Khloe Kardashian‘s body is out for more than just revenge.

In fact, the 40-year-old is one of the world’s slowest agers—a revelation she learned after taking a blood test to determine her body’s biological age compared to her calendar age.

“This is exciting news for you,” Dr. Matthew Dawson of TruDiagnostic, the company that performed the test, told Khloe during The Kardashians‘ season five finale on July 25. “There’s a global competition on self-rejuvenation. And right now, you would be No. 7 in the world.”

According to the genomics doctor, Khloe’s “pace of aging is .72” on the epigenetic clock, making her biological age 28. Meanwhile, her 43-year-old sister Kim Kardashian‘s biological age was determined to be 34.

“Kim is livid,” Khloe quipped in her confessional. “The world needs to know that me—the fat one—is now better than the best one.”

The former Revenge Body host—who admitted to eating cheese pizza and cereal all the time—added with a laugh, “The fat, funny sister is 12 years younger than her chronological age.”