What is insulin resistance

Understanding Insulin and Its Function

Insulin is a hormone produced by the pancreas that helps cells absorb glucose from the bloodstream, providing energy and maintaining normal blood sugar levels. In people with normal insulin sensitivity, cells respond quickly to insulin signals. When insulin resistance develops, cells become less responsive to insulin, meaning higher insulin levels are needed to achieve the same effect.

How Insulin Resistance Develops

Insulin resistance typically develops gradually over years due to a combination of genetic factors and lifestyle choices. Key contributors include:

• Obesity: Excess body fat, particularly around the abdomen, produces inflammatory substances that interfere with insulin signaling
• Physical inactivity: Muscles become more insulin-resistant without regular exercise
• High-sugar and refined carb diets: Frequent blood sugar spikes require excessive insulin production
• Sleep deprivation: Poor sleep impairs glucose metabolism
• Chronic stress: Stress hormones like cortisol can increase insulin resistance

Symptoms and Diagnosis

Insulin resistance often has no obvious symptoms, making it difficult to detect without medical testing. Some people may notice increased thirst, fatigue, or difficulty losing weight. Diagnosis typically involves blood tests measuring fasting glucose, fasting insulin levels, or the Homeostatic Model Assessment for Insulin Resistance (HOMA-IR) score.

Prevention and Management

Lifestyle modifications are the most effective approach for improving insulin sensitivity. These include losing 5-10% of body weight, engaging in at least 150 minutes of moderate exercise weekly, reducing refined carbohydrates, increasing fiber intake, and managing stress. Some medications like metformin may be prescribed in certain cases.

Health Consequences

If untreated, insulin resistance progresses to prediabetes and eventually type 2 diabetes. It's also linked to increased risk of heart disease, stroke, polycystic ovary syndrome (PCOS), and fatty liver disease. Early intervention through lifestyle changes can significantly reduce these risks.