Article continues below advertisementOprah Winfrey uncovered the exact number on the scale that ignited her weight-loss journey.During the Tuesday, January 13, episode of TODAY With Jenna & Sheinelle, the media legend, 71, described what her "enough point" was.Endocrinologist Dr. Ania Jastreboff defined an "enough point" as "how much energy, how much fuel, how much fat your body wants you to store."Article continues below advertisementSource: TODAY With Jenna & Sheinelle/YouTubeOprah Winfrey guest-starred on 'TODAY With Jenna & Sheinelle.