The Red Line is a twist on some seasons of The Biggest Loser. It is below the yellow line and one person will fall below it, in addition to the two people falling below the yellow line. If someone falls below the Red Line, they are automatically eliminated, with Alison Sweeney directly telling them "(name), I'm sorry but you are not The Biggest Loser". There is no voting with people who fall below the Red Line, they must leave the show. There is still an elimination with the Yellow Line during these episodes, bringing the episode to 2 eliminations. There is usually not more than one Red Line in a season.

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