Final answer:
Partially hydrogenated oils, which contain trans fats, are produced during hydrogenation.
Step-by-step explanation:
The industrial process of hydrogenation produces partially hydrogenated oils, which can be found in some deep fried restaurant foods; packaged cookies, crackers, and other baked goods; some margarines; and shortening.
Hydrogenation is used to make oils semi-solid at room temperature, creating spreadable margarine and shortening from inexpensive ingredients like corn oil.
However, partially hydrogenated oils contain trans fats, which have been shown to increase levels of LDL cholesterol and may lead to heart disease.