Our physical bodies change every 7 years

(Curran Harms) #1

According to science human beings lose all of their physical parts (cells) every 7 years. Despite the change we remain the same person mentally through the change every 7 years. We remain the same person mentally beyond those 7 years because we are more than just physical matter, we are body and soul.

How would a materialist argue that they are the same person after 7 years if their cells have completely changed?

If you think about this, you could pose the question that if someone were to go to jail, according to this view, they could argue that after 7 years they are a different person and would force to be released, especially in our post-modern/post-truth era.

(SeanO) #2

@Curran_Harms The idea that our cells are replaced every 7 years is a modern myth. In fact, some cells are replaced much faster and some much slower (see below videos).

In terms of personality, what would really matter would be our neurons - and it appears there is still disagreement in the scientific community about whether or not we can form new neurons - neurogenesis.

Hope that is helpful :slight_smile:

Scientists originally believed the brain stopped making neurons at or shortly after birth. But research in the 1960s began rolling back this dogma. Emerging techniques for labeling dividing cells revealed the birth of new neurons—a process called neurogenesis—in parts of the adult rat brain. Over the next few decades scientists discovered adult neurogenesis in other species, including birds, mice and monkeys. And in a 1998 landmark study researchers reported the phenomenon in the adult human hippocampus. Another major study in 2013 corroborated those findings, estimating that about 1,400 hippocampal neurons are made daily in adult brains.

Rakic favors the idea that in primates, including humans, the absence or near absence of adult neurogenesis could help prevent disruptions to complex neural circuits. “This paper not only shows very convincing evidence of a lack of neurogenesis in the adult human hippocampus but also shows that some of the evidence presented by other studies was not conclusive,” he says.


(Curran Harms) #3

Thank you for that insight. It was very helpful.

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