Want to eat healthy and also save the planet? Anna Grummon has the diet for you.

And it doesn't involve replacing your steak with a carrot stick, she says.

"We’ve identified simple, achievable substitutions – small changes – that can still produce a meaningful impact,” said Grummon, an assistant professor at the Stanford University School of Medicine in Palo Alto, California.

She is the lead author of a new study about the diet published Thursday in the peer-reviewed British journal Nature Food. Other campuses involved in the study include Tulane University in New Orleans and the Harvard University T.H. Chan School of Public Health in Boston.

If universally adopted, the recommended changes would lower the nation's dietary carbon footprint by more than 35%, while also raising diet quality by as much as 10%, according to the study. "This change might sound small, but it’s large enough that it could help prevent diet-related diseases like heart disease and diabetes," Grummon told USA TODAY.

Simple substitutions

A drastic change in your diet isn't necessary to make a significant difference, the study found.

Making simple substitutions, such as switching from beef to chicken or drinking plant-based milk instead of cow’s milk, would help both the planet and your health.

“It’s really a win-win,” Grummon said, in a statement. “If you are a person who wants to make a dietary change for either health or environmental reasons and you make the changes that we propose, you’re likely to see the benefits you want.”

Indeed, the diet "doesn’t have to be a whole lifestyle change,” said Diego Rose, senior author for the study from Tulane's School of Public Health and Tropical Medicine.

“It can be as simple as ordering a chicken burrito instead of a beef burrito when you go out to eat," Rose said. "When you’re at the grocery store, move your hand 1 foot over to grab soy or almond milk instead of cow’s milk. That one small change can have a significant impact.”

How do our food choices affect climate change?

"Food production accounts for about 20% of greenhouse gas emissions worldwide. This means that changing what we eat can reduce greenhouse gas and carbon pollution," Grummon told USA TODAY.

Emissions of greenhouse gases such as carbon dioxide and methane have caused the Earth's atmosphere and oceans to warm to levels that cannot be explained by natural factors.

Swapping out "high-emission" food and replacing it with "low-emission" food reduces the amount of greenhouse gases needed to grow, process, transport, distribute, prepare, consume and dispose of that food, the United Nations reports.

7,700 Americans interviewed

The study analyzed diet data from more than 7,700 Americans, identified common foods with the highest climate impact and simulated replacing them with nutritionally similar, lower-emission options.

In each of four food groups – protein, mixed dishes, dairy and beverages – researchers looked at foods that disproportionately contribute to greenhouse gas emissions that cause global warming.

The team then matched each of these environmentally unfriendly foods to a similar option with a far lower carbon footprint and calculated what the impact would be both for an individual’s carbon footprint and for the country’s if the dietary changes were made.

“The key was to find swaps that were culinarily equivalent,” Rose said. “By doing this, we think it will be pretty easy for people to adopt the new dishes because they will be pretty similar to what they are currently eating."

Top foods to swap out

USA TODAY asked Grummon if there is one specific food (or food group) that she would most recommend people swap out of.

"The good news is that there are many options for small changes to make to reduce your carbon footprint and improve your diet," she responded. "We found that replacing beef with poultry or vegetarian items was particularly impactful, but other options include replacing juice with whole fruit and replacing dairy milk with nondairy milks like soy or almond milk.

"People might also want to know that you don’t have to make these changes all the time to make a difference – even replacing just one serving per day or one serving per week can add up to meaningful benefits," she added.