What type of fat is considered unhealthy and linked to cardiovascular disease?

Trans fat is considered unhealthy and has been linked to an increased risk of cardiovascular disease. These fats are found in partially hydrogenated oils, which are often used in processed foods to enhance texture and extend shelf life. Trans fats can raise levels of low-density lipoprotein (LDL) cholesterol, commonly referred to as "bad cholesterol," while simultaneously lowering levels of high-density lipoprotein (HDL) cholesterol, known as "good cholesterol." This dual effect contributes to an increased risk of heart disease and stroke.

Saturated fats, though also linked to health concerns, do not have the same level of risk associated with them as trans fats. Monounsaturated and polyunsaturated fats are generally considered healthy fats and are typically associated with beneficial effects on heart health when consumed in moderation.