Among those whose family income was less than or equal to 130% of the federal poverty line (which was set at $11,770 for a single person or $24,250 for a family of four in 2016), 31.7% ate fast food on a typical day.
For example, while about 32 percent of lower-income folks ate fast food daily, more than 36 percent of middle-income consumers had fast food on a given day, as did 42 percent of those with higher incomes, the report found.
When it came to gender, men were most likely to buy fast food for lunch, while women would purchase it as a quick and low-cost snack.
African-Americans are the most likely to eat fast food, followed by Caucasians, then Hispanics and Asians consuming the least.
The study suggested that fast food consumption tends to dwindle with age, as that number fell to under 38 percent for those in their 40s and 50s.
Additional reporting provided by Newsy affiliate CNN.
When asked to recall what they had eaten in the past 24 hours, about 45 percent of consumers in their 20s and 30s reported having eaten fast food over the past day.
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"Most fast food is not good for our bodies", said Liz Weinandy, a registered dietitian at Ohio State University's Wexner Medical Center.
Fast food is on the menu all day long. Reading over the report, she said, "On any given day, over one-third of Americans consume fast food - that's a lot of Big Macs and pizza". Released Wednesday, the report compares the percentage of fast-food eating adults for demographic characteristics such as age, race and income level between the years 2013 and 2016.
Fast food consumption also varied by sex.
"There is no reason to completely avoid fast food, but it shouldn't be consumed regularly", she said.
"Adults can go to the grocery store more and prep food to take on the go so we don't have to get in a situation where we need to rely on fast food so much", she said.
"It is amusing, when we see news clips of a shark swimming near a beach, it scares us into not going near that beach".
"We do know that fast food advertising has gone up during that time by pretty large amounts".
She adds that it's also up to primary care physicians to talk their patients about the dangers of eating too much fast food.
Find out more about healthy eating at the American Heart Association.