Debra Messing has been showing off a new frame as of late, a change the 45-year-old credits with a very simple shakeup in her eating habits. 

"About two to three years ago, I made a very, very big change the way I approach nutrition," she told ABC. "I think it made a big difference in how I look or at least how I'm perceived to look."

Messing says that she was inspired to make the lifestyle shift not because she felt overweight, but because she felt constantly tired. 

"I lost like 20 pounds," she says. "It wasn't my intention, that wasn't why I made the change. I made the change because I was just tired all the time. For a long time, I just accepted that was the plight of a working, single mother. You're juggling everyday."

The "Smash" star reveals that she "grew up on fast food and candy" and rarely incorporated vegetables into her diet. [They] were not a part of my life at all," she added. 

Today, it's very much the opposite. 

"I'm just eating really, really clean healthy foods," she said. "Obviously I knew there was an association between what I ate and whether I gained 10 pounds or lost 10 pounds, but it never really became a reality for me that it shows on the outside in your hair and skin and even the clarity of your eyes. I was just stubborn."

Messing adds that her new healthy habits now includes a morning green juice with "kale and spinach and celery and ginger and lemon and cucumber. At least I know I'm starting my day and getting a big shot of nutrients that I need. I start out strong."

Messing can next be seen as a homicide detective in the upcoming series "The Mysteries of Laura." 

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Michael d'Estries ( @michaeldestries ) covers science, technology, art, and the beautiful, unusual corners of our incredible world.

Debra Messing reveals her healthy secret to 20-pound weight loss
Actress says she made the change because she needed more energy to juggle her career and motherhood.