The Hidden Added Sugar in "High-Protein" Foods

We graded 192 branded packaged "high-protein" foods on the Labelgrade v3 methodology, with every figure checked against USDA FoodData Central. Along the way we found a data gap that flatters a lot of sweetened products: USDA omits the "added sugars" line on 49% of them — and a clean-looking sugar number is often hiding cane sugar, syrup, or honey sitting near the top of the ingredient list.

The short answer

"Total sugars" is almost always on the label. "Added sugars" — the number that actually tells you whether a food is sweetened — is missing from the USDA entry on 94 of 192 products (49%). That matters because the standard way to score sugar treats a blank added-sugar field as zero added sugar. Do that, and a fruit-on-the-bottom yogurt with cane sugar as its second ingredient scores the same on sugar as plain Greek yogurt. On 37 products (19%), USDA's added-sugar line was blank and the ingredient list named a sweetener. We now count that sugar as added — which is why this report exists.

Half the database doesn't tell you how much sugar is added

This isn't a conspiracy — it's a reporting gap. Manufacturers aren't required to file the added-sugar breakdown into USDA's branded database, so it's frequently left blank even when the front of the box says nothing about being unsweetened. The result is the same either way: a sweetened food that looks, to any automated nutrition score, like it has no added sugar at all.

The sweetened foods hiding behind a blank field

These products name a sweetener in the ingredients, but USDA's added-sugar line is blank. We score the sugar as added — here's the honest grade.

The highest-sugar "protein" products on the shelf

Ranked by total sugar per serving among products that name a sweetener. The FDA Daily Value for added sugar is 50 g.

Which categories sneak in the most sugar

Flavored yogurt, ready-to-drink shakes, "protein" cereals, and sweetened bars lead the list — exactly the products that lean hardest on a protein claim. The pattern is consistent: the more a food is engineered to taste like a treat, the more added sugar rides along with the protein.

The clean categories

Not everything is sweetened. These categories carried no added sweetener at all in our data — protein arrives without a sugar passenger: Cheese, Cottage Cheese, Canned Tuna, Canned Fish. If you want protein with zero added-sugar risk, this is where to look — plain dairy, canned fish, eggs, and unflavored milk.

How we read added sugar

When USDA reports an added-sugar number, we use it as-is. When the field is blank, we check the ingredient list: if it names a sweetener (sugar, cane sugar, corn syrup, honey, agave, fruit-juice concentrate, and so on), we treat the sugars as added rather than naturally occurring — crediting a typical lactose allowance for dairy bases. The check is negation-aware: "no sugar added," "sugar-free," and "unsweetened" are never flagged. Sugar is one of six weighted dimensions in the overall grade (12%); full method at labelgrade.com/methodology.

Labelgrade is editorially independent — scores come from nutrition data and ingredient panels, never affiliate relationships. See our editorial standards.

Cite this analysis

Free to cite with attribution to Labelgrade (labelgrade.com). Writers covering nutrition labeling, added sugar, or packaged protein are welcome to use the figures above — please link to this page. For a specific cut of the data, reach us via the contact page.