ≈ multiple teaspoons; rice/potatoes/bread slices also mapped to teaspoons).
  • His view: reducing carbohydrates (especially ultra-processed, refined starches) reduces glucose spikes and improves insulin resistance.

• Diet methodology: a low-carb / ketogenic approach (with caution)

  • He outlines a general low-carb pattern:
    • Avoid/eliminate table sugar and “empty calories.”
    • Prefer protein, plenty of green vegetables, and some healthy fats (e.g., butter).
    • Swap sides: “instead of fries or rice, eat lots of green vegetables.”
  • Fruit:
    • He suggests fruit sweetness varies by plant/“sun exposure,” and he generally favors berries over highly sugary fruits for insulin-resistant patients.
    • He emphasizes individual response based on insulin sensitivity and the “matrix” effect of whole fruit vs juice/smoothies.
  • What to do if you want to know your response: measurement + experimentation
    • Continuous glucose monitors (CGMs):
      • He presents CGMs as real-time feedback to see glucose spikes after foods.
      • He suggests trying a CGM for ~2 weeks to learn which foods raise blood sugar.
    • Behavior change principle: faster feedback after a behavior helps modify habits more quickly than delayed lab averages (A1C).
  • Ketogenic diet details
    • He frames keto as lowering insulin so the body burns stored fat:
      • Insulin prevents fat burning; lower insulin enables fat burning into ketones.
    • Carbohydrate threshold:
      • “Magic number” ~<50 g/day, with 50–30 g/day leading to ketone production for many.
    • Benefits he claims:
      • Lower hunger (people ask why they aren’t hungry).
      • “Sharper mind” / improved concentration (based on his own experience and anecdotes).
    • Adaptation:
      • Enzyme adaptation may take ~2–3 weeks, with possible “keto flu.”
      • He advises fluids/salt/magnesium during adaptation.
    • Safety cautions:
      • If using diabetes medication (especially insulin), consult a doctor to avoid hypoglycemia.

• Intermittent fasting (IF) vs starvation

  • He distinguishes fasting (time-restricted eating with nutritious meals after) from starving (stressful deprivation).
  • Example timing for himself:
    • Eat around 12:30–7:00 pm, with overnight fasting until the next day (~12:30 onward).
  • He claims benefits include lower insulin and reduced inflammation.
  • Cautionary note:
    • He flags uncertainty about IF and eating disorders, while noting emerging literature suggests IF might not worsen anorexia.

• Fertility-related nuance

  • He addresses the idea that pregnant/trying-to-conceive women should avoid IF:
    • Emphasizes not starving.
    • Suggests IF (within a healthy eating window, nutrient-rich foods) differs from starvation stress.
    • Connects low fertility to insulin resistance (e.g., polycystic ovary disease), proposing low-carb approaches may help fertility in some contexts—while still describing it as “nuanced and complex.”

• Alcohol view

  • Alcohol can fit low-carb approaches if chosen carefully:
    • beer is high-carb (“liquid toast”), while dry wines and some spirits may be low-carb.
  • Key warning:
    • frequent alcohol can harm liver health, especially relevant to insulin resistance, so he limits alcohol (once or twice/week).

• Diabetes remission claims (outcome-focused)

  • He defines remission as:
    • Normal blood sugar levels without medication, sustainably.
  • He reports many remission cases in his practice, including a stated figure:
    • 24% of his NHS diabetes register at his clinic reportedly achieving remission without medication (and he describes ongoing savings to NHS drug budgets).
  • He argues remission often occurs via low-carb diet, not necessarily rapid weight loss (noting bariatric surgery can improve diabetes quickly without immediate weight loss as an example that mechanisms go beyond weight alone).

• Sleep, stress, and magnesium

  • Sleep matters because:
    • Heavy meals near bedtime worsen sleep.
    • Alcohol can impair sleep quality.
  • Magnesium:
    • He argues many people are magnesium deficient due to dietary uptake and modern agricultural decline in magnesium content.
    • He links magnesium to relaxation (calcium/magnesium balance), sleep, blood pressure, stress, and insulin resistance (he claims magnesium is involved in many enzymatic reactions).
  • Supplement forms:
    • magnesium citrate if bowel function allows / laxative effect is desired
    • magnesium glycinate for less diarrhea and for sleep support

• Exercise and “metabolic age”

  • He introduces metabolic age (insulin sensitivity/metabolic health) vs chronological age.
  • Exercise benefits:
    • Muscles absorb glucose and improve insulin sensitivity.
    • Strength training helps maintain muscle mass and function (including fall/hip-fracture risk reduction).
  • Examples include simple strength routines like “brain power squats.”

