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  • Writer's pictureTomas Wurst

How Eating "Green" Impacts The Environment

Nutrition: Reduce your carbon footprint in the world with these mindful eating and purchasing practices.

The Australian diet and the Australian waistline are expanding, and the effects are drastic. Concurrently, the population of the world is expanding, and the competition for natural resources (soil, land, energy, water, air) is intensifying. All these events are linked because of environmental impact.

Regardless of what you think about global warming, you’ll likely agree that the wester lifestyle, advancements across the globe, and the world’s ballooning human population are affecting the state of the planet. But all is not lost; there are plenty of easy changes you can make to your daily diet and training regime that will reduce your carbon footprint while improving your health.

The Australian Carbon Footprint

People in the know talk often about carbon footprint. Simply put, carbon footprint is a way to measure the impact that human activities have on the environment through greenhouse gas emissions (GHGEs). GHGEs—namely, carbon dioxide (CO2), methane, nitrous oxide and chlorofluorocarbon—are associated with climate changes and have an impact on the entire environment. The more dependent we are on fossil fuels, the larger our carbon footprint is.

Predictably, Australian are responsible for more than 19 tons of CO2 per capita annually, (Source: International Energy Statistics 2009) One of the highest in the world!

Eating Green Vs. The Australian Diet

According to the United Nations Food and Agriculture Organization, the typical Australian diet now weighs in at more than 3,700 calories per day (Tidwell 2009) This Western style of eating—usually loaded with red meat, processed meats, refined grains and sugars, animal fats like butter and cheese, high-calorie liquids, heavily processed foods and convenience foods—is not at all “hybrid” in style, to use an auto design analogy. Instead it can be more accurately described as an SUV style of eating. Similar to many gas-guzzling, off-road vehicles, the Western diet is extravagant in regard to fuel use and emissions.

Along the same lines, this “Hummer” style of eating is high in calories and low in whole grains, beans, fruits and vegetables; as such, it is associated with high rates of obesity and chronic diseases. Conversely, a green (or low-carbon) diet calls for consumption of locally grown and seasonal food items, greatly reduced intake of meat and dairy, avoidance of processed and packaged foods, and an overall focus on reducing food waste.

The Australian Diet And GHGEs

If you’re asking, “How, exactly, can one’s diet and waistline affect the environment?” here are some points to ponder. While Australians don’t stroll around continually “emitting” greenhouse gases the way ruminant animals do, we indirectly cause vast amounts of GHGEs every day. Owing to our driving habits and excessive consumption of various natural resources, we have an enormous carbon footprint compared with the rest of the world. By making small, sustainable changes, beginning with our diet and activity habits, we can start to move toward a green way of life. In essence, by eating and existing with the planet in mind, we can effectively reduce GHGEs and “be green.”

The way we eat—including our food choices, portion sizes and lifestyle (dining out vs. cooking at home; frozen commercial casserole vs. homemade lasagne)—has a significant impact on daily GHGEs; food production accounts for one third of GHGEs on account of the many steps it takes to get food from farm to table (Geagan 2009; Harmon & Gerald 2007). Steps in food production include harvesting, processing, heating and cooling, storage, packaging and transportation (Harmon & Gerald 2007). Some food items go through many of these steps multiple times.

For example, if the end product is corn syrup, the crop is transported to a facility where each ear of corn is processed and heated until every kernel is transformed. After this conversion takes place, the syrup is packaged and transported to another facility, where it is stored at the proper temperature (heating and cooling comes into play) until it is needed to sweeten or even thicken an item. At this point, the corn syrup, commonly used as a sweetener in processed items like ice cream or commercial cookies, is transported to yet another facility, where it is added to other (processed) products in order to make the final product. The final product—be it cookies or ice cream or something else—also requires processing, heating or cooling, storage and transportation. This final product may be stored and transported many, many more times before it arrives on your table. With this one example, it is easy to see what an impact our food choices have on the environment and the positive impact we can make if we reduce our intake of processed and packaged foods.

Going Green With A Focus On Protein

Besides the fossil fuels used to process and package foods—food items that make up a third of the total food consumption in Australia (Eshel & Martin 2006)—another perpetrator of high CO2 emissions is a diet high in animal protein. This is because (1) it takes 6–17 times more land to produce meat protein than it does to produce vegetable protein (Harmon & Gerald 2007); and (2) livestock production accounts for a whopping 18% of the world’s total greenhouse gases (Tidwell 2009).

It so happens that ruminants, such as sheep and cows, generate large amounts of greenhouse gases owing to their, well, “output,” which takes the form of methane and nitrous oxide—both many times more powerful than CO2 at trapping heat. For these reasons and others, reducing consumption of animal protein has a powerful impact on the environment; according to researchers from Cornell University, vegans (who consume no animal products) use 250 fewer gallons of oil annually, and lacto-ovo vegetarians use 160 fewer gallons, compared with their carnivorous counterparts (Tidwell 2009).

