Triglycerides are the most common type of fat (lipid) in the body. Extra calories, especially from refined carbohydrates, sugar and alcohol, are converted into triglycerides and stored in fat cells for later energy.
High triglyceride levels often travel with low HDL and other risk factors, and can raise the risk of heart disease; very high levels can also inflame the pancreas. They're measured on a standard cholesterol (lipid) panel, usually fasting. Cutting back on sugar, refined carbs and alcohol, losing excess weight and staying active help lower them. See how to lower cholesterol.