Feel Better, Live More with Dr Rangan Chatterjee

Episode #582
Title: How Food, Fasting & Lifestyle Can Transform Your Metabolic Health & Reduce Your Risk of Disease with Dr Ben Bikman
Date: September 30, 2025
Guest: Dr. Ben Bikman, Professor at Brigham Young University, expert in insulin and metabolism

Episode Overview

In this episode, Dr. Rangan Chatterjee hosts Dr. Ben Bikman for an in-depth exploration of metabolic health, focusing on the central role of insulin. The conversation demystifies complex terms like "insulin resistance" and "metabolic health," highlights the global prevalence and causes of poor metabolic health, and offers practical, actionable strategies—around food choices, fasting, and lifestyle—that can dramatically improve health outcomes. Dr. Bikman also shares the latest science on tools (CGMs, exogenous ketones), the importance of cultural and genetic context, and the nuances between men and women regarding metabolism and fasting.

Key Discussion Points and Insights

1. Defining the Problem: Insulin Resistance and Its Far-reaching Impact

• Insulin Resistance Defined:

  • Insulin resistance is a two-part problem: cells are less responsive to insulin, and insulin levels in the blood are elevated (hyperinsulinemia).
  • "Insulin is the master metabolic hormone. It is the one hormone to rule all others. And if it's not working well, then metabolic processes in cells throughout the body are not going to work well." — Dr. Ben Bikman [05:48]

• Impact on Health:

  • Insulin resistance sits at the root of many chronic diseases: obesity, cardiovascular disease, stroke, Alzheimer's, infertility (PCOS), erectile dysfunction, skin disorders, and more.
  • Metabolic health = degree of insulin sensitivity.

• Prevalence:

  • In the US, 88% of adults have at least one marker of metabolic syndrome, indicating a massive public health crisis.
  • This is a global issue, with countries in South Asia and the Middle East also experiencing high rates of type 2 diabetes—even with lower obesity rates [09:10–12:30].

2. Genetics and Ethnicity: The Personal Fat Threshold

• Fat Storage is Not One-Size-Fits-All:

  • Ethnicity determines both the way fat is stored and metabolic risk.
  • "If you and I both gained 10 pounds of pure fat, genetics would suggest that I would simply just be that much chubbier... you are going to have consequences of insulin resistance." — Dr. Ben Bikman [21:02]

• Personal Fat Threshold:

  • Not how much fat, but how fat is stored (number and size of fat cells) matters:
    • Caucasians often create more, smaller fat cells (more metabolically healthy).
    • South/East Asians and Hispanics tend to create fewer, larger fat cells—more prone to insulin resistance at lower weights.
  • Genes like PPAR gamma play a determinative role [26:55].

• Evolutionary Hypotheses:

  • Differences possibly driven by ancestral need for insulation (subcutaneous fat in colder climates) vs. efficient sun-driven vitamin D production near the equator. [34:03]

3. Why Glucose Testing Alone is Insufficient

• Current Medical Practice:
  • The standard focus on blood glucose delays early detection, since elevated insulin can precede rising glucose by years.
  • "Our glucose centric paradigm has caused us to miss the more relevant marker... with a problem called insulin resistance, we should be measuring the insulin." — Dr. Ben Bikman [37:32]

4. Visible Clues: Skin as a Metabolic Window

• Physical Signs of Insulin Resistance:
  • Acanthosis nigricans: Darkened, velvety skin (often around neck, armpits, groin).
  • Skin tags.
  • "Skin is a window to the metabolic soul. There are two specific problems that are surprisingly connected to insulin resistance... the most common site is the collar line of the neck." — Dr. Ben Bikman [44:44]

5. Practical Strategies for Improving Insulin Sensitivity

A. Food Choice: "Control Carbs, Prioritize Protein, Don't Fear Fat"

• Avoid or minimize processed foods ("bags, boxes, barcodes").
• Focus on whole fruits and vegetables.
• Opt for carbs that grow above ground, smart carb choices even in high-carb cultures.
• High protein and healthy fats have minimal impact on insulin [47:57].
• "The more carbohydrates... from bags and boxes with barcodes, the more the person is going to be living a life of hyperglycemia and hyperinsulinemia." — Dr. Ben Bikman [48:07]

B. Fasting

• "An adult should be able to fast from calories, from food, for 24 hours... If a person cannot fast for 24 hours... that itself is a warning." — Dr. Ben Bikman [53:19]
• Mini fasts between meals (no grazing/snacking) as a starting point; full 24-hr fasts as an indicator of metabolic flexibility.

C. Meal Timing and Circadian Influence

• Eating earlier in the day is generally better for metabolic outcomes.
• Social context and family life matter—choose the strategies that you can sustain.
• Evening snacking is a major challenge for most; strategies include larger lunches to reduce evening cravings [72:19, 78:43].

D. Cultural Flexibility

• A low insulin strategy can be adapted to almost any dietary tradition by focusing on unprocessed foods and meal timing [72:19].

6. The Role of Devices and Self-Monitoring

• Continuous Glucose Monitors (CGM)

  • "I have known perhaps no single thing that has resulted in more behavior change than a CGM." — Dr. Ben Bikman [83:53]
  • Looking at glucose dynamically (not just fasting levels) is useful for understanding your body's response to food.

