Board Thread:Theories and Speculation/@comment-3568954-20170503123318

i have a theory, in naruto we are told chakra is the combination of two energies 1 physical and 2 spiritual. we are told to increase said energy you train the individual parts, by training the body one increases the energy that each cell releases and that by training the mind you increase the spiritual energy as well. but here is my theory.

when a shinobi works out their body, there body burns through energy and they have a calorie deficit. in order to restore there energy they will have to eat food to replace the calories which will in turn be transformed into energy to fuel them. i believe the most logical assumption is that the physical energy in their body is simply the exess calories being converted into physical energy. the akamitchi clan simply found a way to capatalize on this by creating their calorie control ability which allows them to store up fat in their body and then when they need to they can convert the fat back into calories and then transform it into physical energy therby increasing their chakra. when they want to increase in size, they do so by transforming chakra back into calories, then from calories into an increase in actual size. what this all comes down to is that all shinobi should learn calorie control, if i was a shinobi and knew calorie control i wouldn't store it in the body as fat though, i would instantly transform it into chakra

this theory is backed up by the fact that when naruto shared his and kurama's chakra with everyone, choji got fat again and choji responded with the question of Is this Chakra calories or something along that lines. this also means that a shinobi should be able to survive without food for longer amounts of time by simply converting chakra into calories  