A person can shop healthy foods by creating a list beforehand, which can help reduce you from rushing items that can possibly be cheaper. Also they can read grocery magazines online or from stores to keep track of coupons and sales. Another reason is that you can do your research for healthy food item's that can either be articles to help you or videos explaining food on a budget. Adding onto the sentence prior you can research the prices of healthy food's which you may enjoy before going shopping.
Ok, so that took me awhile and I would do the rest, but I've also got a project to do and the questions are pretty simple if you think about it so don't think to hard. Write about something you'd do to be healthy and use those examples in your writing. Hope this helped and good luck! (':