New Body every 9 months ?

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So ive read that its proven that every few months that every cell in your body is new they regrow so in theory u have a new body but how come we cant stay young and our skin winkles and we die shouldn't we be able to stay young and cure our selves of disesase

Is this programmed in our mind that we get old and cant cure certain disease  that our beliefs are  having an effect on our body 

Its documented that ppl with multi personalititys that when they change the personality their eye colours will change and one will have an elergic reaction and the other wont because that person beliefs them things so the body reacts to this beliefs 

Is this whats going on ?

New Body every 9 months ? | Ecency