Exercise, has to be viewed like a bill. You don’t have to kill yourself with it. But, you do it, every other day, regardless of anything else. I usually do an hour and a half, every other day. I used to do more. It’s worth it, but takes self discipline. As far as fatty foods, don’t buy them.
When I was transitioning into a teenager, I stopped even going down the “toy isles.” I view junk food, in the same manner. I wouldn’t buy a toy, or a carton of iced cream. If you don’t buy it, you can’t be tempted by it.
If you like to “graze,” try some edamame beans, with sea salt. There are several brands available, that you can stick in the microwave oven. Salt, and sugar, are both electrolytes. Salt isn’t good in large quantities either, but you usually don’t consume all the salt, from edamame beans. It’s on the hull, which is indigestible.
I love boiled peanuts too. If you are in the American South, they are available, almost anywhere, and in a variety of flavors. I prefer cajun.
Wasabi peas, aren’t that bad either, and they’re great at clearing your sinuses out.
Chewing gum, can be good too. Get the stuff that has xylitol, instead of sugar. Just keep it away from any pets, especially dogs…