How often are brain cells replaced?
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. The cells are replaced, respectively, and you are a "brand new" person, however, with the same DNA structure and personality you were born with.
Memory cells can be "recycled" as some information is lost over time.
Sleep repairs and reorganizes the brain; as for new brain cell development, research shows that as one educates their mind new cells form as often as the mind is actively engaged.
EDIT - MijinLaw: The 7-year cycle is a myth. And although neurons can be generated in some circumstances, it's still unclear whether neurogenesis plays any significant role in normal learning.
Plus! Heart muscle cells aren't replaced, that's why heart attacks can be fatal, as the muscle cells which are destroyed are not replaced and may not be enough to keep the heart going. There arnt!!!!!!!!!!!!!!!
Brain cells are the only, if not one of the few, cells that are supposed to stay in your body for your entire life so they do not get replaced. Actually, research over the last few years has shown that the human brain can grow new brain cells. Particularly the ones used in cognitive memory and learning capability.
Brain cells are not replaced This is NOT true. At one time, which means there still are, people who claimed to be 'experts' believed the brain cells were not replaced, but like all self proclaimed experts, they were wrong. Current science has proven beyond any rational doubt that brain cells are replaced in healthy people who have a normal diet, just like every other cell in every other living thing that exists. NOTE: However, if…