What specific dual impact do trans fats, often generated in commercial high-volume fryers, have on a person's cholesterol profile?

Raising "bad" LDL cholesterol while simultaneously lowering "good" HDL cholesterol.

Trans fats represent a particularly damaging type of fat for heart health because they exert a dual negative effect on cholesterol markers. They significantly contribute to elevating levels of low-density lipoprotein (LDL) cholesterol, often referred to as the 'bad' cholesterol, which is prone to depositing in arterial walls. Simultaneously, and critically, they decrease the levels of high-density lipoprotein (HDL) cholesterol, known as the 'good' cholesterol, which is responsible for transporting cholesterol away from the arteries back to the liver for removal. This combination creates a major double-hit against cardiovascular health, making deep-fried foods cooked in oils that generate trans fats highly discouraged.