Final answer:
Trans fats are created by hydrogenating vegetable oils, leading to negative health effects such as increased bad cholesterol. Due to their associated health risks, including coronary heart disease, trans fats have been banned from some restaurants.
Step-by-step explanation:
Explaining Trans Fats and Their Ban
Trans fats have been banned from some restaurants due to their negative impact on human health. Trans fats are made by adding hydrogen to vegetable oil through a process called hydrogenation, which increases shelf life and flavor stability of foods. However, this chemical change transforms the natural cis form of unsaturated fats to the trans form, altering the properties of the lipid. Trans fats are known to increase LDL ('bad' cholesterol) and decrease HDL ('good' cholesterol) levels in the blood, contributing to the risk of coronary heart disease. Because of these dangerous health effects, there has been a push in public health policy to eliminate trans fats from food products.