Blood test to tell how long you’ll live? Not so fast
By Hygeia | Thursday, May 19th, 2011A recent article by Rachael Rettner originally published in My Health News Daily and on msnbc.com discussed how some researchers say a gene test can measure the aging process including how long an individual will live, whole other experts say these are false claims. Read the article below to see what both sides are saying.
By Rachel Rettner. Researchers in Spain say they’re close to marketing a genetic test that could tell consumers how fast they are aging and, potentially, how long they will live. But experts say that such claims are false.
The Independent, a British newspaper, reported Monday that scientists are developing a blood test that would measure the length of an individual’s telomeres, or caps on the tips of chromosomes that protect the chromosomes from damage. Telomeres are thought to play a role in aging, and previous studies have found an association between telomere length and lifespan.
The test would tell an individual if their “biological age” — the age of their cells — matches their chronological age, the Independent reported. This information, in turn, might tell a person how many years of his or her life remain. The researchers hope to market their test to the general public later this year, sold by the company Life Length.
Estimating biological age
However, experts argue that the scientific understanding of telomeres is not at the point where such a test would be accurate. We know telomere length changes with age, said Carol Greider, a geneticist at John Hopkins School of Medicine in Baltimore who studies telomeres. But in the general population, the length of people’s telomeres varies widely. A 20-year-old and a 70-year-old might have telomeres that were the same length, Greider said.
“We cannot tell how old a person is by looking at their telomeres,” Greider told MyHealthNewsDaily. In addition, you can’t tell someone they have the cells of a 50-year-old, even though they’re 20, she said. “I would say that it is not possible to tell a persons ‘biological age’ from their telomere length,” Greider said. If a test says it will tell you how long you will live “clearly that’s not true,” she said. (more…)










