Ok, I do this mainly. It’s a much nicer way to eat, but more time consuming and you have to be more organized. I gained a little weight because the food tastes nicer, oops!
Carbonated soft drinks: Replace with water, milk, iced tea, smoothies, or occasionally fruit juice. My friend bought a sofa stream and makes her own carbonated water mixed with fruit.
Replace Sweet, fatty or salty packaged snacks: trail mix, home made cheese straws, home made kale crisps, cooked chicken strips, veg sticks with hummus or other home made dips, cubed cheese.
Candies (confectionery). Dried fruit and nuts, toasted seeds, a small amount of high cocoa content chocolate, home made energy balls.
Mass-produced packaged breads, buns
Cookies, cakes. Replace with home made (yes the hassle of making means you eat less of them but they are more of a treat). 
Margarine and other spreads. Use butter, oil and duck or goose fat for roasting potatoes.
Sweetened breakfast cereals. Mix your own museli and add your own sugar or honey, or make own granola, make porridge, own pancakes, etc. or have poached egg on toast instead.
Sweetened fruit yoghurt. Buy plain yoghurt and mix in fruit, honey, nuts of your choice.