Couch Potatoes Age Faster

A British study released last month revealed that people who are physically active in their free time may be biologically younger than couch potatoes.

The study's author, Lynn F. Cherkas of Kings College London, said that a sedentary lifestyle increases a person's risk of aging-related diseases and premature death. According to Cherkas, inactivity may diminish life expectancy not only by predisposing to aging-related diseases, but also because it may influence the aging process itself. Researchers monitored the physical activity levels, smoking habits and socioeconomic status of 2,401 white twins. The researchers also collected DNA samples from participants to study a particular marker of a person's biological age.

The study, which was published in the Jan. 28 issue of the Archives of Internal Medicine, revealed that the DNA markers of those who were more active in their leisure time showed they were aging less rapidly than those who were less active, despite differences in body-mass index, smoking, socioeconomic status and physical activity at work, according to the study's authors.

Based on the DNA analysis, those who were significantly active could be expected to live about 10 years longer. According to the study's authors, the DNA differences could possibly be related to damage caused to cells by exposure to oxygen and inflammation, or chronic stress.

If you don't have a regular exercise regimen, start with a simple goal of walking 30 minutes per day. Once your body becomes accustomed to the new habit, it will be easier to add more intensive exercise to your daily routine.