What are triglycerides and why do they matter?

Triglycerides are the form fat takes in your bloodstream - calories you ate but did not immediately burn, packaged for storage. MedlinePlus and NHLBI put normal below 150 mg/dL, borderline at 150 to 199, high at 200 to 499, and very high at 500-plus. They matter two ways. At moderately high levels, they track with artery disease - especially alongside low HDL and belly fat, the metabolic pattern - and they signal insulin resistance brewing. At very high levels, above 500 and especially above 1000, the risk changes character: they can trigger acute pancreatitis, a dangerous inflammation of the pancreas. The good news: triglycerides are the most lifestyle-responsive number on the lipid panel, and the levers are specific. Alcohol raises them - sometimes dramatically - and cutting it drops them fast. Sugar and refined carbohydrates are the dietary drivers, more than dietary fat itself. Weight loss, regular activity, and omega-3-rich fish all lower them. Results also swing with recent meals, which is why fasting before the draw matters. Very high readings get medication on top of diet, because of the pancreatitis risk. Moderately high readings earn the lifestyle levers plus a glucose check - the triglyceride-and-low-HDL pair is often the first lab sign of insulin resistance. Abdominal pain radiating to the back with vomiting in someone with very high triglycerides is a same-day emergency. Pymander is a free AI doctor, 24/7 by text. Share your number and your habits, and it can help you read it.