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Tara Costa's friends, left to right, Eoin O'Neill, (Credit: Newsday Photo / Ana P. Gutierrez)

Tara Costa's friends, left to right, Eoin O'Neill, 28, Susan Hickey, 26, Lisa Buonagura, 25, and Erin Dodge, 23, watch the "Biggest Loser" finale at B.K. Sweeney's in Bethpage.

Tara Costa on 'The Biggest Loser'

Tara Costa's friends, left to right, Eoin O'Neill,
(Credit: Newsday Photo / Ana P. Gutierrez)

Tara Costa's friends, left to right, Eoin O'Neill, 28, Susan Hickey, 26, Lisa Buonagura, 25, and Erin Dodge, 23, watch the "Biggest Loser" finale at B.K. Sweeney's in Bethpage.

Tara Costa's friends, left to right, Eoin O'Neill,
(Credit: Newsday Photo / Ana P. Gutierrez)

Tara Costa's friends, left to right, Eoin O'Neill, Susan Hickey, Lisa Buonagura and Erin Dodge, watch the "Biggest Loser" finale at B.K. Sweeney's in Bethpage.

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In the 18th episode of the season, Tara
(Credit: NBC Photo)

In the 18th episode of the season, Tara and the remaining contestants ran a marathon. Tara was the first to cross the finish line in 4:55.

Tara prepares healthy food in the 17th episode,
(Credit: NBC Photo)

Tara prepares healthy food in the 17th episode, working towards the finale weigh in.

After the food and fitness trivia quiz, the
(Credit: NBC Photo)

After the food and fitness trivia quiz, the players competed in another challenge where they were suspended in the air and had to hold onto a rope. Tara eventually won the challenge.

In the 16th episode, which aired in April,
(Credit: NBC Photo)

In the 16th episode, which aired in April, Tara plays a food and fitness trivia game.

After getting a makeover from "Project Runway's" Tim
(Credit: NBC Photo)

After getting a makeover from "Project Runway's" Tim Gunn, Tara shows off the stunning results.

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In the 12th episode the contestants had to
(Credit: NBC Photo)

In the 12th episode the contestants had to pull a car, pictured, for half a mile. Tara won the challenge and won immunity.

Tara works out in the 10th episode, which
(Credit: NBC Photo)

Tara works out in the 10th episode, which aired in March.

Tara Costa competes on the eighth episode of
(Credit: NBC Photo)

Tara Costa competes on the eighth episode of the season, which aired in February. For the challenge each team member had to do ups-downs in mud. After touching the disk 100 times first, Tara eventually won.

In the sixth episode of the season, Tara
(Credit: NBC Photo)

In the sixth episode of the season, Tara is pictured with Helen, Shanon and Aubrey.

Tara competes in a challenge during the sixth
(Credit: NBC Photo)

Tara competes in a challenge during the sixth episode, which aired in February. Each contestant had to balance on a block on one foot. Mandi eventually won, Tara jumped in the pool.

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Tara is pictured with her friend, Laura, during
(Credit: NBC Photo)

Tara is pictured with her friend, Laura, during the fifth episode, which aired in early-February.

During the forth episode, which aired in January,
(Credit: NBC Photo)

During the forth episode, which aired in January, Tara competes at a football-inspired challenge.

In the first episode of the 7th season
(Credit: NBC Photo)

In the first episode of the 7th season of "The Biggest Loser," which aired in January, Tara Costa dropped from 294 pounds to 273.

Tara Costa is pictured with her teammate and
(Credit: NBC Photo)

Tara Costa is pictured with her teammate and friend, Laura. Both were previously plus-size models.

Tara Costa, pictured after losing 155 pounds on
(Credit: NBC Photo)

Tara Costa, pictured after losing 155 pounds on "The Biggest Loser." The Bethpage native came in third place overall.

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Tara Costa dropped 155 pounds in front of

Tara Costa dropped 155 pounds in front of millions of viewers and competed in "The Biggest Loser" finale on May 12. Although the top prize went to fellow "Loser" contestant Helen Phillips of Sterling Heights, Mich., Costa proved herself to be fiercely competitive and determined on the show. She remembers a time not long ago when her attitude was completely different.

Click here to read her story