Triglycerides are a type of fat found in the blood. They are the most common type of fat found in the body and are made up of three fatty acids connected to a glycerol molecule. Triglycerides are an important source of energy for the body as they provide more than twice the amount of energy found in carbohydrates. They are also essential for many other body functions such as synthesizing hormones, building cell membranes, and transporting lipids and fat–soluble vitamins throughout the body. Triglyceride levels can be measured through a blood test. High levels of triglycerides in the blood can be a sign of poor diet or lifestyle choice, and can increase the risk of heart disease. Triglycerides can be lowered through lifestyle changes such as exercise, healthy eating, and quitting smoking. Eating a diet low in saturated and trans fats, high in fiber and omega–3 fatty acids, and maintaining a healthy weight can also help reduce triglycerides.