Question

What is the difference between hydrogenated fat and saturated fat?

Answer 1

It's just a difference of scope.

A hydrogenated fat is more general and a saturated fat is more specific. How hydrogenated is hydrogenated? At least one `"C"-"C"` bond is a single bond, or not every other bond is a double bond. Basically, it goes like this:

So essentially, a saturated fat is just a fatty acid (carboxylic acid with a long alkyl tail) with no double bonds. A monounsaturated fat has only one double bond, and a polyunsaturated fat has multiple double bonds. `omega`-N fatty acids tend to have double bond sequences that look like the depictions above.

We get this from "saturation" meaning an abundance of hydrogens, and "unsaturation" from the degree of a lack of hydrogens.