Legendary NFL quarterback Dan Marino recently opened up about a serious health issue he has been dealing with.

Marino spoke with PEOPLE and revealed that he was diagnosed with MASH, a serious liver disease, back in 2007.

The Pittsburgh native went in for a routine checkup at the time and learned that he had MASH, also known as metabolic dysfunction-associated steatohepatitis.

"I wasn’t really working out as much as I should — because I used to work out when I played all the time and I kind of got away from that a little bit," Dan Marino told PEOPLE. “The doctors right away said that can be reversible, it can be taken care of, but, mainly for me, they were saying, like, ‘You got to work out. You got to lose weight.'"

Dan Marino has changed his lifestyle since being diagnosed with MASH

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