Music stars aren't like normal people. They train harder, diet more rigorously and indulge regularly in the most rarefied health fads. Jason Derulo, with his 10 million-selling singles and beach-ready abs, ranks among the most obsessive -- and successful.

Warm lava cake with vanilla Ice cream," says Jason Derulo. "That shit is unbelievable." For a man as obsessed with staying fit as he is with making hits - the 25-year-old is on the verge of scoring his 11th million-selling single, according to Nielsen Music, with "Want to Want Me," now at No. 8 on the Billboard Hot 100 - this ­qualifies as dirty talk. Lava cake is the food he fantasizes about most. And on this Tuesday afternoon, fantasize he must, because his menu consists of tuna straight from the can, water and a couple of ­spoonfuls of energy powder.

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