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.
Summary drafted from this entry’s sources; editorial review pending.
01Key questions
What is insulin resistance?
Cells stop responding to insulin, so the pancreas secretes ever more of it. The resulting chronic hyperinsulinemia drives fat storage and inflammation and typically precedes abnormal glucose readings by 10-15 years.
How is insulin resistance measured?
Fasting insulin plus fasting glucose, combined as HOMA-IR, is the standard entry-level panel. A Kraft-style glucose tolerance test with insulin assay or a continuous glucose monitor gives more detail.
Can insulin resistance be reversed?
The body rates ketogenic diets, time-restricted eating, adequate protein and exercise as the strong-evidence levers, with resistance training and post-meal walking improving glucose disposal directly.
Does high insulin cause disease beyond diabetes?
The model links it to obesity, cardiovascular disease, Alzheimer's (called type 3 diabetes here), PCOS, fatty liver and some cancers. The associations are real but the single-root-cause framing is contested.1
What would change this rating?
Randomized trials testing the carbohydrate-insulin model on hard clinical endpoints rather than surrogate markers.
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.
02The 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
- Chronic carbohydrate excess → persistent insulin elevation
- Cells become resistant to insulin signaling (downregulate receptors)
- Pancreas compensates by secreting even more insulin
- Hyperinsulinemia becomes chronic — "the noise drowns out the signal"
- 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 ←←←←←←←←←←←←←←←←←←←←←←←←←←←←←←←←←←←
03The 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 |
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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.
04Diseases 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."
- Obesity — insulin drives fat storage and blocks fat mobilization. You cannot efficiently burn fat in the presence of high insulin.
- Type 2 Diabetes — the endpoint of progressive insulin resistance. Beta cell burnout after decades of compensatory hyperinsulinemia.
- Cardiovascular disease — insulin stimulates smooth muscle proliferation, promotes plaque formation, drives hypertension via sodium retention
- Alzheimer's disease — "Type 3 diabetes" — brain insulin resistance impairs neuronal glucose metabolism (PMID 19221222)
- Cancer — insulin is a growth factor; hyperinsulinemia is associated with breast, colon, prostate, and pancreatic cancer
- PCOS — ovarian insulin resistance drives excess androgen production
- NAFLD/NASH — hepatic de novo lipogenesis driven by fructose and insulin
- Gout — hyperinsulinemia reduces renal uric acid excretion
- Erectile dysfunction — endothelial dysfunction from insulin-mediated vascular damage
- Acne — insulin and IGF-1 stimulate sebaceous glands and keratinization
05Root Causes of Insulin Resistance
Primary Drivers
- Chronic carbohydrate overconsumption — especially refined carbs and sugar
- Fructose — bypasses normal metabolic regulation, drives hepatic fat accumulation and ChREBP activation (Duke Health, 2024)
- Industrial seed oils — promote cellular insulin resistance via membrane fatty acid composition
- Chronic stress — cortisol promotes gluconeogenesis and insulin resistance
- Sleep deprivation — even one night of poor sleep reduces insulin sensitivity by ~25%
- Sedentary behavior — muscle insulin sensitivity requires regular physical activity
- ** 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)
06Reversing Insulin Resistance
Dietary Interventions
| Approach | Mechanism | Evidence |
|---|---|---|
| Ketogenic diet | Minimal insulin stimulus, rapid insulin reduction | Strong |
| Carnivore Diet | Zero carb = maximal insulin reduction | Emerging |
| Time-restricted eating | Prolonged low-insulin periods | Strong |
| Low glycemic/load diet | Reduced glucose/insulin spikes | Moderate |
| Protein-adequate diet | Improves satiety, preserves lean mass | Strong |
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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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07Uses
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
08Connections
09Sources
- PubMed 19221222PubMed 19221222
- Reaven GM. (1988). "Role of Insulin Resistance in Human Disease." Diabetes . PMID 3053874PubMed 3053874
- Ludwig DS, Ebbeling CB. (2018). "The Carbohydrate-Insulin Model of Obesity." JAMA Intern Med . PMID 29466592PubMed 29466592
10Entry history
Latest content update.
Heretic informs and never prescribes. Where amounts appear, they describe what published studies used. Talk to a qualified clinician before acting on anything here.