What does it mean to have high triglycerides? What are triglycerides?

What are triglycerides? 

Triglycerides are the common fats in the blood. You need them, just as you need cholesterol in your body. Some of the triglycerides are burned by the muscles for energy, while others are stored in fat tissue or circulate in the blood. Some of these free floating triglycerides can end up lodged in arterial plaque deposits. They are often overlooked as a risk factor, since their relationship to heart disease is not as well documented as that of cholesterol. High intake of refined carbohydrates, too little physical activity, excess weight, a family history of diabetes, and a low fiber intake all conspire to raise the level of these fats in the blood. If your triglycerides tend to be too high, cut down on foods made with white flour and avoid concentrated sugar products (get your sugars from fresh or dried fruits). Replace some high-sugar foods with foods containing the good fats, such as avocado, olive oil, and nuts. Excessive alcohol intake can also raise blood triglycerides. If you drink alcoholic beverages, it is best to drink them with meals and in moderation.