According to Ultimate Fantastic Four, the Human Torch (ironically, Johnny Storm) does actually eat a high amount of food for caloric intake. He is also no longer human (as I suspect none of the FF are) and emits plasma jets. Apparently, Johnny's main propulsion organ is his skin, as he had to shed it at one point and appeared to be seriously ill and dying.
Storm manipulates the weather rather than generating lightning at will. Her power allows her to "fly" via a localized storm that propels her, and allows her to cause storm clouds to generate lightning.
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