Woman Loses 110 Pounds in 2 Years

— -- Being overweight has been a lifetime struggle for Hanna Preston.

At her heaviest, the self-proclaimed overeater weighed 265 pounds, but came to a turning point during her junior year of high school.

“All of my friends were trying on their prom dresses and they felt so confident and just loved their dresses and I just longed for that,” Preston, 20, told “Good Morning America.”

Preston became more determined than ever, and embarked on a two-year, weight-loss journey. At the end of it, she had lost 110 pounds.

To maintain her weight loss, Preston, a college student from West Bridgewater, Mass., has made major changes to her diet and lifestyle.

“In the morning I have overnight oats," she said. "For lunch I like to have salads with all different kinds of veggies and then, for dinner, I like to have chicken with different sliced tomatoes, maybe some feta, different marinades."

Preston doesn’t belong to a gym, but she walks three miles a day, works out to videos and uses a ThighMaster -- a device designed to work thighs and made famous by actress Suzanne Somers -- on her arms.

“I find it works very well,” she said, laughing.

Preston acknowledges that the journey hasn’t been without its challenges.

“I do have my off days, but it's important to get right back on track and understand that your off day doesn't define your weight-loss journey,” she said.

Preston now has a self-confidence she never had before.

“I've heard from so many people that they're inspired by my story and that just builds my confidence so much more knowing that I was able to help somebody just even think about,” she said, “or take the first step in their own weight-loss journey.”

Preston says she is now at her goal weight of around 155 pounds and is not trying to lose more weight. She is though, she says, still constantly challenged by her journey towards better health.

"With reaching my goal I have found new goals where I would like to become a little bit stronger, work on running rather than walking," she said. "It's just a journey and it's going to take some time to get used to."