With seasonal produce abounding in grocery stores and farmer’s markets, you might be inclined to fill your plate with fruits and vegetables in the summertime.

However, new research suggests there are benefits to following a vegetarian diet year-round: It might lower your risk of colorectal cancer.

A study in the May 2015 issue of JAMA Internal Medicine found that people who reported following vegetarian diets had a 22 percent reduced risk of developing colorectal cancer compared with non-vegetarians. In addition, people who added fish to a primarily vegetarian diet had a 43 percent reduced risk compared with non-vegetarians.

Salad in a Jar With Lentils and Feta Cheese

Increase your intake of plant-based foods with this recipe.

1 medium orange bell pepper, halved and seeded
1 tablespoon extra virgin olive oil
1 tablespoon red wine vinegar
1 teaspoon dried oregano
⅛ teaspoon garlic powder
Salt, to taste
Large pinch ground black pepper
1 medium (2-inch) cooked beet, cut into ½-inch cubes
¾ cup cooked green lentils
3 thin slices of red onion
⅓ cup reduced-fat feta cheese, crumbled
5 grape tomatoes, halved
2 cups baby or wild arugula, lightly packed

Position a rack near the top of the oven and preheat the oven to 500 degrees.

Place pepper halves cut-side down on a baking sheet and roast for 30 minutes, or until the skins are mostly blackened and blistered. Transfer the peppers to a small bowl, cover and set aside for 20 minutes. Peel peppers and chop them into ¾-inch pieces.

In a wide-mouth 1-quart canning jar, combine oil, vinegar, oregano, garlic powder, salt and pepper and mix with a fork. Cover the bottom of the jar with beets. Add lentils and then chopped roasted pepper. Separate onion slices into rings and make a layer. Arrange the feta on top of onions.

Place tomato halves in a circle, pressing the cut sides against the jar, leaving the feta uncovered in the center. Fill the rest of the jar with arugula, cover tightly and refrigerate for up to three days. To serve, empty the salad into a large bowl and toss with a fork.​

Reprinted with permission from the American Institute for Cancer Research.

Researchers’ findings were based on questionnaires administered from 2002 to 2007 to 77,659 members of the Seventh-day Adventist Church. Participants were asked whether and how often they ate any of 200 foods and were then categorized into five dietary groups: vegans; vegetarians who ate dairy; vegetarians who ate fish; vegetarians who ate meat occasionally; and non-vegetarians.

Eating Right

The American Cancer Society recommends following a diet that emphasizes plant-based foods and limits processed and red meat, sugar-sweetened beverages and calorie-dense foods, such as french fries, potato chips, ice cream and doughnuts; eating a total of at least 2 ½ cups of fruits and vegetables a day; and choosing whole instead of refined grains. For more guidance on following a healthy diet, meeting physical activity requirements and maintaining a healthy weight, visit the American Cancer Society's website.

Michael Orlich, assistant professor of preventive medicine at Loma Linda University School of Medicine in Loma Linda, California, and a family- and preventive-medicine physician, led the study. He says that diets high in red meat, especially processed red meat, have been associated with an increased colorectal cancer risk, while fiber-rich diets appear to lower that risk. Limiting red meat and eating fibrous foods also have been linked to less obesity; obesity has been tied to the development of colorectal cancer.

Orlich says vegetarians in the study also ate greater quantities of unrefined, plant-based foods—such as fruits, vegetables, beans, nuts and whole grains—and consumed less junk food and fewer desserts and sugar-sweetened beverages than non-vegetarians.

“The vegetarian groups are making a number of simultaneous choices” that encompass a healthy diet, he says, all of which could potentially stave off colorectal cancer.

For those interested in reducing their risk of colorectal cancer, Orlich says, in addition to limiting red meat and eating more plant-based foods, people should also consider other behaviors that contribute to health, such as avoiding refined foods and added sugar, and maintaining a healthy weight.

“These types of vegetarian dietary patterns that we identify in this study seem to capture that goal,” Orlich says.