Julie Chapon was 26 when she finally learned what was in her Nestlé Fitness cereal.
“I’d eaten this cereal for 10 years,” by 2016 said Chapon, and she considered it to be healthy. “When I checked the label, one quarter of this product was made with sugar,” she recalls. “That’s when we realized we can’t trust the brand and the marketing.”
So Chapon conceived Yuka, a smartphone app that gives users X-ray vision into the health impacts of 6 million foods and cosmetics.
Scan a barcode and the app will show you a detailed breakdown of a product’s ingredients based on Nutri-Score, a food labeling system developed by scientists, as well as the presence of additives and organic certification. (Nestlé did not respond to requests for comment. Fitness cereal has been reformulated since Chapon’s encounter.)
Yuka rates each product with a simple color code: Excellent (green), good (light green), poor (yellow) or bad (red). More than 80 million people, including 25 million in the United States, have used the app to scan groceries or personal care products since it launched in 2017. Yuka said it has 20 million active users worldwide each month and is financed almost entirely by user subscriptions: Premium users pay at a rate they can afford, between $10 to $50.
The consulting firm BCG coined the term “Yuka Effect” to describe how the app shapes what goes in — or stays out — of shopping carts. Yuka says survey data suggests 94 percent of its users put products back on the shelf after the app shows them low scores. That’s helping to pressure manufacturers to reformulate products to score better, despite objections from some experts that the app oversimplifies complex diet decisions.
In France, where Yuka says one in three citizens have signed up since its launch, the app appears to be acting as an unofficial food regulator. The supermarket chain Intermarché, noting the app’s influence, has reformulated more than 2,300 private-label products, removing controversial additives, reducing sodium levels and slashing added sugars.
When France’s charcuterie industry sued Yuka for defamation and unfair business practices regarding its warnings about nitrites, it lost on appeal. Preserved meat producers are now removing nitrates and nitrites from their recipes without a regulatory mandate.
Yuka, now available in 12 countries, says it is signing up over 25,000 users per day in the United States, where it has been embraced by everyone from average shoppers to leaders of the MAHA movement. Health and Human Services Secretary Robert F. Kennedy Jr. has told reporters that he uses the app.
That’s adding to pressure on consumer packaged goods manufacturers to change their products. Sales of ultra-processed foods have slowed or contracted, according to BCG, and researchers are calling them a “clear global threat to our health.” Public officials, using the same legal strategies once used against the tobacco industry to target Big Food, have sued major food companies for precipitating a public health crisis by engineering and marketing ultra-processed foods.
Some U.S. brands are already trimming sugar, salt and additives to cross Yuka’s scoring thresholds, such as moving from a red to yellow rating, said Lauren Taylor, who leads BCG’s research into consumer markets, although few have announced it publicly.
By making nutrition, additives and processing levels instantly visible at the point of purchase, Yuka is influencing product standards without needing to change the law and quietly reordering R&D priorities across the industry.
“Regulation moves the floor.” Taylor said. “Consumers, enabled by transparency tools, move the ceiling.”
That’s now central to Yuka’s mission, Chapon said. Merely offering shoppers the power to make an informed choice wasn’t enough, because few healthy options existed in many categories. “So our approach evolved,” she said, prompting the company to add a “Call-Out” feature that allows shoppers to ask brands to remove additives and free tools to help manufacturers reformulate their products. “Yuka is not only about informing consumers,” she said. “It’s also about shifting the market.”
The backlash against ultra-processed
A modern American grocery store carries about 31,800 different unique products. Good luck finding the healthy ones outside the produce aisles: 73 percent of the American food supply is “ultra-processed,” estimates Giulia Menichetti, senior research scientist at Northeastern’s Network Science Institute. These industrial formulations are engineered for maximum shelf-life and “hyper-palatability,” she wrote.
“Food manufacturers have actually figured out what the bliss point is in ultra-processed foods,” said Tara Schmidt, a registered dietitian at the Mayo Clinic, referring to the precise ratio of salt, sugar, and fat that overrides people’s sense of feeling full, so they keep eating.
Not all processed foods are unhealthy — breads, pasta, frozen vegetables, for example — and most are fine in moderation. But more than half of all calories consumed by Americans now come from ultra-processed food, which is associated with higher rates of obesity, diabetes, mental health disorders and certain cancers, as well as a 50 percent higher risk of dying from cardiovascular disease.
