1: Do you even know what the purpose of body fat is?
2: This just sounds like a shitty version of psionics, combined with intermediate Sierrensa practices.
3: True. Few people in the RP can use the art of Shaping, but many, many can use Psionics, which seems to me to be quite a better alternative, since it doesn't require constant concentration or the use of one's own chemical energy.