Food prices are going up, incomes generally aren't, but eating healthy on a budget is absolutely possible. Instead of reaching for fast food that might seem cheap to your wallet but comes at a cost to your body, focus on buying whole foods and cooking them at home. The Environmental Working Group's guide to Good Food on a Tight Budget gives advice on making it affordable.
Whole or cut up bone-in chicken is cheaper than boneless, so make a big batch and use it all week (sandwiches, stir-fries, soups, pasta) or freeze the extra.