And how many more people will starve? Once foodbank use is back down, and fewer people live in poverty perhaps prices could be allowed to rise. In the mean time take all that spare money you'd want to spend on groceries and donate it to a food bank. Hard working adults, and their dependents and struggling to support themselves in the skewed economy.
A better suggestion might to be to buy locally. From the farm shop (if you are lucky enough to have one, of course). This cuts out the middle men and makes sure those growing and picking the food get a better cut of the money.
Well, if we all stop using self service check outs, and scan and shop, and stop buying online, then hopefully more jobs will be available in the UK and less people will rely on food banks. If we eliminate cheap labour, this should hopefully get more people in to jobs, even if it is just picking fruit from a field. And in turn it should hopefully increase wages as businesses benefit from the increased customers.
As for buying locally, I do when I can. Living in Devon we are quite fortunate in the number of local independent shops. Likewise if I can buy fairtrade then I do. The past 12 months in particular I have been trying to not buy anything made in China, and buy goods from the UK if at all possible.
On a sidenote with regards food banks, I read an interesting article about them a while back which mentioned that its not just peoples income which causes people to use food banks, but because home economics is not taught anymore, many people dont know how to cook, so foods which cost very little, eg veg, some people just dont know what to do with it. For example, one food bank didnt want bags of potatoes, which you would think is a staple food. The reason was that people wouldnt pick any up, as they wouldnt know how to cook with them. Bags of frozen chips, microwave chips, dry mashed potato mix etc would be picked up however. I'm not saying its the case with everyone of course, and many people do know how to cook, but it did make me wonder if the lack of knowledge about how to cook basic foods thesedays is another problem.....