"I had gained about 35 pounds," Lorraine told ET. "I was really a tub-ola."
The 60-year-old actress had a tragic wakeup call that forced her to turn things around.
"[My parents] both passed nine days apart," Lorraine said. "What was rough was they were ill and they suffered, and when they passed and I buried them, I made a vow to myself I would do everything to stay healthy."
It was the death of her co-star and friend James Gandolfini that inspired her to write the book.
"Jimmy was a decade younger than me," Lorraine said of her late Sopranos co-star, who died June 19, 2013 in Rome at age 51. "I was shocked by his death I really was it shook me to my core."
While her No. 1 goal is to stay healthy, Lorraine isn't above a purely aesthetic makeover. She advocates plastic surgery in some cases and has even had some work done herself.
"Who doesn't want to get plastic surgery?" Lorraine said. "I've had some of the greatest plastic surgery ever. I've had mini liposuction. It made a huge difference. It took away those huge jowl things. I was very happy with that."