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How often are brain cells replaced and why are they replaced?

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So basically, what you're born with is what you have to make last a lifetime. And there’s a reason for that because if brain cells were dividing all over the place, remember that brain cells have long connections that they make from one cell to the other. read more

Every cell in the human body is replaced and renewed within a period of seven years, consecutively, for life. This is known as aging; it includes the brain. Not one cell a person is born with is still there when they reach seven, and again at fourteen, then again at twenty-one, etc. read more

By brain cells, I'll assume you mean neurons (the other type are called glial cells). Yes, new neurons arise in a least certain parts of the brain, and yes, they do cause memories to weaken or disappear. This has been shown in mice, guinea pigs and degus. read more

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