If a human body was self sustaining

If a human somehow managed to change their body in such a way that self sustaining was possible and they did not need any outside sources to maintain themselves, does that mean that they cannot grow and or change?

The best example i can think of to compliment this is could a 'Skinny Guy' who changed his body to somehow create everything it needed, internally and did not rely on any outside sources, could he workout like a normal human and perhaps become a 'Buff Guy' or would the form he achieved self-sustainment with be permanent and he could never change due to the body constantly producing everything it needs to maintain its current form?

posted over 5 years ago

Deuxz‭

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