But do you know what healthy eating looks like getting ENOUGH calories for your body without purging them (vomiting, exercise, laxatives, etc.)?

4 mi with no elevation is still work and still purging. If you power walk it, you will get it in around 1 hr. which is more exercise than you need at this point. I exercise on flat, flat, FLAT land and still burn a lot of calories if I walk 4 mi and need to eat extra to make up for it. If I walk longer than 4 mi. I need to eat beyond extra, 2500 cal + per day to just maintain my weight. And this is all power walking on flat land (albeit warm 80F+ with high humidity, often around 80%).