What type of dietary fats are considered man-made and linked to heart disease?

Trans fats are recognized as man-made fats created through an industrial process that partially hydrogenates vegetable oils. This process solidifies the fats and extends the shelf life of food products. However, the consumption of trans fats has been linked to an increased risk of heart disease and other health issues because they raise levels of low-density lipoprotein (LDL) cholesterol—often referred to as "bad" cholesterol—while lowering levels of high-density lipoprotein (HDL) cholesterol, which is considered "good" cholesterol. This adverse effect on cholesterol levels contributes significantly to cardiovascular problems, making trans fats particularly dangerous.

Other types of fats, such as saturated, unsaturated, and polyunsaturated fats, are naturally occurring and have varying effects on heart health. While excessive intake of saturated fats is also debated regarding health impacts, it's the synthetic nature and specific health risks associated with trans fats that make them particularly concerning in the context of dietary fat and heart disease.