Renewal Quotes (157 quotes)
Do You Really Have a New Body Every 7 Years?
every cell i our body is replaced every seven years
Apologies if I have put this in the wrong forum, couldnt see anywhere in biology where this was quite right I often hear various permutations of the statement that every atom in your body is different after a period of x years. Is there an authoritative source for this? Secondly, surely there has to be a positive probability that some of the atoms in your body are the same after x years even if it is in acompletely different place Thirdly I am sure I read that after a certain age the body does produce any new brain cells, so presumably this means that for the 7 year rule to be true it must be somehow rebuilding the same cell? This is very different to what was said on "start the week" on BBC's Radio 4 this morning by a philosopher I think called Julian Baggini who claimed all the body was replaced No, the 7 year rule is not true.
By Gaia Vince. Think carefully before you reply. The correct answer, it turns out, is about 15 and a half. You might think that you have been around since the day you were born, but most of your body is a lot younger. That may come as no surprise. In some tissues — skin and blood — we know how long it takes, for example from seeing how long transfused blood cells last. Surprisingly, however, we have no idea how often most cell types are replaced, if indeed they are replaced at all.
Izzie - You may have heard that we get a whole new body on a cellular level every seven years. A fresh start? Yes please! Your cells are the fundamental building blocks of your body. You have about 37 trillion of them and around different types.
Table 1: Cell renewal rates in different tissues of the human body. Values are rounded to one significant digit.
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Forgot Password? It's a beautiful idea, when you think about it: You can leave the old you behind and become a completely new person every seven years. Unfortunately, it's just not true. Chances are you can't actually remember where you heard this, but the truth is that the seven-year myth isn't even a rough average of every cell's lifespan. To understand how often your cells replace themselves, you need to understand how cells come into being in the first place. Your body can make new cells in a couple of ways. First, existing cells can divide via a fairly simple process called mitosis.
The cells in the superficial or upper layers of skin, known as the epidermis, are constantly replacing themselves. This process of renewal is basically exfoliation shedding of the epidermis. But the deeper layers of skin, called the dermis, do not go through this cellular turnover and so do not replace themselves. Thus, foreign bodies, such as tattoo dyes, implanted in the dermis will remain. Bridenstine of the department of dermatology at the University of Pittsburgh Medical Center adds: "Our skin is primarily made of the protein collagen, which is produced by cells known as fibroblasts. When the skin or any other tissue, for that matter is wounded, the wound-healing process initiates the generation of new fibroblasts to produce scar collagen, which is different from the collagen in normal skin.
Know yourself; love yourself; be true to yourself. These old adages have been batted around throughout the years by a whole cross section of artists, entertainers and philosophical types, from John Paul Sartre "We only become what we are by the radical and deep-seated refusal of that which others have made of us" to Bob Dylan "If you try to be anyone but yourself, you will fail" to Katharine Hepburn "If you always do what interests you at least one person is pleased". But how do you get to know yourself when you are constantly changing? Whether it's shedding skin, renewing the lungs or growing new hairs, the human body is in constant flux. According to researchers, the body replaces itself with a largely new set of cells every seven years to 10 years, and some of our most important parts are revamped even more rapidly [sources: Stanford University , Northrup ].