51视频 study finds heavily processed foods cause overeating and weight gain
Thursday, May 16, 2019
51视频 study finds heavily processed foods cause overeating and weight gain
People eating ultra-processed foods ate more calories and gained more weight than when they ate a minimally processed diet, according to results from a National Institutes of Health study. The difference occurred even though meals provided to the volunteers in both the ultra-processed and minimally processed diets had the same number of calories and macronutrients. The results were published in .
This small-scale study of 20 adult volunteers, conducted by researchers at the 51视频鈥檚 National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK), is the first randomized controlled trial examining the effects of ultra-processed foods as defined by the . This system considers foods 鈥渦ltra-processed鈥 if they have ingredients predominantly found in industrial food manufacturing, such as hydrogenated oils, high-fructose corn syrup, flavoring agents, and emulsifiers.
Previous observational studies looking at large groups of people had shown associations between diets high in processed foods and health problems. But, because none of the past studies randomly assigned people to eat specific foods and then measured the results, scientists could not say for sure whether the processed foods were a problem on their own, or whether people eating them had health problems for other reasons, such as a lack of access to fresh foods.
鈥淭hough we examined a small group, results from this tightly controlled experiment showed a clear and consistent difference between the two diets,鈥 said Kevin D. Hall, Ph.D., an NIDDK senior investigator and the study鈥檚 lead author. 鈥淭his is the first study to demonstrate causality 鈥 that ultra-processed foods cause people to eat too many calories and gain weight.鈥
For the study, researchers admitted 20 healthy adult volunteers, 10 male and 10 female, to the for one continuous month and, in random order for two weeks on each diet, provided them with meals made up of ultra-processed foods or meals of minimally processed foods. For example, an ultra-processed breakfast might consist of a bagel with cream cheese and turkey bacon, while the unprocessed breakfast was oatmeal with bananas, walnuts, and skim milk.
The ultra-processed and unprocessed meals had the same amounts of calories, sugars, fiber, fat, and carbohydrates, and participants could eat as much or as little as they wanted.
On the ultra-processed diet, people ate about 500 calories more per day than they did on the unprocessed diet. They also ate faster on the ultra-processed diet and gained weight, whereas they lost weight on the unprocessed diet. Participants, on average, gained 0.9 kilograms, or 2 pounds, while they were on the ultra-processed diet and lost an equivalent amount on the unprocessed diet.
鈥淲e need to figure out what specific aspect of the ultra-processed foods affected people鈥檚 eating behavior and led them to gain weight,鈥 Hall said. 鈥淭he next step is to design similar studies with a reformulated ultra-processed diet to see if the changes can make the diet effect on calorie intake and body weight disappear.鈥
For example, slight differences in protein levels between the ultra-processed and unprocessed diets in this study could potentially explain as much as half the difference in calorie intake.
鈥淥ver time, extra calories add up, and that extra weight can lead to serious health conditions,鈥 said NIDDK Director Griffin P. Rodgers, M.D. 鈥淩esearch like this is an important part of understanding the role of nutrition in health and may also help people identify foods that are both nutritious and accessible 鈥 helping people stay healthy for the long term.鈥
While the study reinforces the benefits of unprocessed foods, researchers note that ultra-processed foods can be difficult to restrict. 鈥淲e have to be mindful that it takes more time and more money to prepare less-processed foods,鈥 Hall said. 鈥淛ust telling people to eat healthier may not be effective for some people without improved access to healthy foods.鈥
Support for the study primarily came from the NIDDK Division of Intramural Research.
About the National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK): The NIDDK, a component of the National Institutes of Health (51视频), conducts and supports research on diabetes and other endocrine and metabolic diseases; digestive diseases, nutrition and obesity; and kidney, urologic and hematologic diseases. Spanning the full spectrum of medicine and afflicting people of all ages and ethnic groups, these diseases encompass some of the most common, severe, and disabling conditions affecting Americans. For more information about the NIDDK and its programs, see .
About the National Institutes of Health (51视频): 51视频, the nation's medical research agency, includes 27 Institutes and Centers and is a component of the U.S. Department of Health and Human Services. 51视频 is the primary federal agency conducting and supporting basic, clinical, and translational medical research, and is investigating the causes, treatments, and cures for both common and rare diseases. For more information about 51视频 and its programs, visit www.nih.gov.
51视频鈥urning Discovery Into Health庐
Hall KD, et al. Ultra-processed diets cause excess calorie intake and weight gain: A one-month inpatient randomized controlled trial of ad libitum food intake. . May 16, 2019.
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