I think the easiest, most important thing of these tips is to cut out soda. That shit is just liquid sugar, and that excess sugar will make you fat and maybe even diabetic.
And if 'fermented vegetables' doesn't sound very appealing, just try baby carrots, they're nice and crunchy like chips
The problem is you can cut back and only slow down the weight gain or just break even. Need to be in an actual deficit to lose weight which in my experience involves feeling hungry and dealing with it.
To add to this, it gets easier over time too. Your body starts to get used to not eating so much, so you don't feel as hungry, and if you manage to cut down on the fast food intake if you're lucky it'll start making fast food taste kinda hollow.
I don't really have a better word for it. I started to cook and go the decently sized portion route. You can eat an entire stuffed oven roasted chicken breast with a big plate of roasted veggies (with various seasonings to taste - I like garlic powder and red chilies) and feel comfortably full after, for the same amount of calories a big Mac meal would have been. And you actually feel full, and like you're not loading your body with crap calories that slow you down.