Updated

Consumer Reports found something unusual when it was doing a test on the best Greek yogurts.

Nutritionists reviewing the nutritional labels on 27 popular Greek yogurts—in plain and vanilla flavors—noticed that Whole Foods’ 365 Everyday Value Fat Free Plain Greek Yogurt claims to have only 2 grams of sugars per 8-ounce cup.

That seemed really low compared with other plain Greek yogurts they'd looked at, which had 5 to 10 grams of sugars per cup.

So Consumer Reports tested 6 samples and found that the Whole Foods yogurt averaged 11 grams of sugar—more than 5 times the label’s claim.

A spokesperson for Whole Foods says that Consumer Reports’ findings are not consistent with the test results it has gotten from reputable third-party labs. It is investigating the matter and says it will take corrective action if any is warranted.

Consumer Reports pointed out that yogurt naturally contains sugar, so even plain yogurts and those made with non-nutritive sweeteners such as stevia and sucralose have some sugar.

The Whole Foods yogurt received a “Good” rating In Consumer Reports taste tests, but others scored much better.

In the end, Fage Total 2% Fat was the top rated plain Greek yogurt. It’s thick and creamy with a well-balanced flavor.

Among the Greek vanilla yogurts, Wallaby Organic Whole Milk is the best in the tests.