This article is from the Fat-free Diet FAQ, by artemis@rahul.net (Michelle Dick) with numerous contributions by others.
The fat we are most familiar with is the triglyceride. All oils
are triglycerides. However, there are also other forms of fat that
you will see in ingredient lists. They are: lecithin,
monoglycerides, and diglycerides. These are fats just like
triglycerides and also have 9 calories per gram. Mono and
diglycerides are treated by the body in the same way as regular oil
(triglycerides). Lecithin metabolism is somewhat different.
 
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