The type of fat considered unhealthy and that should be limited in the diet is trans fat. Trans fats are often found in processed foods, snack products, and margarine, and they have been shown to increase levels of bad cholesterol (LDL) while decreasing good cholesterol (HDL). This imbalance increases the risk of heart disease, stroke, and other health issues. Therefore, it is essential for individuals to read nutrition labels carefully and choose products that are low in or free of trans fats for better cardiovascular health.