“American idol” winner Fantasia Barrino has lost 20 pounds and her late grandmother has been her motivation.

“I lost my grandmother untimely from a massive heart attack, after which I began to take notice of my habits, such as what I was eating and allowing to enter my body, and monitoring stress — as well as the fact that I want to look and feel my best each and every day,” Fantasia, 32, told PEOPLE during a recent interview.

Barrino has been consistently posting workout photos, clips and motivational messages to her fans on social media.  But don’t think working out is all she does.

In regard to her diet, Barrino says, “I have turned toward leaner meats, seafood, more vegetables, and cutting back or eliminating salts and sugars.”

For more photos of Barrino’s transformation and workout clips, check out her Instagram.