Matthew McConaughey may have gone too far last fall after losing weight for the upcoming film Dallas Buyers Club.
A source close to the actor tells In Touch, on newsstands now, "Matthew lost nearly 50 pounds and toward the end he started to lose his eyesight," while playing an AIDS patient in the film, due out later this year.
Matthew immediately consulted doctors, “who confirmed that when you starve yourself you begin to lose your vision.” Thankfully, it wasn’t permanent, the insider tells In Touch. “They monitored him, and things are back to normal now.”

Matthew McConaughey's Determined: I Will Be Buff Again!

And now that his weight is on the upswing, he no longer has to worry about regaining his once buff physique— he's doing it the healthy way.

“The real health challenge is when you put [the weight] back on because it's very easy to create a form of diabetes if you don't do it right,” says Matthew, who originally confessed that he couldn’t wait to bite into a juicy po-boy once filming had concluded. “But I can't just start eating cheeseburgers and ice cream because my body will go into shock and it just won't work."

For more, pick up this week’s issue of In Touch, on newsstands now!

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