Jacko 'must beef up' for comeback gigs

Michael Jackson has been instructed to bulk up for his forthcoming comeback concerts, a report claims.

The 50-year-old singer was recently informed that he is "too fragile" to go ahead with the gigs in his current state because his BMI is too low, according to The Mirror.

An insider told the newspaper: "Docs are worried he won't have the strength to perform. He's been told to drink protein drinks called Metric to beef up."

Jackson announced an initial ten live dates at London's O2 arena on March 10.

He later confirmed a total of 50 concerts following unprecedented interest from fans.