Added Sugar Labels Are Changing Grocery Carts

There is one line on the nutrition label worth reading, and it turns out shoppers actually do. Added Sugar Labels, which the United States made mandatory on food packaging by twenty twenty-one, are changing what lands in grocery carts, according to new research from Penn State. The study found that once the labels appeared, demand fell for higher-sugar yogurts and cookies — and the effect showed up in real checkout data, not just survey promises.

The scale of the data is what sets this study apart. The researchers analyzed national NielsenIQ retail scanner data covering twenty fifteen through twenty twenty, capturing shopping behavior both before and after the label change. The final dataset spanned more than thirty-five hundred markets, with just over three hundred yogurt products from seven major brands and four hundred thirty cookie products from fifteen brands. The team chose those two categories on purpose: shoppers think about yogurt and cookies very differently, which makes the shared pattern harder to dismiss as a quirk of one aisle.

Once the labels were updated, consumers were less likely to buy products with higher amounts of added sugar in both categories. Model simulations estimated that without the updated label, total sugar consumption would have been about four percent higher for yogurt and eleven percent higher for cookies. That is the first real-world sign that Added Sugar Labels move the market, not just minds. "Giving people clearer information about added sugar can change purchasing decisions, and it also means policymakers may have more targeted options," Yizao Liu, an associate professor of agricultural economics at the university, said. Because added sugar is now clearly identified, she noted, policy can focus on it specifically rather than treating all sugar the same way.

Why the label works

Before the change, shoppers could see total sugar on a nutrition panel but had no way to tell whether it was added during manufacturing or naturally occurring in the food. "The updated label made that distinction visible for the first time," Liu said. Added sugar covers sweeteners added during manufacturing and processing — in desserts, breads, sweetened drinks and other products — and high intake has been linked to obesity and related chronic conditions, a connection this newsroom has explored in its reporting on processed foods and heart risk. A lot of earlier research asked whether people notice or understand nutrition labels; this study asked what actually happened in the marketplace, according to the university's account of the research. That design choice is the difference between a lab promise and a checkout fact.

It also explains why the habit is worth borrowing. Two yogurts with the same total sugar can carry very different added loads, and the new line lets a shopper tell them apart in seconds. That is the kind of low-effort swap that fits how young shoppers already operate — a shift this newsroom has tracked in its coverage of Gen Z grocery spending, where tight budgets have made the cart a battleground. Reading one line beats overhauling your whole diet.

What a targeted tax could do

The team went further than labels. They also modeled a tax applied only to products with added sugar, and the result surprised them: a targeted tax reduced added-sugar consumption about as much as a broader sugar tax, while giving shoppers more reason to switch to lower-added-sugar products rather than simply buying less of the whole category. It is the kind of precision that only became possible once the labels existed — you cannot tax what you cannot measure. For policymakers, the implication is that label transparency opens up sharper tools than blunt category-wide taxes. For everyone else, it is a reminder that the information on the back of the package is load-bearing.

There is also a second-order effect worth watching. The researchers say it would be interesting to see how food companies respond — for example, by reformulating products to contain less added sugar. If manufacturers start quietly trimming added sugar to stay competitive on the new line, the shelf changes before anyone reads a thing. That dynamic has already played out in other labeling fights, where the threat of a bad label moved the industry faster than the label moved shoppers.

The fine print

The caveats matter. The study covered only yogurt and cookies, and the researchers say it would be useful to see whether the same patterns show up in other foods and over longer periods. The consumption figures come from model simulations, not direct measurement, and the data window ends in twenty twenty, so the estimates describe a counterfactual rather than a counted outcome. Still, the direction is consistent: when the label got clearer, carts got a little lighter on sugar. In short, Added Sugar Labels gave shoppers — and policymakers — a sharper tool than the old total-sugar line ever did, and the checkout data proves it.