Well it specifically says 39 per cent having trouble with food affordability in this American Progress story, to which Umair’s link is busted incidentally:

https://www.americanprogress.org/issues/poverty/reports/2018/03/07/447412/ensuring-basic-living-standards/ To quote:

“48 percent of voters report a serious problem with “finding a decent job with good wages.

• “42 percent of voters report a serious problem “paying a credit card balance.
• “39 percent of voters report a serious problem with “being unable to get medical care because of the cost.
• “39 percent of voters report a serious problem with “having too little money to buy food.
• “36 percent of voters report a serious problem with “falling behind in gas, electric, or phone bills.
• “28 percent of voters report a serious problem with “falling behind in rent or mortgage payments.

These undoubtedly overlap, i.e. it would be the same 40 per cent ticking most of the boxes every time.