• Hope, psychology, and a CBT framework (“GRIN” model)

  • He presents his wife, Jen, as a psychologist researching the role of hope and mental well-being in outcomes after trauma.
  • He summarizes a CBT-inspired goal/strategy model called GRIN:
    • G = Goals (make goals realistic; understand “why” the goal matters)
    • R = Resources (skills, people, experience you can use)
    • I = Resilience (persistence despite setbacks)
    • N = Noticing/Next cycle (recognize what works and do more; repeat as a cycle)

• Dealing with failure

  • He advises reframing guilt and failure into learning:
    • Identify a specific moment of error
    • Extract what to learn
    • Change the next approach (and in medicine, conduct a structured review)
  • He shares personal reflections on life failures/adversity and emphasizes adaptation and learning.

• Final overarching advice

  • His “one essential piece of advice” to implement daily:
    • Awareness and running continuous personal experiments by noticing how variables (diet, sleep, exercise, stress) affect you.

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Methodology / instructions

Dietary approach (low-carb foundation)

Reduce/eliminate

• Table sugar (“empty” calories)
• Ultra-processed foods first (e.g., chips, cookies, Pringles/Doritos)
• Refined starches/carbohydrate-heavy staples (especially bread, rice, potatoes)

Prioritize

• Protein at meals (e.g., steak, fish, eggs, smoked salmon)
• Plenty of green vegetables (serving strategy: replace rice/fries with vegetables)
• Some healthy fats (e.g., butter; also fats in yogurt)

Fruit guidance

• Prefer less-sweet fruits (e.g., berries) for insulin-resistant individuals
• Avoid fruit juice/smoothies when insulin-sensitive (liquid form can spike sugar quickly)
• Adjust fruit quantities based on metabolic/insulin status

If using medication

• Consult a doctor before major carbohydrate elimination (risk of hypoglycemia)

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CGM “experiment” protocol (as described)

• Use a continuous glucose monitor for about 2 weeks
• Wear the sensor (arm) that sends readings to a phone
• Monitor how specific foods/meals change glucose in real time
• Use feedback to adjust diet choices (faster behavior-feedback loop than A1C)

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Ketogenic diet “threshold” and adaptation steps

• Aim for very low carbohydrate intake:
  • typically <50 g/day for fat burning/ketosis (he frames “50–30 g” as the range where insulin falls and ketones rise)
• Expect adjustment time:
  • about 2–3 weeks for enzyme/body adaptation
  • possible “keto flu” during transition
• Support adaptation (especially early on):
  • drink more fluids
  • possibly increase salt
  • consider magnesium
• Medication caution:
  • do not undertake keto without medical guidance if on insulin or other diabetes medication

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Intermittent fasting (IF) structure

• Do not “starve” (avoid stress from deprivation); instead:
  • eat nutrient-rich meals within a defined eating window
• Example described:
  • eat between 12:30 pm and 7:00 pm
  • fast overnight until next day (~12:30 pm)
• Exercise caution:
  • be mindful if you have an eating disorder (possible worsening is uncertain, so he flags it)

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Exercise / metabolic improvement actions

• Improve insulin sensitivity with muscle activity:
  • strength training / lifting weights
  • simple routines like bodyweight squats, stairs, or carrying shopping bags
• Aim to keep and build muscle strength to reduce long-term fall risk
• Treat “metabolic age” as modifiable through habits:
  • diet, sleep, exercise, whole-food focus

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GRIN model (psychological method)

• G (Objectives): set an outcome tied to a meaningful “why”; reject fake targets by testing how the desired result truly improves your life
• R (Resources): identify skills, people, support, and past experiences you can leverage
• I (Resilience/Incremental persistence): persist and try again
• N (Noticing/Next cycle): notice what works and repeat the cycle

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Failure reframing procedure (behavior change)

• Dissect guilt into a specific actionable review:
  • pinpoint the exact moment of error
  • extract a lesson from that moment
  • decide what to change next time (repeat learning cycle)

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Speakers / sources featured (including named people)

• Dr. David Unwin — main speaker; UK GP; low-carb/insulin-resistance emphasis
• Jen (Unwin) — psychologist; hope/CBT research
• Dr. Georgia Ede — psychiatrist specializing in nutrition (sugar) and mental health; referenced as a contributor
• Professor Brady — cardiology professor at the University of Glasgow; linked to the insulin–salt/blood pressure explanation
• Dr. Jason Fung — fasting expert; referenced for intermittent fasting framework
• Dr. Iain Campbell — University of Edinburgh researcher studying ketosis and mental illness (e.g., bipolar disorder)
• Professor Tim Noakes — endurance/sports ketogenic diet expert; referenced for sports application
• Dr. Florence Comite — Yale hormone expert; referenced regarding fertility/IF caution
• Abbott Laboratories — mentioned as a company related to CGMs; Unwin declares being a scientific advisor to them
• Public Health Collaboration (PHC) — UK NGO/charity founded by Unwin; referenced for educational resources
• University of Liverpool / NHS / UK public health context — institutions referenced (not as individual speakers)