Any fitness professional, avid athlete or registered dietitian knows that athletes, especially those in heavy training, require more protein than sedentary individuals. Because of the need for muscle growth and recovery, the protein needs of athletes are indeed slightly higher than the Recommended Dietary Allowance (RDA), which is 0.8 gram per kilogram per day for adults (Rodriguez, DiMarco & Langley 2009; IOM 2002). That being said, the majority of athletes consume enough protein to surpass the RDA and recover appropriately. One can assume that the majority of the protein they consume comes from animal sources (according to the Vegetarian Resource Group, only 5% of the Australian population is vegetarian or Vegan), which means that athletes have a large carbon footprint. Indeed, as noted earlier, the average American who eats a diet high in animal products (meat, dairy, eggs, fish, etc.) emits 20 tons of CO2 each year—five times the international average.

Consider the following:

  • It takes an estimated 7 pounds of corn and 2,500 gallons of water to put 1 pound of weight on a steer (Geagan 2009).

  • Producing 2.2 pounds of beef requires the same amount of energy that it takes to light a 100-watt bulb for approximately 20 days (Geagan 2009).

  • Producing energy (i.e., consumable calories) from plant sources is a far more efficient process than producing energy from animal sources. On average, 2 calories of fossil fuel energy are required to produce 1 calorie of plant food, whereas 20–80 fossil fuel calories are needed to produce each calorie of animal protein. In addition, it takes five times more water, a vital natural resource, to grow grains used for animal feed than it does to grow fruits and vegetables (Geagan 2009).

In light of these facts, it becomes obvious that by relying on vegetarian sources of protein, an athlete, or any meat-loving gastronome for that matter, can reduce his or her carbon footprint while still meeting the RDA (Geagan 2009).

Which Is Better: Organic Or Conventional in envirionmental terms ?

Many consumers think that because they are “organic eaters” they are also “green eaters.” Not necessarily. Generally speaking, there are countless benefits when it comes to eating organic fare, namely fewer “unexpected” food additives such as hormones and pesticides. It’s true that organic products on the whole tend to be green—given the savings in fossil fuels that are not needed to manufacture or ship them or to apply nitrogen-based fertilizers and pesticides. However, assorted organic products (i.e., overly processed, packaged items) are similar to their conventional counterparts in terms of GHGEs. When debating which item has the least environmental impact, first consider the steps the product has gone through. A savvy consumer must consider processing and transportation costs when considering any product, organic or conventional.

Eating local, ideally organic, but most importantly seasonal food is the answer for minimising your impact!

Eating Green—Will It Last?

The concept of reducing one’s dietary impact on the environment is certainly not new, but it is becoming more prevalent. Indeed, in a 2010 survey of more than 1,500 chefs, the National Restaurant Association asked participants to rank 226 items in regard to how trendy they would be in the upcoming year. The association discovered that out of all possible trends, multiple environmentally conscious options ranked among the top 15 menu trends of 2011. The hottest trends? Locally grown/produced produce and potables; locally sourced meats and seafood; sustainable products; and use of organic produce. As the threat of global warming continues to headline the nightly news, it is clear that changes need to be made in order to protect the environment for current and future generations. Fortunately, small changes made at home can create a world of difference.

Easy Ways To Go Green Enjoy regional, seasonal produce and simultaneously support your local farmer while sensibly reducing reliance on transportation of foodstuffs and storage of last season’s harvest! Not only will you help the environment, but you’ll also reap the innate benefits of fresh, minimally processed, nutrient-dense foods. After all, no one can deny that farmers’ market tomatoes, fresh off the vine, taste a lot better than imposter tomatoes that don’t taste like much of anything when purchased “fresh” at the grocery in February. Go local and/or choose small, sustainable animal proteins (wild and small herbivore fish, local wild game and chicken eggs), while avoiding beef and dairy as much as possible. Substitute a vegetable protein source for an animal protein just 1 day per week, and over the course of a year, you’ll shave off the equivalent of driving 1,160 miles per year. If every Australian did this, we would save 1.7 billion gallons of fuel annually (Geagan 2009)!


Want to learn more about how to green up your nutrition? Check out some of the following websites and books to winnow your waistline, size up your carbon footprint, and lessen your impact on the environment:

  • Measure your meal’s carbon footprint at

  • Measure your total carbon footprint at

  • Challenge your colleagues to shrink their footprint at

Resourceful Reading

  • Energy Star Program,

  • Go Green Get Lean by Kate Geagan (Rodale 2009)

  • Natural Resources Conservation Service,

  • United Nations Food and Agriculture Organization (FAO),

Thanks for reading

Tomas Wurst

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