FILE - In this Aug. 14, 2012 file photo, fun. lead singer 

FILE - In this Aug. 14, 2012 file photo, fun. lead singer Nate Ruess performs at the "Teachers Rock" concert at the Nokia Theatre, in Los Angeles. Ruess said the band's successful year has taught him “that I need to take better care of myself.” The boys are up for six Grammy Awards, including the top four categories: album, song and record of the year, and best new artist. (Photo by Chris Pizzello/Invision/AP, File)
Associated Press
FILE - In this Aug. 14, 2012 file photo, fun. lead singer Nate Ruess performs at the "Teachers Rock" concert at the Nokia Theatre, in Los Angeles. Ruess said the band's successful year has taught him “that I need to take better care of myself.” The boys are up for six Grammy Awards, including the top four categories: album, song and record of the year, and best new artist. (Photo by Chris Pizzello/Invision/AP, File)
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