During March, National Nutrition Month, it’s worth taking another look at the Agriculture Department’s My Plate, the daily food plan tool unveiled in June. It shows that a quarter of a typical healthy plate should be filled with grains — at least half of them whole grains.

Eating more whole grains, the USDA says, can help reduce the risk of certain diseases. Folks at the Harvard School of Public Health take it a step further, saying that whole grains should fill up the entire quarter of our plates.

Whole grains include barley, corn, oats, rice, rye and wheat (bulgur, farro and spelt are wheat grains). They contain the entire kernel with its nutritional parts: the bran (outer layer), endosperm (inner) and germ.

Fortunately, finding whole grains is easier than ever as more and more products contain 100 percent whole grains. And some very old grains are being reintroduced to new generations.

Grains such as amaranth, farro and quinoa are called ancient grains because the strains have been around for thousands of years.

Not only are they showing up in more recipes, they’re becoming more widely available on grocery store shelves.

“The focus on eating more whole grains has meant that there are even more options to the consumer,” said Bethany Thayer, wellness director at Henry Ford Health System in Detroit and spokeswoman for the Academy of Nutrition and Dietetics. “We are not limited to whole wheat. You have whole-grain options like farro and spelt.”

It takes a conscious effort to make sure half of the grains you consume are whole.

Don’t be swayed by what’s on the front of the package. “You need to look at the ingredients list,” Thayer said. The first ingredient should be a whole grain, such as whole wheat, whole rye or quinoa.

“Increasing whole grains can be as easy as swapping out enriched flour with whole-wheat flour in your recipes,” Thayer said. “Depending on the recipe, you may want to mix half enriched flour with half whole-wheat flour.

When you have a choice, opt for whole grains.

“For breakfast, choose whole-grain cereals such as Wheaties, oatmeal or whole-grain toast. For lunch, make your sandwich with whole-grain bread, and at dinner choose a brown rice pilaf or whole-grain pasta,” said Kathleen Poore, registered dietitian and a program specialist with the Ann Arbor VA Health System. “And choose popcorn for a tasty whole-grain snack.”

Ancient grains

These three so-called ancient grains are gaining new lives.

Amaranth

What it is: These tiny yellowish seeds were a staple of the Aztecs. Not a true grain, it has the nutritional profile of a cereal grain.

Best nutritional aspect: Gluten-free, rich in vitamin B and a source of vitamin E, high in protein and a source of good fat.

Best uses: Pilafs, hot cereals, cold salads. Use amaranth flour in breads, cookies and pancakes.

Farro

What it is: A whole- wheat grain originally cultivated in the Middle East, it is known as the grain consumed by the Roman Empire. It has a nutty flavor and chewy texture.

Best nutritional aspect: High in protein, vitamins and antioxidants. Twice the fiber of wheat.

Best uses: In cold salads or in side dishes mixed with roasted vegetables. Use like Arborio rice to make risotto or soups.

Quinoa

What it is: A South America native, quinoa consists of tiny, disc-shaped grains. It has the highest protein of any grain and a nutty flavor. Not a true grain, it has the nutritional profile of a cereal grain. You can buy quinoa in regular, red, black or mixed styles.

Best nutrition aspect: Known as a complete grain because of its high protein, high calcium and high amino acids. A 1⁄2 cup serving has 5 grams of fiber.

Best uses: Cold vegetable salads, including potato salads, and soups. In side dishes, add other vegetables, including roasted asparagus and squash.

Sources: www.wholegrainscouncil.org; “The New Whole Grains Cookbook” by Robin Asbell.