How Many Servings of Whole Grains Should You Eat a Day?

We’ve been told we’re supposed to eat more whole grains. What’s been less clear is exactly how much makes a meaningful difference.

New research offers a surprisingly specific answer: somewhere around four to six servings a day may be a useful target for heart and metabolic health.

A new systematic review and meta-analysis combined results from 87 clinical trials involving more than 6,500 people. Researchers found that eating more whole grains was associated with modest improvements across several cardiovascular risk factors, including cholesterol, blood pressure, blood sugar, body weight, and inflammation.

And while benefits appeared at lower amounts, the strongest overall results showed up around 60 to 100 grams of whole grains per day, or roughly four to six servings.

Four to Six Servings Isn’t as Much as It Sounds

Before you picture six giant bowls of brown rice, a serving of whole grains can be fairly small.

Depending on the food, a serving might look like:

• ½ cup cooked oatmeal, brown rice, quinoa, or another whole grain
• 1 slice of whole-grain bread
• ½ cup cooked whole-wheat pasta
• About 3 cups of air-popped popcorn

That means you can accumulate several servings without eating grains at every meal.

Oatmeal at breakfast, a sandwich made with two slices of whole-grain bread at lunch, and a side of brown rice at dinner could put you around the range researchers associated with the greatest benefits.

Why Your Heart Likes Whole Grains

Whole grains retain the bran, germ, and endosperm of the grain, giving you nutrients and plant compounds that are largely lost when grains are refined.

Fiber is one of the biggest advantages. Soluble fibers such as beta-glucan in oats and barley can help lower LDL cholesterol, while fiber more broadly supports digestive health and helps slow digestion.

Whole grains also provide B vitamins, minerals, and a variety of plant compounds. Researchers think the benefits come from these components working together rather than from one standout nutrient.

That’s also why swapping a refined grain for a whole one can be such an easy place to start.

You Don’t Have to Hit Six Every Day

Four to six servings shouldn’t become another nutrition quota you have to obsess over.

The researchers saw benefits beginning at lower intakes, around 30 to 40 grams per day. The four-to-six-serving range was simply where the greatest overall improvements appeared.

And there are some limitations. Most of the trials lasted only about eight weeks, so researchers don’t yet know whether all of these changes persist over years. The studies also measured cardiovascular risk factors rather than heart attacks or strokes themselves.

So this isn’t proof that eating six servings of whole grains every day will prevent heart disease.

What it does give us is another reason to make whole grains a regular part of the foods we’re already eating.

An Easier Way to Eat More

You don’t have to overhaul your meals. Look for places where a whole-grain version works just as easily.

Choose oatmeal instead of a refined breakfast cereal. Make a sandwich with whole-grain bread. Try brown rice, quinoa, barley, or farro in place of refined grains sometimes. Keep cooked grains in the refrigerator or freezer so they’re easy to add to bowls, salads, and soups.

And don’t get too caught up in hitting an exact number. The useful takeaway from this research isn’t that everyone suddenly needs six servings a day.

It’s that whole grains appear to benefit several markers of heart and metabolic health at once, and eating a little more of them may be one of the simpler upgrades you can make to your diet.