Which type of fat is generally considered unhealthy?

Trans fat is generally considered unhealthy due to its association with various health risks. These fats are created through an industrial process that adds hydrogen to liquid vegetable oils to make them more solid, which enhances shelf life and flavor stability. However, trans fats are known to increase LDL (low-density lipoprotein) cholesterol levels, often referred to as "bad" cholesterol, while simultaneously lowering HDL (high-density lipoprotein) cholesterol, or "good" cholesterol. This negative effect on cholesterol levels significantly raises the risk of heart disease, stroke, and type 2 diabetes.

In contrast, other types of fats, such as monounsaturated and polyunsaturated fats, are generally recognized for their beneficial effects when included as part of a balanced diet. Monounsaturated fats, found in foods like olive oil and avocados, can help reduce the risk of heart disease by improving cholesterol levels. Polyunsaturated fats, which include omega-3 and omega-6 fatty acids, are essential for body function and also contribute to heart health.

Saturated fats are more controversial; while they can raise LDL cholesterol levels, recent research suggests that the context of the overall diet and the source of the saturated fat may influence health outcomes. Nevertheless, trans fats stand out as particularly