Not even sure how food falls under disposable income. Sounds like a cute way of saying "after-tax income" as if "things to buy otherwise you die" is a luxury"?
From the chart after the one you quoted:
"In 2021, households in the lowest income quintile spent an average of $4,875 on food (representing 30.6 percent of income), while households in the highest income quintile spent an average of $13,973 on food (representing 7.6 percent of income)."
Pretty cool/sad to see the top 20% spending almost 3x/household on food.
The top 20% might have a disproportionate amount of family of 4+ with kids in their teenage years and parents in their highest earning years.
The bottom 20% might disproportionately be senior citizens collecting Social Security with no kids.
Also, top 20% are living in more expensive regions than bottom 20%. Lots of conflating factors to tease out that would result in 3x not being the correct multiple.
To quote them:
>U.S. consumers spent an average of 11.3 percent of their disposable personal income on food in 2022
[1] https://www.ers.usda.gov/data-products/ag-and-food-statistic...