Not all whole grain foods are what they claim to be. Some contain only a small amount of actual whole grains and instead include refined flour—a pulverized version of what may, at some point, have been a whole grain. That’s a problem, because how much a grain has been milled or manipulated can also make a difference in how nutritious it is. Complicating matters is the fact that there’s no standard for telling people how much of a product — 50%, 100% — comes from whole grains.
Here are the five things you need to know about whole grains.