updated 1/19/2010 11:43:11 AM ET 2010-01-19T16:43:11

Weight Watchers International is suing rival weight-loss company Jenny Craig over ads it says are misleading and deceptive.

Weight Watchers, based in New York, says in the suit that Jenny Craig is running ads that refer to a study comparing Weight Watchers current weight-loss program and Jenny Craig's pre-packaged meals system.

But Weight Watchers says no such study has been done and the claims in the ads are not supported by fact or science.

The lawsuit has been filed in the U.S. District Court in New York City. It asks for an injunction and damages along with a ban of the ads.

A call to Jenny Craig Inc., based in Carlsbad, Calif., was not immediately returned.

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