Americans raced to the stores and bought every single roll of toilet paper on the planet. As we settled into the daily grind of the pandemic, our grocery-store shopping habits continued to evolve. A new survey published by C+R Research shows the changes.

Sadly, the most dramatic change of all: Of the more than 2,000 people surveyed, 19 percent said they had witnessed a verbal altercation at a grocery store, and 11 percent said they had witnessed a physical altercation. Eight percent said they had been a participant in a verbal altercation, and 8 percent also said they had been a participant in a physical altercation.

Yes, people are stressed. But here’s the thing: The survey was taken on March 27 and 28. That was less than two weeks after things started shutting down, and in less than two weeks, nearly one in five of us had seen people get into an argument at a grocery store, and one in 12 (OK, 12½) had been in a verbal or physical fight.

Perhaps the problem is anxiety. Sixty percent of those surveyed reported being fearful to shop at a grocery store, and 60 percent (it may well be the same 60 percent) said they feel a sense of anxiety or panic when they shop.

Most of us -— but not all of us — also are making fewer trips to the grocery store than we did before the onset of the coronavirus. Of those surveyed, 73 percent said they are going less often, while 15 percent said they are going more.

The people surveyed were making an average of 2.3 weekly trips to the grocery store before the virus; that number has dropped to once a week now.

With fewer trips, spending per trip is up, from an average of $159 per trip pre-COVID-19 to an average of $184 now. If those amounts seem high to you, or low, remember that these figures are averages; some people are buying for large families, some just for themselves.

There may be another reason the amount of money per trip has gone up: Half of the people surveyed said they saw price gouging, and 48 percent said they had paid more for certain items.

What is that money spent on? Forty-seven percent said they have changed their eating habits. Of those, 47 percent said they are eating more processed foods (20 percent said they are eating less processed foods). Thirty-six percent are eating less produce, while 21 percent are eating more. And 14 percent said they are eating more meat and poultry, while 26 percent are eating less.

Not surprisingly, grocery deliveries have increased three-and-a-half times, while online orders have increased two-and-a-half times. Even so, only 58 percent of us feel safe handling items from delivery drivers, and 47 percent of us disinfect items once they have been delivered. Fifty-nine percent have stopped ordering takeout and delivery altogether.

And I took a survey of my own: One hundred percent of us will be glad when this whole thing is over.