Prediabetes is common in the U.S. — around 1 in 3 people have it. And many people may not know they have it.

For prediabetic people, their glucose levels are higher than people without diabetes – but not quite in the diabetic range.

"You may see higher glucose rises after certain meals," says Dr. Sarah Kim is a diabetologist and professor of medicine at University of California, San Francisco. "And you might see it go up after you eat a cherry pie…. You may see bigger changes in your glucose, whether you're sedentary versus active."

The FDA approved the first over-the-counter continuous glucose monito r last year. Since then, more people who are prediabetic or without a diabetes diagnosis have started checking in on their blood glucose levels.

Kim says while these devices may not

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