• Lumen Device (Measuring Fat vs Carb Burning; future, breath ketones)

  • Highlights the practical impact of meal timing, carb intake.

7. Exogenous Ketones

• What & Why:

  • Ketones: A by-product of fat burning, especially when insulin is low.
  • Exogenous ketones (like beta-hydroxybutyrate/BHB) can increase fat burning, provide an alternative brain fuel, and even increase cardiac output [92:26–107:50].
  • Used in both athletic performance (Tour de France teams) and neurological/cognitive disease (early Alzheimer’s, PCOS).

• Natural vs Supplemental:

  • Natural ketone production requires fasting/low insulin; exogenous forms allow ketones even when insulin/glucose are high.
  • Not a "natural" combo, but studies show safety and benefits even in those not on ketogenic diets.

8. Individualization: Gender, Menstrual Cycle, and Metabolic Nuance

• Women and Fasting:

  • Fasting is harder during the second half of the menstrual cycle (progesterone-driven luteal phase), where insulin resistance and appetite increase.
  • Easier in the follicular phase (first half, pre-ovulation): more fat burning, higher insulin sensitivity [55:41, 64:45].

• Metabolic Flexibility and Its Indicators:

  • Key sign: Ability to comfortably fast.
  • Stuck in "sugar burning" = metabolic inflexibility, more hunger, harder fat loss [61:46].

9. Lifestyle as Both Problem and Cure

• Big Picture:

  • Chronic illnesses are largely "diseases of lifestyle," so the solution must be lifestyle-based.
  • Pharmaceuticals may address symptoms but not root causes and can even worsen outcomes (e.g., type 2 diabetics put on more insulin, which increases death risk).

• Positive Message:

  • "As much as our conversation... can be quite sobering and sound like a bit of a horror story, it at least is one with a happy ending because it is a problem that can be changed very quickly." — Dr. Ben Bikman [47:57]

10. Environmental and Additional Factors

• Other Drivers of Insulin Resistance:
  • Inflammation and stress hormones (cortisol, epinephrine).
  • Poor sleep (as a cause of chronic stress).
  • Environmental toxins, e.g. diesel exhaust particles, can stimulate fat cell growth (teased for part 2) [127:20–127:27].

11. Biomarkers to Track

• Key Markers for Metabolic Health:
  • Fasting insulin under 6, HbA1c under 5.4 (ideally under 5.2), triglycerides/HDL ratio under 1.5.
  • If these are in a healthy range, specific diet matters less—so long as you’re eating mostly whole, unprocessed foods and are metabolically well [115:34–117:32].

Notable Quotes and Memorable Moments

• "Skin is a window to the metabolic soul." — Dr. Ben Bikman [00:01, 44:44]
• "If you and I both gained 10 pounds of pure fat... because your fat cells are now much bigger than mine, you are going to have consequences of insulin resistance." — Dr. Ben Bikman [21:02]
• "These diseases of lifestyle, it must be a lifestyle solution." — Dr. Ben Bikman [90:54]
• "As much as our conversation... can be quite sobering and sound like a bit of a horror story, it at least is one with a happy ending because it is a problem that can be changed very quickly." — Dr. Ben Bikman [47:57]
• "Change breakfast tomorrow... It has become a meal of dessert in many, many places globally at this point. This is not just an American phenomenon." — Dr. Ben Bikman [133:02]

Timestamps for Important Segments

• [03:56] — What is insulin resistance and why it matters
• [09:10] — Global prevalence of metabolic syndrome and ethnic differences
• [18:41, 20:59] — Fat storage, genetics, and personal fat threshold
• [34:03] — Evolutionary explanation for differences in fat storage
• [37:23] — Why testing glucose isn’t enough; importance of testing insulin
• [44:44] — Skin-based clues of metabolic dysfunction
• [47:57] — Practical ways to address insulin resistance through diet and fasting
• [55:41] — Sex differences in metabolism and fasting
• [72:19] — “Low insulin” vs. “low carb” diets; food choice frameworks
• [83:53] — CGMs, Lumen devices, and self-experimentation
• [92:26–107:50] — Ketones: metabolic role, exogenous supplements, who should use them
• [117:32] — Do optimal blood markers make diet debates irrelevant?
• [124:30] — Does fat storage pattern mean you need a different approach?
• [128:39] — Cold immersion: cultural/evolutionary context, psychological and metabolic benefits
• [133:02] — Final advice: anchor change in purpose; start with breakfast

Practical Takeaways

• If you only change one thing, start with breakfast: Either skip it (with a hot drink) or switch to a high-protein, low-insulin breakfast and avoid sugary, starchy cereals.
• Metabolic health is driven more by how and when you eat than just calorie counting.
• Empower yourself with data: Use CGMs, breath analyzers, or even note skin changes or energy levels to tailor your changes.
• Lifestyle always comes before medication in managing metabolic disease.

Where to Find More

• Dr. Ben Bikman website: https://benbikman.com
• Books: "Why We Get Sick," "How Not To Get Sick"
• YouTube Channel: (search "Ben Bikman")
• Instagram/Twitter: @drchatterjee, @benbikmanphd

Final Thought:
“Have a reason for wanting to be healthy that goes beyond weight loss. Change breakfast tomorrow—it’s the simplest, most impactful meal to change.” — Dr. Ben Bikman [132:55]