# Metabolic health and insulin

Rating: Speculative — Little primary evidence yet: mechanism, anecdote or tradition
Type: Mechanism
Updated: 2026-08-06
Canonical: https://heretic.bio/articles/metabolic-health-and-insulin.html

> This entry presents the insulin-centric model: chronic carbohydrate excess keeps insulin elevated, cells become resistant, and the resulting hyperinsulinemia is proposed to drive obesity, diabetes, cardiovascular disease and related conditions years before glucose or HbA1c move. Fasting insulin and HOMA-IR are the early markers discussed for tracking risk. The framework is mechanistically coherent and useful for risk detection, though insulin-as-root-cause remains a contested model rather than settled consensus.

> **Core thesis:** Hyperinsulinemia — chronically elevated insulin — is the root cause of most chronic disease in the modern world. It precedes and drives obesity, type 2 diabetes, cardiovascular disease, Alzheimer's, cancer, and PCOS. Conventional medicine treats downstream symptoms while ignoring the upstream cause: toxic levels of insulin driven by chronic carbohydrate overconsumption.  
  
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## The Insulin-Centric Model

### Insulin's Normal Role

  * **Hormone of abundance:** Released when food (especially carbohydrate) is consumed
  * **Primary functions:** Drive glucose into cells, suppress fat breakdown (lipolysis), promote fat storage
  * **Anabolic hormone:** Builds tissue, stores energy — essential in appropriate amounts



### What Goes Wrong: Insulin Resistance → Hyperinsulinemia

  1. **Chronic carbohydrate excess** → persistent insulin elevation
  2. **Cells become resistant** to insulin signaling (downregulate receptors)
  3. **Pancreas compensates** by secreting even more insulin
  4. **Hyperinsulinemia** becomes chronic — "the noise drowns out the signal"
  5. **Downstream effects:** Fat storage, inflammation, endothelial dysfunction, cellular proliferation



### The Vicious Cycle
    
    
    Excess carbs → High insulin → Insulin resistance → Higher insulin → More fat storage
         ↑                                                                    ↓
         ←←←←←←←←←← Hunger/cravings ←←←←←←←←←←←←←←←←←←←←←←←←←←←←←←←←←←←
    

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## The Spectrum of Metabolic Dysfunction

Stage | Fasting Insulin | Fasting Glucose | HbA1c | HOMA-IR | Status  
---|---|---|---|---|---  
**Optimal** | < 3 μIU/mL | < 85 mg/dL | < 5.0% | < 0.5 | Excellent  
**Early decline** | 3-6 | 85-95 | 5.0-5.2 | 0.5-1.0 | Good but watch  
**Insulin resistant** | 6-12 | 95-110 | 5.2-5.6 | 1.0-2.5 | Problem starts  
**Pre-diabetic** | 12-25 | 110-125 | 5.6-6.4 | 2.5-5.0 | Significant damage  
**Type 2 diabetic** | >25 (initially) | >126 | >6.4 | >5.0 | Advanced  
  
> **Key insight:** Fasting insulin is the canary in the coal mine. By the time fasting glucose or HbA1c are elevated, insulin resistance has typically been present for 10-15 years.

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## Diseases Driven by Hyperinsulinemia

### The "Civilization Diseases"

Dr. Joseph Kraft (1923-2017) performed >14,000 oral glucose tolerance tests with insulin assays. His conclusion: **"The sooner we diagnose and treat hyperinsulinemia, the more diseases we can prevent."**

  1. **Obesity** — insulin drives fat storage and blocks fat mobilization. You cannot efficiently burn fat in the presence of high insulin.
  2. **Type 2 Diabetes** — the endpoint of progressive insulin resistance. Beta cell burnout after decades of compensatory hyperinsulinemia.
  3. **Cardiovascular disease** — insulin stimulates smooth muscle proliferation, promotes plaque formation, drives hypertension via sodium retention
  4. **Alzheimer's disease** — "Type 3 diabetes" — brain insulin resistance impairs neuronal glucose metabolism (PMID [19221222](https://pubmed.ncbi.nlm.nih.gov/19221222/))
  5. **Cancer** — insulin is a growth factor; hyperinsulinemia is associated with breast, colon, prostate, and pancreatic cancer
  6. **PCOS** — ovarian insulin resistance drives excess androgen production
  7. **NAFLD/NASH** — hepatic de novo lipogenesis driven by fructose and insulin
  8. **Gout** — hyperinsulinemia reduces renal uric acid excretion
  9. **Erectile dysfunction** — endothelial dysfunction from insulin-mediated vascular damage
  10. **Acne** — insulin and IGF-1 stimulate sebaceous glands and keratinization



