Dwayne 'The Rock' Johnson has been "cooking" a lot less lately , and now RadarOnline.com can reveal why.

The Hollywood star recently sparked health fears after showing off his dramatic weight loss on the red carpet, and said he plans to shed even more muscle. Article continues below advertisement

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After earning rave reviews for his role as MMA fighter Mark Kerr in The Smashing Machine , Johnson is looking to challenge himself with a new role.

This time, instead of bulking up to play an ultimate fighter, the 53-year-old is shedding the pounds to play an eccentric 70-year-old named "Chicken Man" in the big screen adaptation of the Daniel Pinkwater young adult novel Lizard Music .

The plot follows the adventures of a young boy

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