I walk 10 km every day, no exceptions. (I still do this) I had a banana + coffee w. skimmed milk for breakfast. I had a plate of 2/3 heavy vegs (e.g. carrot, cabbage) 1/3 protein for lunch. I had ONLY one serving of whatever we were having for dinner. No alcohol, beer, crisps, candy at home - ever. When we went out I drank and ate whatever everyone else did.
Those are the broad strokes. Feel free to ask any questions you might have.