That makes what we eat the leading cause of death in the U.S., Schmidt said, responsible for an estimated 500,000 deaths annually from poor diets.
Two decades ago, David Katz, a doctor, medical researcher and founding director of the Yale-Griffin Prevention Research Center, tried to tackle the same problem. His company, NuVal, which debuted in grocery stores in 2007, rating foods on a nutritional quality index of 1 to 100. It was supposed to help shoppers trade up. “In every supermarket, there is a pasta sauce with more added sugar than ice cream per calorie,” Katz said. “Right next to it is a pasta sauce with no added sugar. The average shopper has no clue.”
NuVal scores were eventually displayed on products in more than 1,600 grocery stores. Kroger agreed to roll them out after a pilot — then canceled the program. Years later, Katz said, he heard from a former Kroger employee that NuVal was canceled at the behest of PepsiCo. Major food brands, which pay grocery chains for favorable shelf displays, were typically ranked poorly for soft drinks and chips. A PepsiCo spokesperson did not answer questions about the incident, but said “the company uses science‑based standards and regulatory guidance – not any single app – to inform our product decisions.” Kroger declined to comment.
NuVal folded in 2017. Katz now says it was a mistake to only work with supermarkets. “We needed to put this in the hands of consumers,” he said.
Does Yuka work?
Yuka displays a simple score based on nutritional quality (60 percent of a food’s score), additive risk (30 percent), and organic certification (10 percent). It sets limits — such as sugar, sodium, saturated fat and calories — and offsets them with positive elements such as fiber, protein and the proportion of fruits and vegetables. Yuka’s toxicology and nutritional experts rely on published studies, especially the Nutri-Score, a nutritional assessment adopted by several European governments.
Even as someone who reads food labels, the app changed how I shop. First, I scanned my pantry. Some snacks (oh, crackers) were ranked worse than I expected, while other foods proved far healthier (Tasty Bite’s Indian food pouches). On grocery runs, I could instantly assess the ingredients of almost any item and browse for better choices steps away.
Some recommendations struck me as silly: My jar of mayonnaise was predictably rated red for being high in saturated fat and calories, as were most indulgences. But I was no longer guessing about obscure ingredients. Just how bad is disodium phosphate, anyway?
While Yuka’s scores are easy to follow, some scientists and dietitians contend they oversimplify the notoriously nuanced question of what is “healthy.”
Dariush Mozaffarian, a Tufts University cardiologist and director of its Food Is Medicine Institute, faults Nutri-Score as relying on “outdated science,” such as penalizing some healthy fats, while lacking evidence it leads individuals to eat meaningfully better over time. “It’s not terrible,” he said, “but I don’t think it’s great.” (Mozaffarian has helped develop his own nutritional index called the Food Compass).
Other food experts say Yuka unhelpfully demonizes additives that can be dangerous at high doses but are usually present in tiny amounts. Some may not be “high-risk” at all: Yuka puts MSG in that category, despite scientific bodies from the FDA to WHO declaring them safe in typical amounts after multiple randomized controlled studies.
Schmidt of the Mayo Clinic said Yuka’s focus on specific additives can be misleading. “It’s rarely about the individual ingredient,” she said. “Look at the rest of your diet before we demonize these foods. … All foods can fit.”
Yuka’s Chapon said the company has submitted its scoring system and behavior change research to peer-reviewed journals and expects users to learn how to maker better choices, rather than completely cutting out sweets and snacks.
Better choices may be on the way. When I contacted 13 leading U.S. food brands and grocery retailers, none would confirm whether they had reformulated products to meet the app’s standards.
But Yuka has said companies such as Nestlé and Unilever have already done so, with more likely. “We are contacted almost daily by U.S. brands seeking to reformulate their products and asking how they can improve their Yuka score,” Chapon said.
Yuka is still unlikely to end Americans’ appetite for sweet, salty and ultra-processed food. Nor does it intend to. “The right approach to nutrition isn’t telling people to stop eating pizza or cookies,” said Chapon. “If you want to eat a pizza, there is a better choice. There is always a better choice.”
There will always be unhealthier choices, too. McKee Foods, maker of Little Debbie snack cakes, says it has no plans to reformulate, despite its products’ “poor” ratings on Yuka.
“There is no need,” wrote Mike Gloekler, a spokesperson for McKee. “The vast majority buy our cookies and cakes because they love them as they are.”







