One thing that I suspect is that labor costs are going up. I understand people feel that wages aren't keeping up with inflation but wages are also going to continue to drive inflation. One thing that's always struck me as strange, is when I was young I remember food co-ops being a thing and farmers selling direct to consumers through the co-ops or other farmer markets. Those prices were always significantly less than what you would pay at the stores. There was still big box stores that could keep low margins. Walmart still existed large grocery chains existed, etc... now anytime I see a local farm stand or a farmers market or any co-op-based thing the prices far outpace what you get at even the most boutique grocery stores. Often times a lot of these farmers markets are simply selling repackaged goods from these grocery stores too.
I suspect the drive for all of this is that we have artificially inflated our food price at the supply level and it is now trickling down to everyone. The massive amount of subsidies we pay out to farmers and the massive amount of money that is spent to artificially keep prices high and the tariffs that are issued against imports of foreign foods all drive these crazy price increases. The fact that farmers feel like they need new tractors every few years and that big companies like John Deere have betrayed their customer base by blocking right to repair and the government has done nothing. That seed companies have taken over the agricultural industry and want to license the use of seed instead of selling it. And if you've ever engaged in one of those license agreements for seeds woe be unto you if you try and take a non-licensed seed because you will be sued.
I think if we want to really address the food price problem we need to start fixing some of the core agricultural problems. Cuz I don't believe it's with the food brands themselves it starts much earlier in the chain.