According to the American Heart Association, fat substitutes are "ingredients that mimic one or more of the roles of fat in a food. " Common ones are these:
http://www.faqs.org/nutrition/images/nwaz_01_img0095.jpgFrom what I understand, fat substitutes are meant to mimic the sensory effects of real fat. Production began on these fat substitutes when people became concerned about heart disease and how much fat they were consuming. They demanded something that could taste just as good as fat without the detrimental effects. Some are used because they are stable even when heated. Some are used because they work better for liquids.
Though I understand that fat intake is a legitimate concern, it is also something not to be afraid of and something that is in your control. We are recommended to have 30% of our diet come from fat, any more and any less has shown to be deleterious; trans and saturated fat are to be avoided. I don't believe in using something fake because you can't control your eating habits; I choose butter over margarine. Also, there has been research indicating that people who eat fat substitutes still crave real fat thereby consuming more calories than they intended to.
So, don't be afraid of consuming fat. You should definitely be conscious. Don't go crazy with the bacon, leche flan, pork rinds, junk food etc. but you are absolutely allowed to enjoy a sumptuous, creamy sauce on salmon or chocolate gelato.
In health,
Lauren
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