A fan favorite on NBC’s "The Biggest Loser" is being sued for allegedly putting on too much weight. TheWrap.com reports that Tara Costa has been sued by a fitness company whose complaints include the allegation that she gained too much weight to serve as an effective promoter for the company.

Costa appeared on NBC’s "The Biggest Loser: Couples 2" and lost 155 pounds. The lawsuit, however, alleges that Costa "had gained far too much weight" to make personal appearances for FC Online Marketing, which owns the Website I Love Kickboxing, the story says.

The lawsuit claims that her weight gain conflicts with their agreement, which reportedly includes an agreement for Costa to "maintain her current level of fitness and conditioning" during the pact, the piece adds.

Tara Costa