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.
The end of summer is a great time to get fresh berries, melon and other fruit on the cheap and freeze them for later use in smoothies, oatmeal and yogurt. The EWG suggests you prevent clumping by freezing them on a baking sheet before baggging, or pureeing them and freezing in ice cube trays.