human bodies shed their cells constantly, according to recent studies yes, even the neurons get totally replaced, a couple of years in literally 100% of all molecules are different.

So if there's some truth to the theory that the brain is quantum, and some unknown effect of quantumnes, it would be a strong argument in favour of materialism, if you keep something that say belonged to your grandfather, you may be influenced by its quantum properties, making it even more likely that you receive his traits even that if he were speaking to you, because your grandfather is 100% different molecules from his youth, but his hammer's molecule, minus a few ones lost are 100% exactly the same