A consumer group is demanding that Frito-Lay put warning labels on chips with the fat substitute olestra or face a lawsuit by a Massachusetts woman who says she got stomach cramps and had to use the bathroom quickly after eating the snacks...

experienced cramps and gas for several hours after eating Ruffles Light cheddar potato chips. Perlow said she avoided eating Wow! chips because of olestra but didn't realize Ruffles Light chips also contained the fake fat.

The consumer group contends that Frito-Lay renamed the chips last year to fool consumers into thinking the snacks didn't contain olestra.