Myths vs facts: Insulin and weight loss

Insulin is a key metabolic hormone often surrounded by myths. A common myth: 'Insulin makes you fat' – in reality, insulin promotes fat storage only when there is a chronic calorie surplus. Without excess energy, insulin does not cause weight gain. Another myth: 'High insulin blocks fat burning' – while insulin acutely inhibits lipolysis, long-term fat loss depends on overall energy balance. Fact: Weight loss improves insulin sensitivity, not the other way around. People with insulin resistance often have higher fasting insulin, which can make weight loss harder but not impossible. Low-carb diets lower insulin but are not inherently superior for weight loss if calorie intake is matched. The evidence is mixed: many studies are mechanistic or observational. A DNA test for insulin resistance (e.g., IRS1 variants) provides only suggestive information, not a diagnosis. Important: Insulin is essential; drastic suppression is dangerous. For weight loss, focus on sustainable diet and exercise rather than fear of insulin.