Four years ago, Casey Gemmell, 37, was excited to throw her son a superhero-themed first birthday party. She ordered a plus-size Bat Girl costume from Ebay and even though it was a bit too small, she wore it with confidence.
A few days after the party, the photos were posted on Facebook.
"I thought 'That's not me, what a terrible angle,'" Gemmell, who lives in Perth, Australia, recalled. "But then another photo was posted — from a worse angle. I kept waiting for a good angle and it never arrived."
It was September 2012 and after Gemmell took some time to "feel sorry" for herself, she got serious about turning her life around. Here are the steps she took to lose 155 pounds in four years.
1. Start exercising — every day.
"I downloaded an app called 5K Runner, it specifically said it would turn anybody from a couch potato into a 5K runner in eight weeks. I thought I would prove the app wrong," she said.
Instead, the app proved her wrong and saved her life. At first, she would run for 30 seconds, and even that was a struggle.
>> Read more: The Best Apps to Help You Lose Weight
"The app encouraged me while I was exercising, and it would beep to remind me to run or walk if the app had been inactive for a couple of days. Before I knew it, I had run a 5K without stopping!"
Gemmell had lost about 40 pounds just by accomplishing her 5K goal!
2. Cut out cheese, pasta, bread and soft drinks.
"I started to change my diet by just cutting out those four specific foods and nothing else," Gemmell said. "It was a massive challenge because at 33, I had a lot of food tendencies that were hard to break."
3. Realize that quick fixes don't work.
"As soon as you get off of whatever scheme you were on, you'll gain the weight back — and then some," Gemmell said. "I decided that if I'm going to do it, I have to do it 100 percent the right way and take my time."
4. Celebrate the small things.
For Gemmell, that meant being able to get out of the car without having to swivel her body sideways. She cried the first time she went on a plane and didn't need an extension for the seat belt. She celebrated being able to fit in what she called "normal people's clothes."
To get the rest of Gemmell's tips, click here for the original story from TODAY.