If you’re overweight or obese, you have a greater chance of having abnormal levels of blood fats. These include high amounts of triglycerides and low-density lipoprotein (LDL) cholesterol (a fat-like substance often called “bad” cholesterol), and low high-density lipoprotein (HDL) cholesterol (often called “good” cholesterol). Abnormal levels of these blood fats are a risk for heart disease.