News Release

New research shows trend toward unhealthy eating during pandemic

Study participants consumed more vegetables and whole grains before COVID-19 began

Peer-Reviewed Publication

American Society for Nutrition

Sample question

image: The researchers administered a COVID survey in July and August of 2020 and compared the results with responses from the 2018 food group questionnaire, before the pandemic began. A sample question is shown. view more 

Credit: Caroline Um, American Cancer Society

Rockville, Maryland (June 7, 2021) -- As COVID-19 spread throughout the world, our daily routines and behaviors changed drastically. A new study of more than 2,000 people in the U.S. found that the pandemic has also affected how we eat. The authors found a decrease in the consumption of many food groups, particularly healthy foods such as vegetables and whole grains, compared to before the pandemic.

"When the pandemic began, we saw panic buying, problems in the food supply chain, increases in food prices and rising unemployment rates," said Caroline Um, PhD, a postdoctoral fellow at the American Cancer Society. "All these factors can affect access to food, and we wanted to find out if and in what way people's diets were changing."

Um will present the new findings as part of NUTRITION 2021 LIVE ONLINE, a virtual conference hosted by the American Society for Nutrition (ASN).

"We were surprised to see decreased consumption for a lot of the healthy foods," said Um. "This decrease was the most pronounced among women, black and Latino study participants, and participants who gained at least five pounds or more since 2018."

The new research was based on participants in the Cancer Prevention Study 3 (CPS-3), which enrolled over 300,000 men and women from across the country beginning in 2006. Starting in 2015, participants completed surveys every three years that assessed diet through a validated food frequency questionnaire or a food group questionnaire. In 2020, the researchers enrolled 2,335 participants in a pilot test for a new online portal for the CPS-3 study that included a COVID survey.

"We were already planning to launch this online portal, but when the pandemic began, we decided to incorporate a new COVID survey," said Um. "In addition to asking about the consumption of major food groups, the survey also asked about other COVID-related aspects such as how the pandemic has affected their physical and mental health, access to healthcare, and financial security."

The researchers administered the COVID survey in July and August of 2020 and compared the results with responses from the 2018 food group questionnaire, before the pandemic began. Interestingly, most participants indicated that they thought their consumption of all the food groups included in the survey had not changed during the pandemic, showing that perception doesn't always match up with calculated results.

The researchers note that the pandemic isn't yet over and there are still many factors affecting food availability and access for many Americans. "It's possible that the shift in consumption of fewer healthy foods will continue," said Um. "This could raise the risk of gaining weight and thus increase risk for various chronic diseases."

Um adds that it is important to gain a better understanding of why these changes are occurring and why they may be more pronounced in certain populations so that interventions can be developed to stop the shifts toward unhealthy eating and to prevent this from happening in the future should a similar situation ever occur again.

The researchers are continuing to follow up with study participants to understand how diets continue to change. They are also planning studies that will examine specific psycho-social factors -- such as mental health or financial stressors -- that might be involved in the changing eating behaviors.

Um will present this research on-demand at NUTRITION 2021 LIVE ONLINE during the Recent Investigations of Public Health Nutrition and COVID-19 in Developed Countries session from noon on Monday, June 7 through 5:30 p.m. on Friday, June 10 (abstract; presentation details).

Image available.

Please note that abstracts presented at NUTRITION 2021 LIVE ONLINE were evaluated and selected by a committee of experts but have not generally undergone the same peer review process required for publication in a scientific journal. As such, the findings presented should be considered preliminary until a peer-reviewed publication is available.



NUTRITION 2021 LIVE ONLINE, held June 7-10, 2021 is a dynamic virtual event showcasing new research findings and timely discussions on food and nutrition. Scientific symposia explore hot topics including clinical and translational nutrition, food science and systems, global and public health, population science and cellular and physiological nutrition and metabolism. #NutritionLiveOnline

About the American Society for Nutrition (ASN)

ASN is the preeminent professional organization for nutrition research scientists and clinicians around the world. Founded in 1928, the society brings together the top nutrition researchers, medical practitioners, policy makers and industry leaders to advance our knowledge and application of nutrition. ASN publishes four peer-reviewed journals and provides education and professional development opportunities to advance nutrition research, practice and education.

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