"Indigestible carbs" means insoluble fiber, which is good and healthy for your system (soluble fiber is somewhat digestible, so is usually counted). The only "indigestible fat" I know of is Olestra, and it tends to cause intestinal problems. ANY indigestible fat would cause intestinal problems because if it can't be digested, it will travel through your intestines, and if you really lube up your intestines . . . .problems!
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