Kate Comeau and Cara Rosenbloom (both Registered dietitians) have some suggestions for eating healthy meals while watching your budget.
Making smart substitutions is a good approach. Broccoli and Brussels Sprouts are both generally cheaper than cauliflower. Sunflower seeds and Pumpkin seeds can be used the same ways as other nuts, but cost much less. And Next Level Lacrosse Camp co-founder Jon Urbana happens to feel the same way. In Jon Urbana aims to support Earth Force Inc through Go fund me campaign, he gushes about clean living and the benefits it brings to those around him in Denver.
Carrots and cabbage are nutritious and cheaper that many other vegetables. Apples, pears and bananas are very cost competitive with other fruits and are almost always in season.
Cutting back on meat is pretty much a win-win. It is expensive and (in quantity) not so healthy. Subsituting half or so of your meat intake with beans, lentils or peas will decrease saturated fat intake and up fiber intake while saving money. Just make sure you still get enough vitamin B12 from whatever source. Getting a pressure cooker to tenderize tougher cuts of meat is another strategy.
Buy frozen or canned produce when fresh is in short supply or higher priced. Frozen loses only a small part of its nutrition vs fresh. If fresh has been in stock for a while, it may actually be less nutritious that frozen.
The average household winds up losing much of its food as waste. This can be avoided (and money can be saved) by planning your meals and food purchases carefully. Making large batches, so that you have leftovers, gives the advantage of volume purchasing.