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## Root Causes of Insulin Resistance

### Primary Drivers

  1. **Chronic carbohydrate overconsumption** — especially refined carbs and sugar
  2. **Fructose** — bypasses normal metabolic regulation, drives hepatic fat accumulation and ChREBP activation (Duke Health, 2024)
  3. **[Industrial seed oils](seed-oils-and-inflammation.html)** — promote cellular insulin resistance via membrane fatty acid composition
  4. **Chronic stress** — cortisol promotes gluconeogenesis and insulin resistance
  5. **Sleep deprivation** — even one night of poor sleep reduces insulin sensitivity by ~25%
  6. **Sedentary behavior** — muscle insulin sensitivity requires regular physical activity
  7. ** visceral fat accumulation** — adipokine secretion (TNF-α, IL-6, resistin) promotes systemic resistance



### The Fructose Problem

  * Fructose metabolism bypasses phosphofructokinase (the main regulatory checkpoint)
  * Depletes hepatic ATP → generates uric acid → mitochondrial dysfunction
  * Activates ChREBP → drives hepatic glucose production _despite_ insulin signaling
  * This may explain why insulin resistance develops even before significant fat accumulation (Duke Health, 2024)



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## Reversing Insulin Resistance

### Dietary Interventions

Approach | Mechanism | Evidence  
---|---|---  
**[Ketogenic diet](ketogenic-approaches.html)** | Minimal insulin stimulus, rapid insulin reduction | Strong  
**[Carnivore Diet](carnivore-diet.html)** | Zero carb = maximal insulin reduction | Emerging  
**[Time-restricted eating](fasting-approaches.html)** | Prolonged low-insulin periods | Strong  
**Low glycemic/load diet** | Reduced glucose/insulin spikes | Moderate  
**Protein-adequate diet** | Improves satiety, preserves lean mass | Strong  
  
### Exercise as Medicine

  * **Resistance training:** Increases muscle mass (primary glucose disposal tissue)
  * **Zone 2 cardio:** Increases mitochondrial density and fat oxidation
  * **HIIT:** Rapidly depletes glycogen → improves insulin sensitivity for 24-48 hours
  * **Post-meal walking:** 10-15 min walk after meals reduces glucose spikes by 20-30%



### Key Supplements

Supplement | Mechanism | Evidence  
---|---|---  
**Berberine** | AMPK activator, comparable to metformin | Strong  
**Chromium picolinate** | Enhances insulin receptor signaling | Moderate  
**Magnesium** | Cofactor in insulin signaling cascade | Moderate  
**Alpha-lipoic acid** | Insulin sensitizer, antioxidant | Moderate  
**Inositol (MYO + DCI)** | Insulin signaling, especially for PCOS | Strong (PCOS)  
**Apple cider vinegar** | Acetic acid slows gastric emptying, reduces glucose spike | Moderate  
  
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## Uses

### Essential Tests

  * **Fasting insulin** (ask specifically — not routinely ordered)
  * **Fasting glucose**
  * **HbA1c**
  * **HOMA-IR** (calculated: fasting glucose × fasting insulin / 405)
  * **Triglyceride:HDL ratio** (surrogate for insulin resistance)
  * **C-peptide** (measures actual insulin production)



### Advanced

  * ** Kraft-style OGTT with insulin assay** (2-5 hour)
  * **Continuous glucose monitor (CGM)** — reveals postprandial patterns
  * **HOMA2-IR** — more accurate calculation
  * **Uric acid** — marker of fructose metabolism



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## Sources

1. PubMed 19221222 (PubMed 19221222)
2. Reaven GM. (1988). "Role of Insulin Resistance in Human Disease." Diabetes . PMID 3053874 (PubMed 3053874)
3. Ludwig DS, Ebbeling CB. (2018). "The Carbohydrate-Insulin Model of Obesity." JAMA Intern Med . PMID 29466592 (PubMed 29466592)