Which type of dietary fatty acid does NOT increase serum LDL cholesterol production?

Monounsaturated cis fatty acids are known for their health benefits, particularly in relation to cholesterol levels. Research indicates that they do not significantly raise serum LDL (low-density lipoprotein) cholesterol production, which is often referred to as "bad" cholesterol. Foods that are rich in monounsaturated cis fatty acids include olive oil, avocados, and nuts. These fats can help reduce LDL cholesterol levels while potentially increasing HDL (high-density lipoprotein) cholesterol, which is considered beneficial for heart health.

In contrast, other types of fatty acids, such as saturated fatty acids and trans fatty acids, usually have a more detrimental effect on cholesterol levels, leading to increased LDL cholesterol and a higher risk for cardiovascular disease. Monounsaturated trans Ω-9 fatty acids may have varying effects but typically are not associated with the same positive impact on cholesterol as their cis counterparts.

Thus, the characteristic of monounsaturated cis fatty acids in not contributing to increased serum LDL cholesterol production highlights their advantage in dietary fat choices for cardiovascular health.