A nation-wide analysis of U.S. grocery purchases reveals that highly processed foods make up more than 60 percent of the calories in food Americans buy, and these items tend to have more fat, sugar and salt than less-processed foods.
“Many Americans have strongly held opinions and beliefs about processed foods,” said Jennifer M. Poti, Ph.D., research assistant professor at the University of North Carolina at Chapel Hill and leader of the research team conducting this study. “Some consider processed foods to be tasty, convenient and affordable choices while others contend that the combination of sugar, fat, salt and flavouring in these foods promotes overeating and contributes to obesity. But until now, we didn’t really have the evidence needed to settle this debate: No prior studies have examined whether highly processed foods collectively have a worse nutritional profile than minimally processed foods, using nutrition information and ingredient lists specific for barcoded food and beverage products.”
From 2000 to 2012, the researchers asked 157,142 households to use UPC barcode scanners to record all foods and beverages they purchased from grocery stores for at least 1 year. Although items without barcodes were not included, Poti points out that packaged produce such as bagged lettuce or pints of berries can be scanned. Households participated in the study for an average of four years and collectively purchased 1.2 million items. The research team then linked each item to its nutrition information, product description and ingredient list, allowing them to rank each product’s degree of food processing.
The researchers classified products as highly processed if they contained multi-ingredient, industrially formulated mixtures. They labeled foods such as soda, cookies, chips, white bread, candy and prepared meals as highly processed foods and categorized fresh or frozen fruits and vegetables, milk, eggs, dried beans and fresh meat as unprocessed or minimally processed. The investigators also examined convenience, distinguishing between foods that are ready to eat, ready to heat or require cooking and/or preparation. Candy and chips are examples of ready-to-eat foods, and frozen meals are a ready-to-heat food.
“Overall, we found that not only are highly processed foods a dominant, stable part of U.S. purchasing patterns, but also that the highly-processed foods that households are purchasing are higher in fat, sugar, and salt, on average, compared to the less-processed foods that they buy,” said Poti, who will present these findings at the American Society for Nutrition (ASN) Annual Meeting during Experimental Biology 2015. “The unshifting dominance of ultra-processed and ready-to-eat foods as major calorie contributors to U.S. diet and their poor nutrient profile support the need to incentivise food manufacturers to improve the nutritional quality of their products.”
The analysis revealed that from 2000 to 2012, the proportion of calories in highly processed food and beverage purchases by U.S. households remained stable at 61.0 to 62.5 percent. The researchers noted a significant increase in the proportion of calories purchased in ready-to-heat foods, which reached 15.2 percent in 2012. More than 80 percent of calories were purchased in ready-to-eat or ready-to-heat form in 2012, and these tended to be higher in fat, sugar and salt than food purchases that required preparation.
The researchers continue to track purchases to see how nutrition and level of processing might change over time. They are also using the data to examine whether purchasing habits vary based on race or socio-economic status.
Poti said that she also hopes this study can lead to a more careful use of the term processed food. “It is important that when we discuss processed foods, we acknowledge that many processed foods, such as canned vegetables or whole-grain breakfast cereals, are important contributors to nutrition and food security,” she said. “However, it is the highly processed foods, those with an extensive degree of processing, that might potentially be related to obesity.”
There is burgeoning research showing that co-consuming cooked whole eggs with your veggies can increase carotenoids absorption. With the recent scientific report from the 2015 Dietary Guidelines Advisory Committee lessening past concern over cholesterol in eggs, this is particularly good news.
“Americans under consume vegetables, and here we have a way to increase the nutritive value of veggies while also receiving the nutritional benefits of egg yolks,” said Wayne Campbell, Ph.D., Professor of Nutrition Science, Purdue University.
Campbell, working with postdoc fellow Jung Eun Kim, Ph.D., R.D., conducted a study to assess the effects of egg consumption on carotenoid absorption from a raw mixed-vegetable salad. Sixteen healthy young men ate three versions of the salad, one with no egg, one with 1.5 scrambled whole eggs, and another with 3 scrambled whole eggs. Those who ate the highest egg amount with the salad of tomatoes, shredded carrots, baby spinach, romaine lettuce, and Chinese wolfberry, increased absorption of carotenoids 3-9 fold. This is a very significant effect, said Campbell. The carotenoids found in the salad include beta-carotene, alpha-carotene, lycopene, lutein, and zeaxanthin, the latter two being found in egg yolk as well.
The research grew out of his group’s previous study showing that by adding certain oils to mixed raw vegetables, the consumer experienced enhanced absorption of carotenoids.
“Next time you visit a salad bar, consider adding the cooked egg to your raw veggies,” said Campbell. “Not only are lutein and zeaxanthin available through whole eggs, but now the value of the vegetables is enhanced.”
The research findings will be presented at the American Society for Nutrition’s Annual Meeting during Experimental Biology 2015. Campbell believes the beneficial effects seen in this college-age population will extend to all populations and ages. His group would like to expand their research to explore the effects on other fat-soluble nutrients including vitamin E and vitamin D.