A Healthy Lifestyle Increases Life Expectancy by About 7 Years
A new study published in Health Affairs shows that people who refrain from engaging in risky health behaviours not only have a very long life — longer than the famously long-lived Japanese – but that most of these additional years of life are spent in good health.
The study, which analyzed data for more than 14,000 U.S. individuals, found that never-smokers who were not obese lived 4-5 years longer than the general population, and that these extra years were free of disability. The results of the analysis further indicated that individuals who also consumed alcohol moderately lived seven more disability-free years than the general population, and had a total life expectancy surpassing that of the population of Japan, a country that is often considered to be a vanguard of life expectancy.
Credit: Edwin & Kelly Tofslie/flickr
Several behaviours have a cumulative impact
“Improvements in medical technology are often thought to be the gatekeeper to healthier, longer life. We showed that a healthy lifestyle, which costs nothing, is enough to enable individuals to enjoy a very long and healthy life,” said Mikko Myrskylä.
He added: “A moderately healthy lifestyle is enough to get the benefits. Avoiding becoming obese, not smoking, and consuming alcohol moderately is not an unrealistic goal.”
This study was the first to analyze the cumulative impact of several key health behaviours on disability-free and total life expectancy. Previous studies have looked at single health behaviours. Mikko Myrskylä and his colleague instead examined several behaviors simultaneously, which allowed them to determine how long and healthy the lives of people who had avoided most of the well-known individual behavioral risk factors were.
Smoking and obesity affect health when aging
The researchers noted that each of the three unhealthy behaviours – obesity, smoking, and unhealthy consumption of alcohol – was linked to a reduction in life expectancy and to an earlier occurrence of disabilities.
But there were also differences: smoking was found to be associated with an early death but not with an increase in the number of years with disability, whereas obesity was shown to be associated with a long period of time with disability. Excessive alcohol consumption was found to be associated with both decreased lifespan and a reduced number of healthy years. However, the absence of all of these risky healthy behaviors was found to be associated with the greatest number of healthy years.
The most striking finding was the discovery of a large difference in average lifespan between the groups who were the most and the least at risk. Men who were not overweight, had never smoked, and drank moderately were found to live an average of 11 years longer than men who were overweight, had smoked, and drank excessively. For women, the gap between these two groups was found to be even greater, at 12 years.
“The most positive result is that the number of years that we have to live with physical limitations does not increase as we gain more years through healthy lifestyle. Instead, healthy lifestyle is associated with a strong increase in physically fit years. In other words, the years we gain through a healthy lifestyle are years in good health,” said Mikko Myrskylä.
“Our results show how important it is to focus on prevention. Those who avoid risky health behaviours are achieving very long and healthy lives. Effective policy interventions targeting health behaviors could help larger fractions of the population to achieve the health benefits observed in this study,” the researcher emphasized.
These results are important not only for individuals, but also for society. In an aging society, the health of the elderly determines the amount of money spent on the health system. In addition, healthy elderly people are better able to participate in the labor market and to perform social roles, such as caring for grandchildren.
The researchers used data from a long-term study conducted in the U.S., the Health and Retirement Study, which covered more than 14,000 individuals aged 50-89 over the 1998-2012 period. The participants were interviewed about their health and behaviors every two years. Those who reported having no limitations in the so-called activities of daily living (walking, dressing, bathing, getting out of bed, or eating) were classified as free of disability. The participants who had a body mass index of less than 30 were classified as not obese. Those who had smoked less than 100 cigarettes in their lifetime were considered never smokers. Men who had fewer than 14 drinks per week and women who had fewer than seven drinks per week were considered moderate drinkers.
Contacts and sources:
Mikko Myrskylä
Max Planck Institute for Demographic Research, Rostock
Citation: The Population Health Benefits Of A Healthy Lifestyle: Life Expectancy Increased And Onset Of Disability Delayed. Authors: Neil Mehta and Mikko Myrskylä HEALTH AFFAIRS 36, NO. 8 (2017)
Source: http://www.ineffableisland.com/2017/07/a-healthy-lifestyle-increases-life.html
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