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[–] Shekelstein6M ago 

Well electrolytes have little to do with fat. You get electrolytes by eating foods that contain minerals. Beef liver has all the electrolytes you'd ever need.

I'd say the bigger problem with having no fat is that your heart actually relies on fat to run (because relying on glycogen would make fasting impossible). Apparently that (combined with weed) is what supposedly killed Bruce Lee.

But I doubt Peterstein is so skinny. There's a set point at which your body will stop burning fat reserves and maintain homeostasis, determined by your hormones and genetics. You have to work really hard after that to burn extra fat. You use most of your energy on body heat (about 50%) and on your brain (about 20%), so once you reach your genetic body fat limit you'll simply produce less heat and sleep more.