I think that Olestra is what has been used in some chips. I don't believe it was ever approved for consumer use. Supposedly it is fat but the chemical makeup is such that it isn't digested but just passes through your body.
Some people have suffered, um, digestive system problems b/c of it though. I'd approach with caution. I haven't heard much about it in the last few years so it may be that it's not being used much anymore. You see more baked chips these days.
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