Give Now

Earth Eats: Real Food, Green Living

Tipping The Scales: How Obesity Influences Planetary Health

A team of researchers looks at the ecological impacts of a human population that's growing in more ways than one.

standing on a scale

Photo: puuikibeach (Flickr)

In North America, 73.9 percent of the population is overweight or obese. Compare that with 24.2 percent of people in Asia -- the world's slimmest continent.

When people think about environmental sustainability, they immediately focus on population. Actually, when it comes down to it, it’s not how many mouths there are to feed, it’s how much flesh there is on the planet.

That’s according to Professor Ian Roberts, co-author of a recent study from the London School of Hygiene and Tropical Medicine.

The obesity epidemic, it seems, is just as much of a burden on the planet as an exploding population.

Global Heavyweights

Not surprisingly, obesity rates vary widely across the globe. In North America, 73.9 percent of the population is overweight or obese. Compare that to 24.2 percent in Asia, which is the world’s slimmest continent.

Using data on body mass index (BMI), height distributions and population counts, the researchers calculated total human biomass, biomass due to overweight (defined as BMI >25) and biomass due to obesity (BMI >30) for each country. A small number of countries were excluded from the analysis due to lack of available information.

A Huge Tragedy Of The Commons

Looking solely at food consumption, the group estimated the additional energy required for earth’s expanding waistlines.

If global biomass increases so that all countries have the same BMI distribution as the United States, the energy required to sustain the additional heft would be roughly equivalent to the energy demands of 473 million extra people of healthy size.

But not all wealthy countries appear to have the same obesity problems as the United States.

“The Japanese example is quite strong. Average BMI (Body Mass Index) in USA in 2005 was 28.7. In Japan, it was 22. You can be lean without being really poor, and Japan seems to have pulled that off,” asserts Roberts.

The Rise Of Car Culture

Going down the list of heaviest countries, you find that nations like Kuwait and Egypt are not far behind United States.

In a recent interview with NPR, Roberts theorized, “What’s common between those is actually the price of gasoline is very low. So where gasoline is really cheap, we over-consume it, it’s bad for the environment and actually because we should be using food energy for human movement. If we use gasoline for human movement, then we store the food energy and you know where we store it.”

The researchers also point out that a rise in caloric demand means that more fossil fuels are used to produce and transport food. In the future, they plan to quantify how carbon emissions relate to overweight populations.

Read More:

Amanda Solliday

Amanda Solliday is a reporter for WFIU/WTIU News and a news anchor on WFIU’s Morning Edition. She has won awards for radio news reporting from Public Radio News Directors Incorporated (PRDNI) and the Society of Professional Journalists (SPJ). You can follow her on Twitter @AjSolliday

View all posts by this author »

What is RSS? RSS makes it possible to subscribe to a website's updates instead of visiting it by delivering new posts to your RSS reader automatically. Choose to receive some or all of the updates from Earth Eats:

Support For Indiana Public Media Comes From

About Earth Eats

Search Earth Eats

Earth Eats on Twitter

Earth Eats on Flickr

Harvest Public Media