One teaspoon of granulated sugar equals 4 grams of sugar. To put it another way, 16 grams of sugar in a product is equal to about 4 teaspoons of granulated sugar.
Keep in mind, though, that the grams of sugar listed on the nutrition information label includes natural sugars from fruit (fructose) and milk (lactose) as well as added sweeteners like refined sugar or high-fructose corn syrup. That’s why the label on a carton of regular low-fat milk says there's 13 grams of sugar per cup. And that’s why the grams of sugar per serving in Raisin Bran (or any cereal with raisins or other dried fruit) seem unexpectedly high.
Further, many beverages that boast of being 100% juice use juice concentrate to achieve their sweet flavor. This is also reflected in the grams of sugar listed on the label.
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