In an exclusive clip from the upcoming season premiere of “7 Little Johnstons,” Trent Johnston reveals some devastating news about his health — he has white matter disease, a condition that normally impacts older people.

“White matter disease is basically dead brain tissue from a lack of oxygen,” Johnston said in the episode.

Last season, Johnston underwent an MRI, and doctors suspected he might have had multiple sclerosis. He also learned that his brain resembles that of an 81-year-old, meaning the 49-year-old has experienced significant brain tissue loss.

Johnston shared some insight into what may be causing his health troubles. His white matter disease is likely from years of not treating his sleep apnea properly.

“I have had some form of sleep apnea my entire life, and I have not b

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