BTW, carbs (grains mostly and sugar) are very easy and cheap to grow and produce.
You just have to be a smart shopper. Fresh meats and green vegetables. Fresh fruit but not to much at a time. Butter rather than margarine (but not too much). Whole grain bread when you eat bread. Brown rice when you eat rice. I drink water or coffee. When you do eat starchy carbs, keep the portions small. Avoid fast food. Cook at home rather than eat out as much as possible. Avoid all processed foods. If it comes in a bag or box it's probably best avoided. (except for a bag of pistachios - I do like pistachios and they are good for you.