New life expectancy figures show Americans some way behind countries like Canada, the UK and Australia. Why?
Living in the world's richest country comes at a price, and it's measured in life years.
Men in the US are on average aged 75 when they die. That is 1.5
years younger than men in the UK and 3.5 years younger than men in
Australia, says a new study.
American women live on average to just under 81 - about three years younger than the average Australian woman.
While life expectancy in the US continues to improve, says the
report by researchers
at University of Washington in Seattle and Imperial College, London, it
is not increasing as quickly as in other Western countries, so the gap
is widening.
"The researchers suggest that the relatively low life
expectancies in the US cannot be explained by the size of the nation,
racial diversity, or economics," says the document, which ranks the US
38th in the world for life expectancy overall.
"Instead, the authors point to high rates of obesity, tobacco
use and other preventable risk factors for an early death as the
leading drivers of the gap between the US and other nations."
"We weren't surprised that we had
lower life expectancies than other countries, but we were surprised by
the fact that we were falling further behind," says Dr Ali Mokdad,
professor of global health at the Institute for Health Metrics and
Evaluation at the University of Washington.
Take a country like Australia, he says. "It also has a nation
of immigrants. It also is a relatively young country. It has similar
socioeconomic characteristics.
"It has an obesity problem, and yet it has continued to
improve in life expectancy and remains one of the healthiest nations in
the world."
So how should the US address these risk factors?
Smoking alone is responsible for one out of every five deaths
in the US, the professor says, yet the US has not been as tough as
Australia in restricting tobacco advertising and public smoking.
Australia also has a greater focus on primary care - which
helps with health education, and early treatment of any problems - and
it has done a good job reducing the number of road traffic accidents, he
adds.
The US could also save 100,000 lives a year by reducing salt
in people's diets, since high blood pressure kills one in six people, Dr
Mokdad says.
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Snapshot from Mississippi
"We have high rates of poverty and high rates of uninsured or
people lacking access to care. We have fewer primary care providers and
fewer physicians per person than most states. And high rates of low
education.
"We have the highest rate of obesity in the country and
therefore one of the highest rates of diabetes. A relatively high rate
of tobacco use and high rates of cardiovascular disease, stroke and
cancer.
"It's going to take a long time to make progress, but we have
40 communities that have banned indoor smoking in public buildings, and
the percentage of high school smokers is falling. In other ways, we are
making being healthy an easier choice."
Dr Mary Currier, Mississippi health officer
Then there's the big issue -
about one in three adults is classified as obese. That's about 10 times
as many as in long-living countries like Japan,
according to OECD figures.
But the US is a big country, and while parts of Mississippi
have a male life expectancy of 67, behind nations like the Philippines,
women in areas of Florida live as long, on average, as the Japanese, who
top the longevity rankings.
It is precisely this kind of inequality that goes some way to
explain why the US - and the UK to a lesser degree - lag behind other
countries, according to Danny Dorling, a professor of human geography at
the University of Sheffield in the UK.
He believes a more even distribution of wealth, even if the average were lower, could mean longer lives for everyone.
"I think stress is a part of it - this is the key thesis of
Michael Marmot and his book on the status syndrome. People get worn out
faster with greater inequality.
"However there is much more. If you have most health spending
just going on a few people who have the best health to begin with - [as
in] the US system - that is hardly efficient.
"In a more unequal rich country more doctors are working on
things like plastic surgery. More dentists whiten teeth than fix bad
teeth and so on."
Infant deaths
While it is not surprising that poor Americans lose out from inequality, Prof Dorling argues that the rich may suffer too.
Several of the world's oldest people have been from Japan
"Top income groups are badly affected because their doctors are
not necessarily mainly interested in their health but work for
organisations that have to make an income," he says.
"I am not suggesting it is deliberate but you make more money
out of a patient who spends more on many drugs and investigatory
operations than one who lives longer with less intervention.
"In a more equal system the rich who are well get less intervention - and they live longer in the UK than the US."
Growing income inequality in the UK, since the 1970s, has has
helped to push it down the European life expectancy rankings, says Mr
Dorling.
However, life expectancy is not just about forecasts made for newborn babies.
When you look at life expectancy at 65, the US does perform
well, says Svetlana Ukraintseva, research scientist at the Center for
Population Health and Aging (CPHA) at Duke University in North Carolina.
Elderly Americans have a higher chance of surviving heart
disease and many cancers than their counterparts in other rich
countries, she says. Where the US lags behind is what happens at a much
younger age. Infant mortality rates are high, she points out.
"So it's not the medical system itself that is the problem but access to it," she says.
"Medical insurance for all might help."
This is one goal of the healthcare reform signed into law in
March 2010, which will oblige American adults to have health insurance
when it comes into force in 2014.
However, this remains a controversial idea in the US and the legislation could yet come unstuck.
Challenges to the constitutionality of the law are working
their way through the courts, and fierce opponents in the Republican
Party make no secret of their desire to repeal the legislation if the
opportunity arises.