Amber tells People that she was plagued by chronic stomach pains last July, prompting her to see a doctor. "I decided I was going to make a change and eat healthier," she says.
The singer/actress chose to cut out fast food and burgers, which she says "were attacking my stomach." Now, it's clear that the seven months of hard work has paid off. "I'm a lot more comfortable in dresses, especially gowns," she adds.
The costume department at 'Glee' has had to take in many of Amber's clothes and buy new items for her wardrobe. Still, as happy as she is about her new healthy bod, the TV star says she's always been confident about herself.
"I've always been comfortable with my size," she insists. "I just decided it was time to get healthy."