LIPIDS SIMPLIFIED Understanding Cholesterol Using the “Highway Truck Model” 1. The Basic Idea 🧱 Cholesterol A building material for the body Used to make cell walls, hormones, and bile acids 🚛 Lipoproteins Trucks that transport cholesterol through the bloodstream ⛽ Triglycerides Portable fuel containers carried by these trucks The Lipid Transport System (The Highway Model) 🚛 LDL — Delivery Trucks Carry cholesterol bricks from the liver warehouse to body tissues Problem: Too many delivery trucks → cholesterol traffic jam (artery plaque) Target Ideal: <130 mg/dL High risk: >160 mg/dL ♻️ HDL — Recycling Trucks Clean up leftover cholesterol from tissues & arteries and return it to the liver. More recycling trucks = better cleanup. Target Men: >40 mg/dL Women: >50 mg/dL ⛽ VLDL — Fat Cargo Trucks Carry large boxes of triglycerides (fat fuel) from liver to storage. Estimated value VLDL ≈ Triglycerides ÷ 5 Target <20 mg/dL ⛽ Triglycerides — Fuel Containers Represent ex...
The HOMA-IR (Homeostatic Model Assessment of Insulin Resistance) is a simple, widely used mathematical index to estimate insulin resistance from routine blood tests. It is not a direct lab test but a calculation based on fasting blood glucose and fasting insulin levels. It helps detect early insulin resistance, which is a key driver of prediabetes, type 2 diabetes, fatty liver (MASLD), metabolic syndrome, PCOS, and related conditions—especially relevant in India where these issues are rising rapidly. How the HOMA-IR Test Is Performed You need to be fasting for at least 8–12 hours (usually overnight). A blood sample is drawn to measure: Fasting plasma glucose (in mg/dL or mmol/L) Fasting insulin (in μU/mL or μIU/mL) No special preparation beyond fasting; it's often done alongside routine sugar tests. Calculation Formulas There are two common versions depending on units: Most widely used (SI units, common internationally and in many Indian labs) : HOMA-IR = (Fasting insu...